MS2009 Installation Guide ENG

8/2/2019 MS2009 Installation Guide ENG

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Installation GuideInstallationsanleitung

Guide d' installation

Gua de InstalacinGuida all'installazione

Installatiehandleiding

Installationsguide


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2

English ......................................................................................................2

Deutsch ..................................................................................................14

Franais ..................................................................................................26

Espaol...................................................................................................38

Italiano ....................................................................................................50

Nederlands .............................................................................................62

Svenska ..................................................................................................74

..................................................................................................86

Technical specifications ..............................................................................3

Introduction.................................................................................................3

Unpacking...................................................................................................4

Floor spikes ................................................................................................4

Positioning ..................................................................................................4

Top panel controls ......................................................................................5

Display ........................................................................................................5

Bottom panel ..............................................................................................6

Connections................................................................................................6

Remote control/SPL meter.........................................................................8

Operating instruct ions ................................................................................8

Menu system ..............................................................................................9

Factory reset.............................................................................................10

Acoustic set-up procedure.......................................................................11

SPL measurement graph..........................................................................13

Contents

For additional help with installation visit:

Weitere Hinweise zur Installation finden Sie unter:

Pour de l'aide supplmentaire concernant l'installation, visitez le site:

Para obtener ayuda adicional sobre la instalacin visite:

Per ulteriori consigli a proposito dell'installazione, visitate il sito:

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Ga, voor extra ondersteuning bij de installatie, naar:

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Min Sensitivity

Max input (Line/LFE)

Max input (Speaker In)

Input impedance (Line/LFE)

Input impedance (Speaker In)

Frequency response

Drive units

Crossover

Amplifier power

Max power consumption

Standby consumption

Magnetic shielding

Speaker dimensions (H x W x D)

Weight

3

Thank you for purchasing this Mordaunt-Short product. The Mezzo 9

subwoofer features a new sophisticated Digital Signal Processor (DSP)

preamplifier that allows many adjustments to be made to get the best

possible performance whatever your programme choice, main speaker

system, or listening environment.

The adjustable and pre-settable level, low pass filter slopes and

continuously variable phase allow the Mezzo 9 to be matched to a wide

range of speaker systems. Twin adjustable notch/boost filters allow room

anomalies to be tuned out and a dynamics processing engine allows

either enhancement of dynamics for a more punchy movie experience orcompression/downward expansion for late night use.

A high efficiency 375 watt amplifier coupled to two 8 CPC bass drivers

allow the Mezzo 9 to recreate the bass depth required for both realistic

Music and Movie performances. Separate presets may used to allowing

you to quickly recall your own settings optimised for different listening

requirements.

Finally a combined remote cont rol / Sound Pressure Level meter has been

designed to make setting up the Mezzo 9 simpler and more accurate.

Please do read this guide carefully, as it contains essential information in

getting the very best from your new subwoofer.

Matthew Bramble,

Mordaunt-Short Technical Director

and the Mezzo 9 design team.

IntroductionTechnical specifications

275 mV rms required for maximumoutput with Volume at max.

2 V rms

28 V rms

10k Ohms

120k Ohms

30Hz - 200Hz

2 x 8" aluminiumCPC long throw woofers

Active/variable

375W rms

600W

8W

Yes

315 x 338 x 350mm(12.4 x 13.3 x 13.8")

21.1kg (46.4lbs)

Mezzo 9


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4

1. Unpacking

Follow the diagrams to carefully unpack your subwoofer. It is quite heavy

and it is advisable to have a friend help with unpacking and moving the

unit.

kg

RANGE

1dB

2dB

RELATIVESPL(dB)

+18

+14

+16

+12

+10

+8

+6

+4

REF

-4

-2

-6

-8

-10

-12

-14

+9

+7

+8

+6

+5

+4

+3

+2

REF

-2

-1

-3

-4

-5

-6

-7

+2

+1

G AMES

F LA T

ME NU

S P L

MU S I C

MOV I E

N I G H T

2. Floor spike

Attach the feet to the Mezzo 9 as shown in the diagram. It is

recommended to use the metal spikes for carpeted flooring and the

rubber feet for hard flooring or where the spikes might damage the

flooring type.

Metal spikes Rubber feet

3. Positioning

See diagrams for some typical set-ups in 5.1/6.1 and 7.1 surround-sound

configurations. Your subwoofer can be placed almost anywhere in the

room as bass is much less directional than higher frequency sound.

However, due to the acoustic effects of the room, experimentation is

always recommended. In particular before setting adjustments forroom anomalies such as the Notch Filters try to achieve the best

performance by changing the position of the subwoofer first. Remember

to adjust only a little at a time and to make only one change between

listening tests.

Note: For surround-sound use always ensure the correct distances/time

delays are entered in the "Loudspeaker Set-Up" page of your homecinema receiver (refer to your home cinema receiver manual for more

information) before making any adjustments.

6.1 7.15.1

Contents:

x 4 x 4 x 4 x3


5/14

5

Save/Recall

Press the button to recall a previously saved setting (i.e. Preset). Press and

hold down the button to save the current set-up.

Back

Press to return to a previous menu item/function.

Infra-red sensorReceives IR commands from the supplied remote control. A clear

unobstructed line of sight between the remote control and the sensor is

required.

Clip

Flashes when the input to the subwoofer DSP circuitry starts to clip or

overdrive which will degrade the sound and more importantly could

damage the subwoofer/bass drivers. If this happens turn the volume down

on your connected receiver/ amplifier, rather than or the subwoofer itself,

this reduces the level at the subwoofer input rather than the output level.

4. Top panel controls

1

1

2

3

4

5

6

7

2

3

4

5. Display

Notch/Boost filter 1 and 2 active.

Numeric display for volume etc.

Text display.

Refer to later sections of this manual for more information about these

adjustments and functions.

1

2

3

3

1 542

6

Power

Lights up bright when the subwoofer is switched "On" and dim when in

standby mode.

Selector

Rotate the dial to cycle through the menu item/function.

EnterPress to accept the item/funct ion highlighted in the display menu. Also

press to turn "On" when in standby mode and press and hold to put into

standby mode.

5

6

7

Units for numeric value.Low pass slope.

Phase filter active.

45

6


6/14

Note: Before making any connections, make sure that the subwoofer andamplifier are switched "OFF".

The Mezzo 9 can be used in two basic configurations:

1. With an amplifier without a dedicated filtered Subwoofer output.

2. With an amplifier (such as a home c inema receiver) which does have adedicated filtered Subwoofer output.

In fact if required it is possible to make both connections at the same timeand switch between them (see details later).

Amplifiers without a dedicated Subwoofer output:

For this configuration there are two options, either you can connect theMezzo 9 to the amplifiers preamp output or its speaker outputs (theMezzo 9 uses whichever you choose automatically). In both cases theMezzo 9 then performs the required low-pass filtering and summing tomono internally to create a subwoofer channel. See below:

Option 1

Option 2

A high quality stereo phono/RCA cable is the preferred connection type,use the high-level connection option below only if your amplifier does notfeature pre-amp outputs.

In this case, use speaker cable or other wire. The Mezzo 9 presents a highinput impedance to the amplifier and is wired in parallel with the mainspeakers. The Mezzo 9 will not draw any significant current from theamplifier and so a large gauge speaker cable is not required, small gaugecable can be used, and as the amplifiers output impedance will normallybe very low screened cable is not required.

7. Connections

HIGHLEVELIN

LEFT

RIGHT

2-channel connections

Pre-amp output

HIGH

LEVEL

IN

LEFT

RIGHT

High Level In

Amplifier

Loudspeaker Loudspeaker

6. Bottom panel

Line In L/RPhono/RCA cables can be connected here from an amplifiers line levelPreamp / Subwoofer output.

Line Out L/R

Phono/RCA cables can be connected here to loop the Line In signalonwards to another Subwoofer.

LFE (Low Frequency Effects)In - Single phono cable can be connected here from a home cinemareceivers LFE/Subwoofer output.

Out - Single phono cable can be connected here to loop the LFE In signalonwards to another Subwoofer.

TriggerIn - Single cable can be connected here from a device that has a Triggeroutput. A 5-12V DC trigger input will wake the Subwoofer up fromStandby.

Out - Single cable can be connected here to loop the Trigger In signal toanother device.

1

2

3

4

High Level Input L/RSpeaker cable or other wire can be connected here from an amplifiers highlevel loudspeaker terminals. The Mezzo 9 presents a high input impedanceto the amplifier and can be wired in parallel with the main speakers.The Mezzo 9 will no draw any significant current from the amplifier and so

a large gauge speaker cable is not required.

Mains Voltage Selector SwitchSwitches the mains voltage between 115V and 230V. For use by installer/dealer only.

Power On/OffSwitches the subwoofer on and off.

AC power socketOnce you have completed all the connections to the subwoofer, plug theAC power cable into an appropriate mains socket then switch on. Yoursubwoofer is now ready for use.

5

6

7

8

HIGH

LEVELIN

LEFT

RIGHT

115V:6.3AL 250V230V:3.15AL 250V

ATTENTIONAFIN D'ASSURERUNE PRETECTIONPERMANENTE CONTRELES R ISQUESD'INCENDIE,REMPLACE-RUNIQUEMENTPARUNFUSIBLEDE INDIQU

CAUTIONFOR CONTINUED

PROTECTIONAGAINST FIRE

HAZARD,REPLACEONLY WITH

SPECIFIED FUSE

OFF

ON

POWER AC

230V

115V

Designed inLondon, England

Caution:Serial NumberLabel Removed

Max pow er c onsumption: 600W

Active Subwoofer

CautionRiskof electricshock.

Do not open.

AvisRisquedechoc electrique.

Nepasouvrir.

AchtungVorm ffnen desgertes.

Netzstecker ziehen.

N2409 A46

Mains VoltageSelectorSwitch

115V/230VAC ~ 50/60Hz

6/3A

Thisdevicecomplieswith part 15 of the FCC Rules.Operati oni ssubject to thefollowingtwo conditions:(1)Thi s devicemaynot causeharmful interference,and (2)this devicemust

accept anyinterference,including interferencethat maycauseundesired operation.

www.mordaunt- short.com

HIGH

LEVEL

IN

LEFT

RIGHT

115V:6.3AL 250V

230V:3.15AL 250V

ATTENTIONAFIND'ASSURERUNE PRETECTIONPERMANENTE CONTRELES RISQUESD'INCENDIE,REMPLACE-RUNIQUEMENTPAR UNFUSIBLEDE INDIQU

CAUTIONFOR CONTINUED

PROTECTIONAGAINST FIRE

HAZARD,REPLACEONLY WITH

SPECIFIED FUSE

OFF

ON

POWER AC

230V

115V

:

CautionRisk of electric shock.

Do not open.

AvisRisquede choc electrique.

Nepas ouvrir.

AchtungVorm ffnen des gertes.

Netzsteckerziehen.

A46

Mains VoltageSelector Switch

115V/230VAC ~ 50/60Hz

6/3A

v . er at io n issubject to thefollowing: v in te r fe r ence,and ( 2) t h is devicemust

, e that may causeundesired operation.

1 2 3 4

5

6 7

8

6


7/14

Amplifiers with a dedicated Subwoofer output:

Connect the "LFE" or "Sub" output on your home cinema receiver. to the

LFE In socket of the Mezzo 9 subwoofer using a high quality mono

phono/RCA cable. When this input is used the low pass filter in the

subwoofer is deactivated, all other adjustments for level, phase, etc. are

still available.

Chaining multiple subwoofers

It is possible to chain multiple Mezzo 9 subwoofers whichever connection

type you are using.

If using the Line Inputs connect the "Line Out" output of Mezzo 9

subwoofer to the "Line In" sockets on your other subwoofer with a Stereo

Phono/RCA lead.

If using the LFE Input connect the "LFE Out" output of Mezzo 9 subwoofer

to "LFE In" sockets on your other subwoofer with a mono Phono/RCA

lead.

7

FrontRight

FrontLeft

SurroundLeft

SurroundBackLeft/

SurroundBackCentre

SurroundRight

SurroundBackRight

ControlBus

In

Out

DVD

SR

SBR

SW

L

SL

SBL/SB

Y

Cb/Pb

Cr/Pr

Y

Cb/Pb

Cr/Pr

Y

Cb/Pb

Cr/Pr

Y

Cb/Pb

Cr/Pr

C

7 .1 D ir ec t I n 7 .1 P re am pO ut

SerialNo.labelfittedonunderside

R

SR

SBR

L

SL

SBL/SB

CR

TV/MonOut Video 1

SpeakerImpedance4-8Ohms

PowerAC

Power

On

Off

7.1 6.1 5.1

SW

Compo

nent

Recorder1

HIGHLEVEL IN

LEFT

RIGHT

Home cinema connections

LFE or Sub out

If using High Level In, connect another set of cables from the Left and

Right High Level Inputs of the Mezzo 9 to the Left and Right High Level

Inputs of the next subwoofer. Alternatively connect another set of cables

from the amplifier outputs to the Left and Right High Level Inputs of the

next subwoofer. In either case the subwoofer inputs are simply in parallel

to each other and in parallel to the main speakers.

or:

Trigger In / Out

The Mezzo 9 features a trigger input that allows its power status to be

remotely controlled by a home cinema receiver or other unit that has a

trigger output. The trigger input is positive edge triggered, inputting

5-12V DC to "Trigger In" will turn the unit On, removing the trigger voltage

will put the unit into Standby. A trigger output allows the signal to be

looped on to further units if desired. See later section for full details.

Note: The Trigger Input feature is disabled in Automatic power mode, see

later sections for details.

HIGHLEVEL IN

LEFT

RIGHT

HIGHLEVEL IN

LEFT

RIGHT

Line Out output Line In input

HIGHLEVEL IN

LEFT

RIGHT

HIGHLEVEL IN

LEFT

RIGHT

LFE Out output LFE In input

LFE or Sub out

HIGHLEVELIN

LEFT

RIGHT

HIGHLEVELIN

LEFT

RIGHT

HIGH

LEVELIN

LEFT

RIGHT

HIGH

LEVELIN

LEFT

RIGHT

Trigger Out output Trigger In input

12V Trigger output

Pre-amp output

High Level In

Amplifier


HIGH

LEVELIN

LEFT

RIGHT

HIGH

LEVELIN

LEFT

RIGHT

High Level In

Amplifier



8/14

8

9. Operating instructions8. Remote control/SPL meter

The custom-made user interface on top of the Mezzo 9 subwoofer shows

the current status and allows you to set-up the DSP features.

Enter / Set-up

Press to enter set-up menu and accept changes. This action is

represented by the symbol.

Control wheel

Use to adjust volume / settings and cycle through menu items. This action

is represented by the symbol.

Presets/Save presets

The Mezzo 9 has the ability to save 3 presets: Music, Movies, and Games.

The three presets can contain completely different settings for level,

crossover frequency, input, notch filtering, dynamics etc.

Setting a preset is simply a matter of setting your desired adjustments,

then pressing and holding the Presets button for 3 seconds. The Mezzo 9

will ask which of the 3 presets you wish to save the current adjustments

in. Rotating the Control Wheel moves to the next preset. Press enter when

you have the right preset or press Back (or wait a few seconds) to cancel.

To recall a preset simply press the Presets button, each time the

button is pushed the Mezzo 9 cycles to the next one.

Back

To go back to a previous item or functions. This action is represented by

the symbol.

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The Remote Control / SPL Meter supplied with the Mezzo 9 is included to

aid the set-up and in particular the setting of the Notch/Boost Filters if

required. It may also be used to correctly set-up satellite speaker levels

when used in conjunction with an AV receiver.

SPL

Press to activate SPL meter. Press andhold to change range from 1dB (fine

measurements) to 2dB (coarser

measurements, recommended for initial

set-up).

Back

Press to exit current menu selection and

return to volume control.

Standby

Press to put the subwoofer in and out of

standby.

Navigation

Press to navigate through menus aswith control wheel on top of subwoofer.

Menu

Press to enter set-up menu and to make

selections within menu structure.

Night

Press to turn night modes on and off.

Source

Press to choose between the LFE and

Line / High Level inputs.

CompareWhen this button is pressed,

Notch/Boost, Phase and Dynamics are

deactivated, press again to reactivate

features. Use this function to compare

response of subwoofer with and without

DSP features.

Movie / Music /

Games

Press these buttons to choose between

the saved presets.

See the "Acoustic set-up procedure" section of this manual for moreinformation.


9/14

9

10. Menu system

Volume

The default state of the subwoofer is volume control mode. In this state,

turning the control wheel changes its volume.

Set-up menu

To enter the set-up menus, press the control wheel:

The first menu item (which is Source) will be displayed.

Turn the control wheel to cycle through the other set-up menu options:

Once you have selected the desired menu, press the control wheel again

to enter that menu. Now turn the control wheel to display the relevant

parameter/options:

When the parameter/option you desire is displayed, press the control

wheel to accept the changes, an asterix (*) will show the active setting:

You can continue to cycle through the menu options by repeatedly

pressing the control wheel. If you wish to adjust a parameter that you have

just entered, keep pressing the control wheel until the desired parameter

is displayed again.

Press the back button at any time to return to the previous menu.

Pressing Back a few times will always return you to the top volume

control mode:

Source

Use this menu to select the source input to be used.

The menu structure is as follows:

LINE / HILVL - Select for left, right line level and high level speaker inputs.

LFE - Select for LFE channel only.

LFE / LINE / HILVL - Selects both inputs at the same time (you will now

need to control which one you are using by turning on/off the two sourcecomponents).

Low pass

The Low pass filter is the filter that removes all of the high frequencies

from the signal before it reaches the amplifier. When this filter is set

correctly, the subwoofer will blend in with the other speakers in your

system, and the entire system will sound naturally balanced.


See "Acoustic set-up procedure" for more details on setting the Low Pass

filter.

Filter 1 & 2


Each of these filters can be selected as a Notch or a Boost filter.

Notch/Boost filter - The response of a speaker in any room may have

peaks or dips that are created by acoustic reflections. The dimensions of

the room and the acoustic properties of the surfaces within the room

determine the location and size of the peaks. The notch/boost filters can

be used to cancel out these peaks to a large extent.

See "Acoustic set-up procedure" for more details on setting up the notch

filter.

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LINE / HILVL

LFE

LFE / LINE / HILVL

Slope

Frequency

Off

Notch

Frequency

Depth

Width

Boost

Frequency

Height

Source Low pass

LCDBrightness

Volume

Scale

Filter 1 Filter 2

Phase

DynamicsPowerModes

The set-up menu order is as follows:


10/14

10

10. Menu system (continued)

Power mode

The power mode select how and when the subwoofer will come in and out

of standby mode.


Auto - The subwoofer will automatically come out of standby when anaudio signal is sensed at the inputs, and it will go back into standby when

there has been no signal for a period of 5 minutes. Note the Trigger Input

is disabled in Auto Mode.

Manual - The subwoofer will come out of standby when the control wheel

is pressed. To go back into standby, press and hold the control wheel.

Alternatively the subwoofer will respond to the Trigger Input if present.

LCD brightness

This menu allows you to select the brightness settings of the LCD display.


Volume scale

This menu selects the form in which the volume is displayed.

The Volume scale menu structure is as follows:

Decibels - In decibels mode, the volume scale will range from a minimum

of -90dB to a maximum of 0dB (i.e. volume is shown as a minus number

of decibels below the maximum setting).Linear - In linear mode, the volume scale will range from a minimum of 0

to a maximum of 90 (i.e. arbitrary units with 0=no volume and

90=maximum).

11. Factory Reset

If you wish to return to the Factory Presets, turn the mains power switch

"Off" (refer to previous section of this manual "Bottom panel"), press and

hold the Preset button and the Back button together, keep

holding the buttons down while turning the mains power switch on.

LCD Bright

LCD DimLCD Off

Decibels

Linear

Phase


A key factor in the performance of a subwoofer is integration with the full

range speakers, i.e. how well the subwoofer blends in with the rest of the

system. The main left and right speakers and subwoofer do not always

sum together as well they should because as well as simple level

differences, differing distances from the listening position, different

amounts of delay through electronics, and differences in the phase

response of the speakers themselves can have a major effect.

Traditionally, subwoofers have used a phase invert or polarity switch to

help achieve better integration. We have taken this concept a step further

with our Phase Compensation Filter. This filter allows the user to increase

the phase offset continuously in degrees until the optimal integration has

been achieved.

The unit "degrees" refers to the number of degrees the phase of the

subwoofer response is being shifted at its low pass filter frequency.

Note: In the case of the LFE channel where no low pass filter is applied,

the number of degrees displayed refers to the shift taking place at 80Hz.

See the "Acoustic set-up procedure" section of this manual for more

information on setting up the phase compensation filter.

Dynamics


The term dynamics refers to how the unit responds to quiet and loud

sounds. In normal operation a subwoofer would provide the same gain to

both quiet and loud sounds. In the Mezzo 9, however, by controlling the

dynamics of the unit in our DSP preamp, we can vary the gain in sympathy

with the loudness of the sound in a couple of ways to provide a more

desirable audio response for different listening applications.

The Mezzo 9 subwoofer has two different dynamics styles with three

settings each:

Night 1/2/3 - This setting helps to expand and make more noticeable quiet

signals (using what is called downward expansion) while also reducing the

level of the loud signals (using what is called compression). The Night

modes are designed to both improve the intelligibility of bass soundtrackswhen listening quietly late at night and to reduce the bangs and booms so

that you dont disturb the neighbours for instance but can still hear all the

effects well. Three night modes are available with 1 being the least and 3

the strongest effect.

Enhancement 1/2/3 - This setting enhances and boosts the dynamic

range of the bass soundtrack for more impact (using expansion) whilst

controlling the very loud signals (using limiting) to protect the speaker from

being overdriven. Three enhancement modes are available with 1 being

the least and 3 the strongest effect.

Off

On

Phase shift

Off

Night 1

Night 2

Night 3

Enhance 1

Enhance 2

Enhance 3

Auto

Manual


11/14

11

12. Acoustic set-up procedure

Set up Overview

There are three areas that are covered by this setup routine: notch/boost

filters, low pass filter, and phase compensation filter. The notch and boost

filters in the Mezzo 9 subwoofer are designed to cancel out the peaks and

dips in frequency response that are caused by room acoustics. The low

pass filter rolls off the high frequencies and provides integration with the

full range speakers. The phase compensation filter helps the subwoofer

and the full range speaker sum together correctly. The following setup

routine helps you to measure the frequency response of the subwoofer in

your room, and then apply the correct filters to give you the most accurateresponse.

The idea is to measure the frequency response of the subwoofer in your

room at your actual listening position and then apply any required

equalisation to make it as flat as possible. Then adjust the crossover

slope and phase as necessary to join the frequency response of the

subwoofer to that of you main speakers as smoothly as possible.

Fully read through the How it works sections for Notch/Boost, Low Pass

Filter and Phase Compensation below before starting to make any

changes or attempting the Acoustic Setup procedure. These give an

overview of the setup process, why it is necessary and what it can

achieve.

Set-up CD

The setup CD contains 17 tracks of test signals. Track 1 is wide band

noise that allows you to set your subwoofer to a reference level. Tracks

2-16 are narrow band modulated tones that allow you to measure the

level of the subwoofer in small frequency steps ranging from 30Hz to

100Hz and create a frequency response graph. The 17th track is a special

test tone for setting up the phase filter. Also on the CD is a PC application

that helps you set the Notch/Boos Filter.

The CD is used with the "Acoustic setup procedure". See later section.

How It Works

Notch/Boost

A typical subwoofer response in a room may look something like Figure 1

below.

As you can see in this example there is a peak at 80Hz (B) and a slightdeficiency at 35Hz (A).

To correct these issues, a notch filter would be applied at 80Hz and a

boost at 35Hz. After these corrections have been made, the net result

would hopefully be a response much closer to that shown in figure 2

below:

Low Pass

Next we need to join the subwoofers response to that of the main

speakers.

The low pass filter adjustment sets the crossover point and slope of the

filter that prevents high frequencies going to the Sub and this joins itsresponse to that of the main speakers.

The frequency of this point can be moved up or down for best fit for your

loudspeakers and its slope adjusted to best match the natural rolloff of the

low frequency response of the main speakers.

If the Low Pass Filter is set too high the Subwoofer and main speaker

responses can overlap too much and create an unwanted hump in the

overall response.

Conversely, if the Low Pass Filter is set too low (see diagram 1) the

Subwoofer and main speakers responses might not join properly and

create an unwanted dip in the overall response.

Frequency (Hz)

Level(dB)

Figure 1

Figure 2

10 100

A

B

1K 10K

Frequency (Hz)

10 100

A

B

1K 10K

Level

(dB)

Level(dB)

10 100 1K 10K

Level(dB)

=

10 100 1K 10K

Level(dB)

10 100 1K 10K

Level(dB)

=

10 100 1K 10K

Level(dB)

Variable crossover point

Sub Full range

12dB/Oct low pass slope

Large overlap

24dB/Oct low pass slope

Large gap

Diagram 1


12/14

12

12. Acoustic set-up procedure (continued)

Phase Compensation

In any speaker system there will always be inherent phases shifts between

of the main speakers and subwoofer at the crossover point. These are

caused by the actions of the crossovers and the response characteristics

of the speaker systems themselves.

Because of this it is normal to find that the responses dont add together

accurately as might be expected and some cancellation can instead take

place at the crossover region.

The effect can be similar to when the crossover of the subwoofer is set toolow and a hole appears in the overall response as below, although less

pronounced.

The Mezzo 9 features variable phase that allows you to adjust the phase

until the subwoofer and main speaker outputs are in phase at the

crossover region and the two responses sum evenly.

Performing the acoustic set-up

A. Notch filter

Make sure all filters in the sub are turned off (low pass, filter 1, filter 2,

phase) the first time you perform this setup routine (if desired, perform

a factory reset as previously described to reset all parameters).

1. Disable all speakers in your system except the subwoofer by

disconnecting one of either + or - leads at the back of each speaker:

2. Load the supplied set-up CD:

3. Sit in the listening position and set the SPL meter to 2dB range:

4. Play track 1 (wide band noise), adjust the amplifier volume until the

SPL REF LED is lit green:

5. Play the rest of the tracks one by one, noting the readings for each

track. Plot your frequency response or a copy of the supplied graph.

6. If the response looks like it needs equalisation by a notch/boost filter

you can calculate the best notch filter settings, using the set-up

application supplied on the Mezzo 9 set-up CD or by visually

inspecting the graph. To use the CD simply load it into your computer

and follow the on-screen instructions:

To set up the notch filter by hand:

a) Find the track with the highest reading and set the notch filter

frequency to this value.

b) Set the depth to the value that best cancels the peak.

c) Set the width to the narrowest setting (1).

d) Repeat step 5.

e) If peaks are measured on either side of the track located in a), set

the width to medium (2) and repeat d).

7. If there is another peak in the response after applying notch filter 1,

this peak can be addressed with notch filter 2. Follow the above steps

1 through 7 to set this filter. Additionally, if there is a dip in theresponse of the sub, try setting the second filter to a boost filter at the

frequency of the dip to give a flatter overall response.

B. Low Pass

1. If you are using the LFE input, there is no need to set the low pass

filter. The low pass is usually implemented in the AV receiver. However

if your AV receiver features an adjustable crossover frequency you

may wish to adjust that (consult your AV Receivers manual) and use

the Mezzo 9s SPL meter and test disc to confirm the response in the

same way as you would if you were adjusting the Mezzo 9s own

crossover.

2. Re-connect your main speakers and set the crossover to a sensible

starting position.

As a guide for setting the low pass filter here are some typical settingsfor different types of speakers to start with:

Tower: 35Hz 50Hz

Bookshelf: 50Hz 65Hz

Satellite/mini: 80Hz - 120Hz

3. Now re-measure the frequency response of your system at the

listening position. In particular pay attention to the response where the

main and subwoofer responses meet (usually around 80-120Hz).

Adjust the crossover frequency to achieve the flattest response.

The sets areference

level

Level(dB)

10 100 1K 10K

Level(dB)

=

10 100 1K 10K

Level(dB)

10 100 1K 10K

Level(dB)

=

10 100 1K 10K

Ideal match

but phase issue causes dip


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C. Phase compensation filter

1. Enable all speakers in your system.

2. Load supplied set-up CD.

3. Sit in the listening position and play the last track on the CD (17).

You may want to put the track on repeat to give you enough time to

complete the phase set-up.

4. Turn on SPL meter on 1dB range.

5. Adjust the volume on your amplifier or receiver until the SPL REF ledis lit green.

6. Adjust the phase filter by steps until the maximum level measured by

the SPL meter is achieved.

7. Play some well known source material and continue to adjust the

phase filter for the best overall sound.

13

13. SPL measurement graph

Use Your Ears

Following the setup procedure is only the first step in getting the most out

of your Mezzo 9 subwoofer. Listen to some well known source material.

Use the compare button on the remote control to listen to the sub with and

without the filters in place.

Note: Dont forget to save your settings in a preset once you are finished

so that you dont lose them when the power is turned off.

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Level(relative

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PL)

Frequency (Hz)

CD Track

2

Track

3

Track

4

Track

5

Track

6

Track

7

Track

8

Track

9

Track

10

Track

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Track

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Track

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www.mordaunt-short.comMordaunt-Short and Mezzo are registered trademarks of Mordaunt-Short Ltd. All rights reserved. 2007 Mordaunt-Short Ltd.

Registered Office: Gallery Court, Pilgrimage Street London SE1 4LL England.

AP21199/1

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1817161514131211109876

543210

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Level(relative

dBS

PL)

Frequency (Hz)

CD Track

2

Track

3

Track

4

Track

5

Track

6

Track

7

Track

8

Track

9

Track

10

Track

11

Track

12

Track

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Track

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Level(relative

dBS

PL)

Frequency (Hz)

CD Track

2

Track

3

Track

4

Track

5

Track

6

Track

7

Track

8

Track

9

Track

10

Track

11

Track

12

Track

13

Track

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Track

15

Track

16

Documents

MS2009 Installation Guide ENG