DA Series Models DA-250FH: 4x 250W (70V/100V) DA-250F: 4x 250W
(4 ohm)
Slide 6
DA Series Models DA-250FH 4x 250W (70V/100V) 2x 500W bridged
mode (140V) *120VAC Version only Limiter
Slide 7
DA Series Models DA-250F 4x 250W (4 ohms) / 170W (8 ohms) 2x
500W bridged mode (8 ohms) Limiter
Slide 8
DA Series Four 250 Watt amplifier channels in one rack
space!
Slide 9
DA Series Features Class D design 85% efficient! 60% lower
power consumption than conventional amplifiers Compact, single
rack-space design Stack up to 5 units without open spaces between
units Lightweight 6.6kg (14.6 lbs.) 120VAC version 6.8kg (15.0
lbs.) 220-240VAC version Independent power supply for each
channel
Slide 10
DA Series Features Low heat dissipation Recessed stepped
attenuators Comprehensive protection circuitry Removable dust
filters for easy maintenance Optional 250W output transformer,
model MT- 250H
Slide 11
DA Series Front Panel Channel #1 Channel #2Channel #3 Channel
#4
Slide 12
DA Series Front Panel Recessed stepped attenuators Input,
Output, Peak and Protect indicators Power On/Off Removable Dust
Filter
Slide 13
DA Series Rear Panel Removable AC connection Power amplifier
outputs w/ protective cover plate Balanced inputs (+4/-10 dBu)
Slide 14
DA Series Input Section CH1 to All Switch Bridge 2 Switch
Bridge 1 Switch
Slide 15
DA Series Power Supply Separate power supply on each amplifier
channel!
Slide 16
Stack up to five units! Twenty amplifier channels in only five
rack spaces! Rack Mounting
Slide 17
Class D Advantages High power efficiency Smaller heat sink and
power supply Less heat Increased reliability
Slide 18
Digital Amplifiers
Slide 19
DA-250FH: Block Diagram 120VAC version
Slide 20
DA-250F: Block Diagram
Slide 21
MT-250 Matching Transformer Low frequency response down to
30Hz! Up to 250W
Slide 22
Technical Fields
Slide 23
Working Outline Class-ABClass-D
Slide 24
The method of Class-D Amplification Class-D Amplifier changes
input signals into digital pulse signals in PWM and then amplifies
it. Output signals are also come out as digital pulses, and audio
signals are extracted by using LPF. Class-AB amplifier linearly
amplifies input signals. A waveform amplified does not change after
amplification. Amp Input signal Output signal PWM Input signal
AmpLPF Output signal Digital pulse Output signal