Eight Channel Amplifier

The Acoustic Technologies QDC42.dsp is an elegantly designed eight channel audio amplifier featuring extensive fully integrated digital signal processing systems on board. The QDC42’s amplifiers produce 40 Watts into 4 Ohm Loads, are highly linear, unconditionally stable and feature extensive on-chip thermal management & protection circuitry.

The DSPB23 Digital Signal Processing System (DSP) offers comprehensive audio processing capabilities. Fully featured Equalisation, Crossover, Gain, Delay and Dynamics Controls are provided. A PC based graphical user interface provides a familiar DSP programming environment.

The QDC42.dsp is a highly refined system building block, intended for use in professional audio applications including :
* Courts of Law
* Public Transportation Terminals such as:

    Bus Terminals &
    Railway Stations
* Parliamentary Debating Chambers
* Luxury Home Audio Distribution Systems
* Supermarkets, Shopping Centres
* Conference Centres
* Corporate Board Rooms

Such systems will generally employ multiple amplifiers within the overall system. With this in mind the QDC42 is convection cooled, eliminating the noise, maintenance and reliability issues associated with in-built cooling fans.

In Summary: The QDC42.dsp integrated digital system processor amplifier offers superb audio performance with extensive configuration capabilities in a footprint specifically engineered to meet the complex requirements encountered within large scale installations.

Download hi-res image: Front
Download hi-res image: Rear
Download QDC42.dsp Information Sheet
Download QDC42.dsp Owners Manual

Acoustic Technologies DSPB23 Graphical User Interface Software provides complete control of the DSP System embedded within the QDC42.dsp Multi Channel Amplifier.
CLICK HERE for more information and to download the DSPB23 GUI Software


Number of Channels 4 Input Channels - 8 Output Channels
Output Power per Channel (See Note 1) 25 Watts RMS @ 1kHz - 8 Ohms
40 Watts RMS @ 1kHz - 4 Ohms
Frequency Response (See Note 2) 10 Hz - 22 kHz +0dB, -3 dB
Input Sensitivity 0.755 Volts RMS for 25 Watts into 8 Ohms
Input Program Impedance 16k Ohms Balanced
Load Impedance 4 Ohms to 16 Ohms
Damping Factor Greater than 100:1 (Referenced to 8Ohms @ 1 kHz)
Signal to Noise Ratio (SNR) Greater then 85dB
Audio Input Connector Phoenix Style Screw Terminal Plug (Supplied)
Audio Output Connector Phoenix Style Screw Terminal Plug (Supplied)
Mains Connector and Fuse IES Mains Inlet / Fuse Holder
3 Amp M205 Ceramic Fuse
RS232 Programming Connector Female DB9
User Interface 16 Character x 2 Line LCD Display with Backlight
Recessed Push Button for Menu Selection
Custom Software for DSP Programming
Power Requirements 240 Volts AC @ 2 Amps
Dimensions Standard 19" x 3.5" (2RU) Rack Mount
345mm Deep excluding connectors
Weight 11.2 Kg Net
13.2 Kg Shipping
Specifications - Digital Signal Processing
Number of DSPB23 Systems 4x Dual Channel Processors
Sample Rate 48kHz - 256 x Oversampling
Word Size 24 Bit
Internal Processing 48 Bits double precision floating point
Latency 0.833 mSec
Dynamic Range 105dB
Functions - DSPB23 System
Parametric Equalisation 7x PEQ's/Channel - 2nd Order Response
Parametric Constant Q, Parametric Adaptive Q,
Lo & Hi Shelf, LP Butterworth, HP Butterworth, Band Pass,
Stop Band, All Pass 1, All Pass 2, Low Pass Q, High Pass Q,
IIR Coefficients, Bypass
Crossover 1x LPF + 1x HPF - 2nd Order Response
Butterworth, Linkwitz-Riley, Bessel, Bypass
Can be configured to provide 1x LPF or 1x HPF 4th Order
Gain Channel Gain, Phase Invert and Mute
Output Delay 0.00mSecs - 3.42mSec
in 0.02mSec Increments / Channel
Dynamics Compression or Limiting and Noise Gate / Channel
Threshold / Limit Ratio, Knee & Noise Gate Level
User Interface Graphical User Interface Software for a PC or Laptop providing on-screen control panels for all DSPB23 Functions.

1) All power measurements are conducted according to the IHF202A Standard
2) Frequency response limits are determined by the DSP Sample Rate.

Acoustic Technologies reserve the right to alter or amend the QDC42.dsp, without prior warning in the interests of product improvement.