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SR 4.500 Amplifier | 880 W total power | 4 x 220 W @ 2ohm | D-class

The Audison SR 4.500 4-channel amplifier with crossover features great power packed into ultra-compact dimensions (130 W x 4 @ 4Ω).
As far as the electronic design is concerned, every aesthetic and functional detail of the Audison SR 4.500 has been taken care of, resulting in a compact amplifier made of extruded aluminum with rounded corners, which facilitates the installation of the product in narrow spaces. Thanks to the generous heat sinks on the two short sides of the amplifiers, there is no need for internal cooling fans, which often cause noise and dust accumulation. In keeping with tradition, the SR amplifiers confirm their vocation for versatility by including on all models a complete filter section, suitable for any kind of audio system configuration. The controls, protected by a satin-finished aluminium panel, are located on the top panel of the amplifier, so that they can be easily reached from above, even after the product has been installed. When the system includes an Audison bit processor, the filter section can be totally excluded.

Amplifier Tech Data

Channels 4
Class D-Class
Hi Level Input Yes
Low Level Input Yes
Digital Input No
Power supply voltage / fuse 11 ÷ 15 VDC / 2 x 25A
Operating power supply voltage 6.5 ÷17 VDC
Idling current 1.7 A
Idling current when off 0.09 mA
Consumption @ 14.4 VDC, 2Ω, Max Musical Power 40 A
Remote OUT 6.5 ÷ 15 VDC (150 mA)
Remote IN 6.5 ÷ 15 VDC (1 mA)
ART - Automatic Remote Turn on/off from OUTPUT BTL speakers (Selectable) 1.5 ÷ 7 VDC

Amplifier Stage

Distortion - THD @ 100 Hz, 4Ω, 70% Rated Power 0.08 %
Bandwidth A 10 Hz ÷ 35 kHz
S/N ratio A 105 dBA
Damping factor A 200
Input sensitivity Pre-In 0.2 ÷ 5 VRMS
Input sensitivity Speaker-In 0.8 ÷ 20 VRMS
Total Power RMS 880 W
Minimum load impedance @4Ch: 2Ω
@ 3Ch: 2Ω + 2Ω + 4Ω
@ 2Ch: 4Ω
Output Power (RMS) @14.4 VDC, 1% THD 4Ch 130 W x 4 (4Ω)

4Ch 220 W x 4 (2Ω)

3Ch 120 W x 2 (4Ω) + 480 W x 1 (4Ω)

3Ch 220 W x 2 (2Ω) + 440 W x 1 (4Ω)

2Ch 450 W x 2 (4Ω)
Adjustable Crossover Yes

CEA Specifications

Output power @ 4Ω, 1% THD+N, 14.4 V Output power @ 4Ω, 1% THD+N, 14.4 V: 125 W x 4 Ch
SN ratio (ref. 1W output) SN ratio (ref. 1W output): 83 dBA


Input Type Pre-In / Speaker-In
Filters Outputs PRE OUT full range (Input A)
Filter Pass A Front Ch Filters - Full Hi-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct.
Filter Pass B Front Ch Filters - Full Lo-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct.
Filter Pass C Rear Ch Filters - Full Hi-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct.
Filter Pass D Rear Ch Filters - Lo-pass: 50 ÷ 3.2k Hz @ 12 dB/Oct
Channel Mono A/B Ch MONO IN (on/off) Yes
Inputs/Outputs Sub CH (-20 ÷ 6) dB
Inputs/Outputs Bass Boost B Ch (0 ÷12) dB


Weight 2.12 kg


SR 4.500
Dimension A 264 mm
Dimension B 234 mm
Dimension C 155 mm
Dimension D 135 mm
Dimension E 47.5 mm


The optional VCR-S2 subwoofer volume control provides the ability to adapt the subwoofer level to any personal preference and favorite music genre. VCR S2 features a bulletproof Molex connector.
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  • Elegant and functional design with rounded corners to minimize space, facilitating installation.
  • Built-in USS (Universal Speakers Simulator).
  • Full built-in crossover section.
  • Optional VCR-S1 remote control offers the possibility to adjust the subwoofer level (-20 / + 6 dB) to your musical preference.
  • Balanced high-level inputs for connecting to the OEM head unit speaker output
  • Low-level RCA for after-market speakers.
  • ART (Automatic Remote On/Off) function.
  • Remote IN / OUT socket to allow control of multiple amplifiers.
  • PRE-OUT allows for system expansion.


Audison D-Class technology

ADT uses a switching frequency twice as fast as many other modern Class D amplifiers using very high-tolerance component parts to keep the timing correct even during temperature extremes. The higher switching frequency of Audison Class D moves noise much farther away from the audible band. Audison Class D amplifiers also use a steeper 4th-order analog lowpass filter, rather than the simpler 2nd-order lowpass filters usually used in competing designs. The steeper filter will keep noise much lower in amplitude – which is good for controlling EMI and preventing infrasonic noise from getting to the tweeters. It also keeps phase shift outside the audible range. The cost is higher – twice as many components are needed for a 4th-order filter compared to the usual 2nd-order filter, and each output channel needs its own filter – but Audison determined through exhaustive listening testing that this design was the best-sounding approach.


The “All Channels Driven” design philosophy guarantees that the Audison amplifier delivers the rated power on all channels simultaneously. To reach that target, Audison designed the amplifier power supply to handle the cumulative power demand.


Maximum versatility thanks to the bridging option for each pair of channels.


Universal Speaker Simulator technology on high-level inputs for maximum compatibility with any type of Head-Unit OEM Source.

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