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AF companion amplifiers are designed to add powerful amplifier channels to AF bit processor amplifiers. A plug-and-play signal input harness is included to make connection to AF bit amplifiers straightforward. AF companion amplifiers are also perfect for use with systems controlled and managed by a standalone bit processor, such as a bit One HD Virtuoso. AF companions have a “straight wire” architecture, without analog preamp functions such as crossover filtering, and are intended for use with external processors. AF M4D boasts four high-fidelity amplified channels 160W x 4 @4Ω*, 260W x 4 @2Ω* with the audiophile sound of the latest generation Audison D-Class technology. Higher switching frequencies, steeper filtering, and higher-tolerance components deliver sound above and beyond the expectation of Class D – in an amazingly compact package! The audio band is extended up to 40 kHz earning the coveted High-Resolution certification. Bridging channel pairs results in 520W x 2 @4Ω*, guaranteeing flexible and powerful performance. *Output Continuous Power (RMS) @14.4 VDC, 1% THD, all channels driven.



Efficiency83 %
Hi Level InputYes
Low Level InputYes
Digital InputNo
Power supply voltage / fuse11 ÷ 15 VDC
Operating power supply voltage6.5 ÷ 17.5 VDC
Idling current1.12 A
Idling current when off0.007 mA
Consumption @ 14.4 VDC, 2Ω, Max Musical Power47 A
Remote OUT6.5 ÷15 VDC (150 mA)
Remote IN4 ÷15 VDC (1 mA)
ART - Automatic Remote Turn on/off from OUTPUT BTL speakers (Selectable)1.5 VDC



Distortion - THD @ 100 Hz, 4Ω, 70% Rated Power0.05%
Bandwidth A(-3 dB, 2 VRMS, 4 Ω): 10 Hz ÷ 42 kHz
S/N ratio A(A weighted @ 1 V): 103 dBA
Input sensitivity Pre-In0.6 ÷ 6 VRMS
Input sensitivity Speaker-In2.2 ÷ 22 VRMS
Total Power RMS1040 W
Minimum load impedance4 Ch 2Ω
2 Ch - (Bridge) 4Ω
Output Power (RMS) @14.4 VDC, 1% THD4Ch @ 4Ω: 160 W x 4

4Ch @ 2Ω: 260 W x 4

2Ch (Bridge 1/2; 3/4) @ 4Ω: 520 W x 2
Adjustable CrossoverNo

Audison AF M4D Four Channel

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