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 90W x 4 @4Ω*, 150W 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 300W x 2 @4Ω*, guaranteeing flexible and powerful performance. *Output Continuous Power (RMS) @14.4 VDC, 1% THD, all channels driven.

AMPLIFIER TECH DATA

Channels4

ClassD-Class

Efficiency84%

Hi Level InputYes

Low Level InputYes

Digital InputNo

Power supply voltage / fuse11 ÷ 15 VDC

Operating power supply voltage6.5 ÷ 17.5 VDC

Idling current0.004 A

Idling current when off0.6 mA

Consumption @ 14.4 VDC, 2Ω, Max Musical Power25 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

AMPLIFIER STAGE

Distortion - THD @ 100 Hz, 4Ω, 70% Rated Power0,03%

Bandwidth A(-3 dB, 2 VRMS, 4 Ω): 10Hz ÷ 40kHz

S/N ratio A(A weighted @ 1 V): 102 dBA

Damping factor A(1 kHz, 4Ω, 2 VRMS): 95

Input sensitivity Pre-In0.6 ÷ 6 VRMS

Input sensitivity Speaker-In2.2 ÷ 22 VRMS

Total Power RMS600 W

Minimum load impedance2Ω:

Output Power (RMS) @14.4 VDC, 1% THD4Ch @ 4Ω: 90 W x 4

4Ch @ 2Ω: 150 W x 4

2Ch (bridge) @ 4Ω: 300 W x 2

Adjustable CrossoverNo

CEA SPECIFICATIONS

Output power @ 4Ω, 1% THD+N, 14.4 V90 W x 4

SN ratio (ref. 1W output)81 dBA

INPUTS

Input TypePre-In / Speaker-In

Remote Sub Volume±12 dB

OTHER

Fuse1 x 30 A

Weight1.49 kg