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!

SPECIFICATIONS:
AMPLIFIER TECH DATA
Channels: 4
Class: D-Class
Efficiency: 84%
Hi Level Input: Yes
Low Level Input: Yes
Digital Input: No
Power supply voltage / fuse: 11 ÷ 15 VDC
Operating power supply voltage: 6.5 ÷ 17.5 VDC
Idling current: 0.004 A
Idling current when off: 0.6 mA
Consumption @ 14.4 VDC, 2Ω, Max Musical Power: 25 A
Remote OUT: 6.5 ÷15 VDC (150 mA)
Remote IN: 4 ÷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 Power: 0,03%
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-In: 0.6 ÷ 6 VRMS
Input sensitivity Speaker-In: 2.2 ÷ 22 VRMS
Total Power RMS: 600 W
Minimum load impedance: 2Ω:
Output Power (RMS): @14.4 VDC, 1% THD, 4Ch @ 4Ω: 90 W x 4, 4Ch @ 2Ω: 150 W x 4, 2Ch (bridge) @ 4Ω: 300 W x 2
Adjustable Crossover: No

CEA SPECIFICATIONS
Output power @ 4Ω, 1% THD+N, 14.4 V: 90 W x 4
SN ratio (ref. 1W output): 81 dBA

INPUTS
Input Type: Pre-In / Speaker-In
Remote Sub Volume: ±12 dB

OTHER
Fuse: 1 x 30 A