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 @4?*, 150W x 4 @2?* 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 @4?*, guaranteeing flexible and powerful performance.
*Output Continuous Power (RMS) @14.4 VDC, 1% THD, all channels driven.
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, 2?, 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, 4?, 70% Rated Power
0,03%
Bandwidth A
(-3 dB, 2 VRMS, 4 ?): 10Hz ÷ 40kHz
S/N ratio A
(A weighted @ 1 V): 102 dBA
Damping factor A
(1 kHz, 4?, 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
2?:
Output Power (RMS) @14.4 VDC, 1% THD
4Ch @ 4?: 90 W x 4
4Ch @ 2?: 150 W x 4
2Ch (bridge) @ 4?: 300 W x 2
Adjustable Crossover
No
CEA Specifications
Output power @ 4?, 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
Weight
1.49 kg
Features
Improved audio performance and power thanks to the latest generation of ADT (Audison D-Class) technology
Unbeatable power/volume ratio up to 0.47 W RMS/cm³ reaching 81% of efficiency
Hi-Res compatibility performance, with an extended audio band up to 40 kHz
Maximum versatility thanks to the possibility of using the bridging option for each pair of power outputs