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AF M4D Amplifier | 1040 W total power | 4 x 260 W @ 2ohm | D-class Fully Bridgeable

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.

Amplifier Tech Data

Channels 4
Class D-Class
Efficiency 83 %
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 1.12 A
Idling current when off 0.007 mA
Consumption @ 14.4 VDC, 2Ω, Max Musical Power 47 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 0.05%
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-In 0.6 ÷ 6 VRMS
Input sensitivity Speaker-In 2.2 ÷ 22 VRMS
Total Power RMS 1040 W
Minimum load impedance 4 Ch 2Ω
2 Ch - (Bridge) 4Ω
Output Power (RMS) @14.4 VDC, 1% THD 4Ch @ 4Ω: 160 W x 4

4Ch @ 2Ω: 260 W x 4

2Ch (Bridge 1/2; 3/4) @ 4Ω: 520 W x 2
Adjustable Crossover No

CEA Specifications

Output power @ 4Ω, 1% THD+N, 14.4 V 150 W x 4
SN ratio (ref. 1W output) 80 dB

Inputs

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

Other

Fuse 2 x 30A
Weight 2.04 kg

Dimensions

AF M4D
Dimension A 240 mm
Dimension B 156 mm
Dimension C 47 mm

Box Content

REMOTE IN-OUT AF AMP
REMOTE IN-OUT AF AMP
Provided remote in-out cable to manage Power-on and Energy Save mode.
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SPK OUT 4CH
SPK OUT 4CH

Provided cable with four pairs of labeled cables to connect the speakers to the AF M5.11 bit.

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PRE IN CABLE 2 CH
PRE IN CABLE 2 CH

Provided in pair. Two stereo RCAs interconnection to connect Forza bit amplifier with after-market sources with PRE-OUT outputs provided with Forza amplifiers.

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SPEAKER IN CABLE 4 CH
SPEAKER IN CABLE 4 CH

Provided cable with 4 pairs of labeled wires to connect Forza bit amplifiers bit with the high-level output of OEM sources.

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Accessories

VCR-S2
VCR-S2
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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AF LINK CABLE
AF LINK CABLE

The Audison AF Link is an accessory cable to connect the DSP OUT outputs of the Audison AF bit amplifiers (amplifiers with integrated DSP) to the PRE IN inputs of the Audison AF D amplifiers.

Look at all the connection examples in the Owner’s manual !

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Features

  • Improved audio performance and power thanks to the latest generation of ADT (Audison D-Class) technology
  • Unbeatable power/volume ratio up to 0.68 W RMS/cm³ reaching 83% 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

Technologies

AF LINK CABLE
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.

AF LINK CABLE

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.

AF LINK CABLE

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

AF LINK CABLE

According to the definition of Hi-Res audio provided by JAS (Japan Audio Society), this amplifier exceeds the above 40 kHz bandwith analog requirement.

AF LINK CABLE

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

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