audio research

Solid state class T digital switching modular multichannel power amplifier. Up to seven individual power amplification modules can be installed.

From the ARC website

The market for multichannel power amplifiers is crowded, competitive and compromised. Most conventional designs have shortcomings in terms of size, heat, or, most importantly, sonic performance. Audio Research has waited to enter this market until the technology to break through these compromises was fully developed. That time has come.

The 150M is unlike any previous amplifier design you have seen from Audio Research. First, it is based on a truly modular design, with a main chassis capable of housoing up to seven individual power amplification modules, each rated at 150 watts continuous into 8 ohms, 300 watts into 4 ohms. These power modules employ a unique switching amplifier that modulates its frequency with amplitude/power demand - yielding a highly efficient circuit that generates very little heat. It's called a "Class T" design, and it makes the 150M ideal for any imaginable custom-installation application. Further, the modules are a plug-in design that attach internally via multipin connectors, so modules can be added or replaced as needed by a qualified technician.

Each module may be fed with either a balanced or single-ended signal (there are input jacks for both), and each module has a pair of gold-plated 5-way binding posts for outputs. Input impedance is 150k ohms single-ended and 300k ohms balanced, with identical overall gain in either mode. In addition, pairs of modules may be bridged at the factory for four times the output (600 watts into eight ohms, each pair).

Like every other Audio Research power amplifier, the 150M was developed to meet the most challenging sonic criteria. Power supply design and individual module layout have been optimized to yield stunningly musical results whether running two channels or seven. We believe that 150M begs comparison with any solid state amplifier available, and in fact has the important hallmarks of our tube designs: a natural, spacious soundstage, great bass definition and impact, sweetly resolved highs and lifelike musical dynamics. Whether playing back an adventure-film soundtrack or a concert video, the 150M stays composed and natural-sounding like no other multichannel design we've heard. Used with your favorite a-v processor, the 150M produces more musical results with less listener fatigue.

The 150M may be ordered with one to seven power modules installed.




Handles $70/pair. Increased to $90/pair on December 1st 2005. Increased to $100/pair on January 1st 2007.

MSRP (US new retail)
$2,745 chassis only. Increased to $2,995 on Jan 01 2004. Increased to $3,495 on December 1st 2005. Increased to $3,995 on January 1st 2007.
$750/amplification module. Increased to $900 on Jan 01 2004. Increased to $1,000 on January 1st 2007.


Power output Each amplification module: 150 Watts continuous into 8 Ohm and 300 Watts into 4 Ohm (1% THD). Can be factory bridged for 600 Watts continuous into 8 Ohm each pair of modules.
Power bandwidth (-3dB points) 5Hz to 40kHz into 8 ohms, or 4 ohms.
Frequency response (-3dB points at 1W) 5Hz to 120 kHz.
Input sensitivity 1.4V RMS for rated output (27 dB Gain) single-ended or balanced.
Input impedance 150K ohms single-ended, 300K ohms balanced differential.
Output taps  
Output regulation 0.05 dB 8 ohm load to open circuit.
Overall negative feedback  
Damping factor 200
Slew rate 15 volts/microsecond. (20% maximum duty cycle).
Rise time 2.0 microseconds.
Hum & noise 500mV RMS (96dB below rated output IHF A-weighted).
Power supply energy storage 192,000 uF total.
Power requirements 100 -125VAC 60Hz (200-250VAC 50Hz) 400 watts at rated output, (150WPC 8 ohms), 770 watts at 300WPC 4 ohms, 55 watts idle(Model 150M.2).120 watts idle, 1200 watts maximum (Model 150M.7).
Other Output Polarity: Non-inverting from single-ended inputs. Balanced pin 2+ (IEC-268).
Output Current: 20 amps peak at protective shutdown.
Dimensions 19" (48 cm) W (standard rack panel) x 7" (17.8 cm) H x 18 1/2 (47.0 cm) D (front panel back). Output connectors extend 1.0" behind rear panel.
Weight 45.8 lbs. (20.8 kg) Net; 64 lbs. (29.1 kg) Shipping. (Model 150M.2). 56.3 lbs. (25.6 kg) Net: 75 lbs. (34.1 kg) Shipping (Model 150M.7)