The MM7055 is a refined amplifier with ample power for the most demanding home theater setups and delivers exceptional musical clarity.
Classic Design
5 Channels
140 Watts per Channel
Class A/B Amplifier

Specifications
5-channel power amplifier
140 watts per channel into 8 ohms (20-20,000 Hz) at 0.08% THD, with 2 channels driven
frequency response: 8-100,000 Hz (±3 dB)
signal-to-noise ratio: 105 dB
one RCA and one XLR input for each channel
Discrete Current Feedback circuit for accurate, natural sound at all volume levels
DC trigger input/output
IR flasher input
massive power supply for high current and low noise
gold-plated binding post speaker terminals
detachable power cord
weight: 34.6 lbs.
17-3/8"W x 7-1/4"H x 16-1/4"D

The MM7055 5-Channel Power Amplifier from Marantz is designed to deliver powerful multi-channel sound. This amplifier features a discrete amplification design for robust sonic delivery. Each channel in the amplifier delivers up to 140W of power at 8 ohms and 170W at 6 ohms. It is also equipped with balanced and unbalanced input options, allowing you to connect a wide variety of pre-amplifiers and processors. This amplifier is capable of efficiently driving stereo and 5-channel home entertainment systems.
Current Feedback Discrete Power Amplifier
This model is equipped with a current feedback amplifier section that uses the same push-pull circuit found in Marantz's SM-11S1 Hi-Fi power amplifier. This amp is designed to provide increased operating stability, and high-speed, wide-ranging, high-density playback. The current/voltage conversion amplification section in the latter part of the power amp is equipped with a Wilson current mirror circuit that amplifies to the high sound range with low distortion.
Large Power Transformer
The final stage of the power amp is equipped with the same LAPT (high-efficiency power transistor) that is installed in the SM-11S1 Marantz Hi-Fi power amp, providing improved instant power supply capability. The power section is equipped with a large-sized transformer. As one of the essential parts of the power section, this unit is equipped with a notable Marantz 33,000 μF / 71 V×2 block condenser. These improvements to the power supply are engineered to provide a powerful and presence-filled sound.
High-Quality Design
This amplifier is equipped with a chimney-shaped heat sink to efficiently process the heat emitted from each channel along with quiet cooling fans. A high-sensitivity temperature sensor IC is used to control the cooling fans, adjusting the rotation speed to match the amount of heat generated by the amp.
Balanced and Unbalanced Inputs
For installation flexibility and maximum compatibility, each channel on this amplifier is equipped with balanced and unbalanced inputs.
Custom-Installation-Ready
This amplifier has an IR flash input that supports custom installations and DC trigger input and output terminals.