The Marantz MM8077 is a seven-channel power amplifier designed for demanding home cinema and multi-channel hi-fi installations. It draws directly on the amplifier technology developed for Marantz's reference-class stereo amplifiers, bringing the same current feedback discrete output stage topology to multichannel duty. Each of the seven channels delivers 150W into 8 ohms (180W into 6 ohms) at 0.03% THD, and all output stages are built to identical specifications — ensuring uniform sonic character across every channel in the system.
Current Feedback Discrete Topology
Unlike conventional voltage feedback designs, the MM8077 uses a current feedback topology throughout each output stage. This approach offers a naturally high slew rate, which translates to wide operating bandwidth and fast transient response — qualities that matter most when reproducing the complex, dynamically demanding soundtracks of modern high-resolution audio formats. High-current, high-bandwidth discrete power transistors are specified for each channel, capable of driving difficult low-impedance speaker loads without compression or stress.
Power Supply
A high-current toroidal mains transformer anchors the power supply, feeding a bank of custom Marantz-specified filter capacitors with a combined capacitance of 100,000μF. This substantial reservoir is sized to handle sharp short-term transient peaks across all seven channels simultaneously, ensuring the amplifier does not compress dynamics under heavy multichannel programme material. The chassis is copper-plated internally to minimise electromagnetic interference.
Connectivity
Each of the seven channels offers both balanced XLR and unbalanced RCA inputs, selectable via a dedicated input mode switch on the rear panel. This provides maximum flexibility when integrating the MM8077 with AV processors, pre-amplifiers, or active crossover systems. On the output side, gold-plated, high-grade loudspeaker terminals are fitted to each channel. System integration is supported via DC trigger in and out (one of each), a Marantz D-Bus remote control bus (in and out), and a flasher/IR input for third-party control systems.
Build Quality
The front panel is constructed from aluminium, complemented by a glass-reinforced resin surround. An aluminium extrusion heatsink runs across the amplifier's flanks, and the copper-plated internal chassis provides electromagnetic shielding between channels. The MM8077's auto standby mode engages when no signal is detected, drawing just 0.4W at idle.