Marantz MM7055 - 5 Channel Power Amplifier

Marantz MM7055 Power Amplifier

The Marantz MM7055 is a high-current 5-channel Class A/B power amplifier built to bring effortless dynamics, clean detail, and signature Marantz musicality to a 5.1 home theater or multichannel music system. Designed with Current Feedback topology and discrete amplification, it delivers stable, authoritative control over real-world speaker loads—so dialog stays clear, effects hit harder, and music keeps its natural tone even when you turn it up. Premium engineering touches like Marantz’s heat-managing “thermal tunnel” output stage and a robust EI-core transformer power supply help the MM7055 stay composed scene after scene and track after track. With both balanced XLR and unbalanced RCA inputs for every channel, plus flexible trigger and remote-control connections, it’s an easy upgrade for AV receivers with pre-outs or dedicated surround processors when you want noticeably better power, headroom, and clarity. The Marantz MM7055 is part of ListenUp's Marantz Amplifiers Collection.

What It's Great At:

• Driving a full 5.1 system with consistent, clean power and strong dynamic headroom
• Improving clarity and punch versus receiver-only amplification (especially at higher volumes)
• Handling tougher speaker loads with high-current design and low-impedance capability
• Delivering a refined, detailed sound thanks to Current Feedback and discrete output stages
• Flexible system integration with XLR/RCA inputs per channel, plus DC trigger control
• Running cool and stable with Marantz’s heat-dissipating thermal tunnel architecture

Marantz MM7055 Full Specifications:

• Model: Marantz MM7055
• Type: 5-channel power amplifier
• Amplifier Class: Class A/B
• Number of Channels: 5
• Current Feedback Topology: Yes
• Discrete Amplification: Yes
• Power Transformer: Large capacity EI-core
• Energy Storage Capacity: Over 65,000 µF (custom-designed)
• Rated Power Output (8Ω): 140 W/ch (20 Hz–20 kHz, THD 0.08%)
• Rated Power Output (6Ω): 170 W/ch (20 Hz–20 kHz)
• Maximum Effective Output Power (6Ω): 210 W/ch (1 kHz, two channels driven)
• Output Bandwidth (8Ω load, THD 0.09%): 5 Hz – 40 kHz
• Frequency Response (1 W, 8Ω): 8 Hz – 100 kHz (±3 dB)
• S/N Ratio: 105 dB (IHF-A)
• Voltage Amplification Level (Gain): 29 dB
• Damping Factor: 100
• Input Sensitivity / Impedance (Unbalanced): 1.2 V / 22 kΩ
• Input Sensitivity / Impedance (Balanced): 2.4 V / 30 kΩ
• Main Amplifier Inputs: Balanced & Unbalanced: 5ch (exclusive use by a selector switch)
• Speaker Terminals: Audiophile-grade, gold-plated 4-way binding posts
• DC Triggers: 1 In / 1 Out
• D-Bus Remote (RC-5): In/Out 1 – 1
• Flasher In / IR Receiver In / Emitter Out: 1 / 0 / 0
• Detachable Power Cord: Yes (IEC320 2-pin type)
• Power Consumption: 660 W
• Standby Power Consumption: 0.2 W
• Power Requirement (Site Listing): Not specified
• Supply Voltage (Sell Sheet): AC 230 V, 50 Hz (may vary by region)
• Front Panel Material: Aluminum / glass-reinforced resin
• Display: Porthole display with blue illumination accent (illumination off mode available)
• Finish/Color: Black
• Dimensions (W x H x D): 17-3/8 x 7-3/16 x 15-1/8 in
• Maximum External Dimensions: 440 (W) x 183 (H) x 384 (D) mm
• Weight: 34.6 lb (15.7 kg)
• Warranty: 3-year warranty
• THX / DTS / Dolby / DSP / DAC / Networking / Tuner: No (not applicable to a power amplifier)
• HDMI / Digital Audio / Video I/O: None

Marantz MM7055 Q&A:

What is the MM7055 best used for?

It’s ideal for powering a 5.1 home theater or multichannel music system, especially when you want more headroom, control, and clarity than a receiver’s internal amps can provide.

Can I use this with my AV receiver?

Yes—if your receiver has preamp outputs (pre-outs), you can connect them to the MM7055 and let it power your speakers while the receiver handles processing.

Does it support balanced XLR connections?

Yes. Each channel includes balanced (XLR) and unbalanced (RCA) inputs, and you can choose the input type per channel.

How much power does it deliver per channel?

It’s rated at 140 W per channel into 8Ω (20 Hz–20 kHz, 0.08% THD) and 170 W per channel into 6Ω.

Will it work with low-impedance speakers?

The MM7055 is designed for high current delivery and low-impedance continuous drive capability, helping it stay stable with more demanding speakers.

Can it turn on automatically with my system?

Yes. It includes 12V DC trigger input/output so it can power on/off in sync with compatible preamps, processors, or receivers.

Does it include speaker terminals suitable for thicker cable?

Yes. It uses gold-plated 4-way binding posts, making it easy to use banana plugs, spades, or heavier gauge wire.

Does it have HDMI or any audio decoding built in?

No. It’s a power amplifier only—you’ll use an AV receiver or surround processor for switching, decoding, and volume control.

Marantz MM7055 Downloads:

Marantz MM7055 User Guide