Marantz AMP 20 12-Channel Power Amplifier

Marantz AMP 20 Power Amplifier

Marantz AMP 20 is a reference-grade 12-channel power amplifier built to anchor elite home theater systems with effortless authority and refined musicality. Each channel delivers clean, high-current performance using custom-developed Class D amplification paired with Marantz HDAM-SA2 technology for a dynamic, detailed, and immersive cinematic presentation. Designed for flexible system building, AMP 20 supports Normal, Bi-Amp, and BTL (bridged) modes—making it easy to configure everything from high-channel-count theaters to higher-power bridged speaker runs. Wrapped in Marantz’s iconic design language with a copper-plated chassis, SPKT-1+ speaker terminals, balanced XLR capability, and an analog-style porthole level meter, AMP 20 is the ideal match for the Marantz AV 20 to create a truly reference-level separates system.The Marantz AMP 20 is part of ListenUp's Marantz AV Separates Collection.

What It's Good At:

• Driving large home theater systems with 12 channels of high-power amplification in one chassis
• Delivering clean, low-noise dynamics with balanced XLR input support and 110 dB SNR (IHF-A)
• Offering system-building flexibility with selectable Normal, Bi-Amp, and BTL modes
• Producing wide-bandwidth clarity with a 5 Hz – 70 kHz (±3 dB) frequency response
• Maintaining stable speaker control across rated impedance ranges (Normal/Bi-Amp and BTL)
• Matching premium separates installations with CI-friendly control (RS232, IR, trigger, remote bus)

Marantz AMP 20 Full Specifications:

• Product Type: 12-Channel Power Amplifier (Reference series)
• Build Location: Crafted in Shirakawa, Japan
• Amplification Topology: Custom-developed Class D amplification
• Analog Technology: Marantz HDAM / HDAM-SA2 technology
• Number of Channels / Power Amps: 12
• Power Output (Rated):
  • 8 ohm, 1 kHz, 0.05% THD, 2ch drive: Normal / BTL = 200 W / 400 W
  • 4 ohm, 1 kHz, 0.7% THD, 2ch drive: Normal = 400 W x 2
  • 8 ohm, 1 kHz, 0.7% THD, 5ch drive: Normal = 200 W
• Speaker / Load Handling:
  • Output connectors (speaker load): Normal / Bi-Amp = 4 – 16 Ω
  • Output connectors (speaker load): BTL = 8 – 16 Ω
• Frequency Response (1 W, 8 Ω): 5 Hz – 70 kHz (±3 dB)
• Signal-to-Noise Ratio (IHF-A): 110 dB
• Voltage Amplification Level: 29 dB
• Main Amplifier In (Balanced & Unbalanced): 12ch (exclusive use via selector switch)
• Input Sensitivity / Impedance (Unbalanced): 1.4 V / 47 kΩ
• Input Sensitivity / Impedance (Balanced): 2.8 V / 100 kΩ
• Speaker Terminal: SPKT-1+
• Number of Speaker Terminals: 12
• Bi-Amp Drive / BTL Drive: Yes / Yes
• Control / CI:
  • RS232 Control: Yes
  • IR Flasher In: Yes
  • Marantz Remote Bus: Yes
  • DC Trigger Input / Output: 1 / 1
• Chassis: Copper plated
• Front Display: Level meter
• Level Meter: Yes
• Metal Front Panel: Yes
• Power Supply: AC 120 V, 60 Hz
• Power Consumption: 400 W
• Power Consumption (No-Sound): 110 W
• Standby Consumption: 0.2 W
• Auto Power Off: Yes
• Operating Temperature: 41 °F – 95 °F (5 °C – 35 °C)
• Maximum Dimensions (W × D × H): 17.4 × 17.4 × 7.5 in.
• Weight: 39.7 lbs (18.0 kg)
• What's in the Box:
  • Main unit
  • Quick start guide
  • AC cord
  • Amp control cable
  • Remote control cable
  • SP terminal wrench

Marantz AMP 20 Q&A:

What is the Marantz AMP 20 designed for?

AMP 20 is built for reference-level home theater systems that need high channel count and high power, delivering 12 channels of premium amplification in a single chassis.

How much power does AMP 20 deliver per channel?

In Normal mode, it delivers 200 W per channel (8Ω, 1 kHz, 0.05% THD, 2ch drive) and can reach 400 W per channel into 4Ω (1 kHz, 0.7% THD, 2ch drive).

What is BTL mode and why would I use it?

BTL (bridged) mode combines two amplifier channels into one higher-power output, delivering 400 W into 8Ω (1 kHz, 0.05% THD, 2ch drive) for speakers or zones that benefit from extra headroom.

Does AMP 20 support balanced XLR connections?

Yes. It provides balanced and unbalanced main amplifier inputs (12 channels total), selectable via a switch for clean integration with high-end preamps and processors.

Can AMP 20 be used in custom-install and rack-style systems?

Yes. It supports RS232 control, IR flasher input, Marantz remote bus, and DC trigger input/output (1 in / 1 out) for integration-friendly operation.

What speakers can AMP 20 safely drive?

It supports 4–16Ω speaker loads in Normal/Bi-Amp modes and 8–16Ω in BTL mode, helping ensure stable operation across a wide range of speaker designs.

What makes AMP 20 “reference-level” beyond wattage?

It combines custom-developed Class D amplification with Marantz HDAM/HDAM-SA2 technology, a copper-plated chassis, wide frequency response, and a high 110 dB signal-to-noise ratio for clean, controlled performance.

What comes in the box with AMP 20?

The package includes the main unit, quick start guide, AC cord, amp control cable, remote control cable, and an SP terminal wrench.

Marantz AMP 20 Downloads:

Marantz Amp 20 User Manual