Marantz AMP 20 12 Channel Power Amplifier

Description

About the Marantz AMP 20 12 Channel Power Amplifier

The Marantz AMP 20 12 Channel Power Amplifier delivers 12 channels of amplification, each rated at 200 watts per channel, with Marantz’s custom-developed Class D amplification and refined HDAM-SA2 technology. Marantz positions it as a high-power, high-channel-count amplifier for ultimate home theatre performance.

It also includes selectable output modes, including normal, BTL bridged, and bi-amp operation. In normal mode, it is rated at 200W per channel into 8 ohms, while BTL mode can bridge channel pairs for 400W into 8 ohms. It also supports 400W into 4 ohms under Marantz’s specified two-channel driven rating.

What We Think

At Rapallo, the Marantz AMP 20 is the power amplifier to choose when a serious home theatre system needs more authority, more channels, and more upgrade flexibility than an AV receiver can provide.

The 12-channel layout makes it highly practical. Use one AMP 20 with a Marantz AV 20 processor for a premium separates-based cinema system, or combine it with other Marantz power amplifiers where a larger speaker layout requires more channels. The AMP 20 sits below the flagship AMP 10, but it still delivers reference-style performance for systems that do not need 16 amplifier channels.

We also like the flexibility. Each channel can be fed from balanced or unbalanced inputs using selector switches. You can run the amplifier normally, bridge selected channel pairs for more output, or use bi-amp mode with compatible speakers. That makes the AMP 20 useful for front stage power, full-room amplification, height channels, or a complete 7.x.4 / 9.x.2 style cinema system depending on the processor and speaker layout.

For NZ customers planning a premium Dolby Atmos, DTS:X, AURO-3D, or multi-channel music system, the AMP 20 is best used with careful rack ventilation, quality cabling, and professional calibration. It is a serious amplifier for rooms where dynamic headroom, clean separation, and consistent power across many channels matter.

 

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The Marantz AMP 20 Is Ideal For

• Premium home theatre separates systems
• Marantz AV 20 processor systems
• Customers upgrading from AV receiver amplification
• Dolby Atmos, DTS:X, and AURO-3D speaker layouts
• Larger rooms needing stronger multi-channel power
• Systems needing balanced or unbalanced connection flexibility
• Installations where 12 channels of consistent power are required

 

What the Experts Say

• AVForums reviewed the Marantz AV 20 and AMP 20 pairing and gave the system a 9/10 score. It praised the exquisitely detailed soundstage, warm Marantz signature sound, hi-fi grade music presentation, luxury design, and build quality. It also noted that the AMP 20 gives the system extra dynamic headroom compared with receiver-based setups.
• StereoNET found the AMP 20 capable of driving speakers with ease and delivering powerful dynamics, noting that this much power brings a speaker system to life in a way many lower-powered amplifiers and AV receivers cannot.

 

Frequently Asked Questions

1. What is the Marantz AMP 20?
   The Marantz AMP 20 is a 12-channel power amplifier for premium home theatre separates systems. It is designed to power multiple speakers when used with an AV processor such as the Marantz AV 20.
2. How many channels does the AMP 20 have?
   The AMP 20 has 12 channels of amplification. This makes it suitable for large immersive home theatre speaker layouts.
3. How much power does the Marantz AMP 20 produce?
   It is rated at 200 watts per channel into 8 ohms. It can also deliver 400 watts in bridged BTL mode and 400 watts into 4 ohms under Marantz’s specified test conditions.
4. Does the AMP 20 have balanced inputs?
   Yes, the AMP 20 has balanced and unbalanced main amplifier inputs for all 12 channels. Each input type is selected by switch.
5. What is BTL mode on the AMP 20?
   BTL mode bridges two amplifier channels to drive one speaker with higher output. On the AMP 20, this can provide 400W into 8 ohms for bridged channels.
6. What is bi-amp mode?
   Bi-amp mode lets the amplifier drive separate high and low frequency sections of compatible speakers. This can improve control and reduce interference when the speakers and setup support it.
7. Does the AMP 20 include HDMI or surround processing?
   No, the AMP 20 is a power amplifier only. It does not include HDMI, decoding, streaming, or room correction. Use it with an AV processor such as the Marantz AV 20.
8. Is the AMP 20 a good match for the Marantz AV 20?
   Yes, the AMP 20 is designed as a natural partner for the Marantz AV 20. Together they form a premium 13.4-channel capable home theatre separates platform.
9. How is the AMP 20 different from the AMP 30?
   The AMP 20 has 12 amplifier channels, while the AMP 30 has 6 channels. Both are rated at 200W per channel, but the AMP 20 is better suited to larger systems that need more channels in one chassis.
10. Who is the Marantz AMP 20 best suited to?
    It is best for home theatre enthusiasts and custom installations that need dedicated 12-channel power, balanced and unbalanced input flexibility, BTL or bi-amp modes, and premium Marantz separates performance.

 

Key Features

• Crafted in Shirakawa, Japan
• 12 Channels
• 200 Watts per Channel
• Exclusive HDAM
• Custom Switching Amplifiers
• Selectable Output Modes
• 442 x 191 x 442mm (W/H/D)

12 Channels of Dedicated Power

The AMP 20 provides 12 channels of amplification in one chassis. This makes it ideal for premium home theatre systems with multiple surround, height, and main speaker channels.

200W Per Channel Output

Marantz rates the AMP 20 at 200W per channel into 8 ohms, measured at 1kHz, 0.05% THD, with two channels driven. It is also rated at 200W per channel into 8 ohms with five channels driven at 0.7% THD.

400W Bridged BTL Mode

BTL mode bridges two amplifier channels to drive one speaker with higher output. Marantz specifies 400W into 8 ohms in BTL mode, while B&H also describes BTL mode as using two AMP 20 channels for one speaker to increase power to 400W.

400W into 4 Ohms

The AMP 20 is rated at 400W into 4 ohms, measured at 1kHz, 0.7% THD, with two channels driven. This gives it strong drive capability for suitable lower-impedance speakers.

Custom Class D Amplification

Marantz uses custom-developed Class D amplification in the AMP 20. This gives the amplifier high power output, reduced heat, and a more compact form than many traditional high-channel-count power amplifiers.

Refined HDAM-SA2 Technology

The AMP 20 uses Marantz HDAM-SA2 technology. Marantz combines this with the Class D platform to preserve its refined, musical house sound while delivering the power needed for demanding home theatre systems.

Balanced and Unbalanced Inputs

Each channel can be connected from a compatible AV preamp using balanced or unbalanced main amplifier inputs. Marantz lists 12-channel balanced and unbalanced main amplifier input, selectable by switch. This is useful for flexible rack installation and low-noise system design.

Bi-Amp Drive Mode

Bi-amp mode lets the AMP 20 drive separate high and low frequency sections of compatible speakers. This can help reduce interference and improve overall sound quality when used with suitable speakers and correct setup.

Copper-Plated Chassis

The AMP 20 uses a copper-plated chassis, which is part of its premium AV separates construction. Marantz also lists a metal front panel and level meter display.

Premium Speaker Terminals

The AMP 20 uses Marantz SPKT-1+ speaker terminals, with 12 speaker terminal sets. The binding posts are excellent chunky designs that allow bare wire or banana plugs to protrude at 45 degrees for easier fastening.

Reference Marantz Design

The front panel includes Marantz’s premium design language, with an illuminated porthole-style level meter, metal front panel, and soft side lighting. The analogue porthole level meter and metal front panel are part of the amplifier’s premium finish.

Sound Master Tuned

The AMP 20 is tuned by a Marantz Sound Master. Marantz says careful parts selection is used to create outstanding performance in home theatre systems

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Suggested System Pairing with the Marantz AMP 20

• AV Processor: Marantz AV 20
• Larger Systems: Add Marantz AMP 30, AMP 10, or a second AMP 20 depending on channel needs
• Speakers: Focal Aria Evo X, Focal Kanta, Paradigm Founder, SVS Ultra Evolution, Triangle, ELAC, or Klipsch Heritage for home theatre systems

• Subwoofers: SVS sealed or ported subwoofers matched to room size and output goals
• Cables: Black Rhodium XLR interconnects, quality speaker cable, and 12V trigger cable where required
• Room Type: Dedicated cinema rooms, premium lounge theatres, media rooms, and custom AV installations

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Product Comparison Snapshot

Model	Best For	Key Difference
Marantz AMP 30	Smaller separates systems or channel expansion	6-channel amplifier, 200W per channel
Marantz AMP 20	Premium 12-channel home theatre systems	12 channels, 200W per channel, BTL and bi-amp modes
Marantz AMP 10	Reference large-scale home theatres	16-channel flagship amplifier
Marantz CINEMA 30	High-end all-in-one AV receiver systems	Processing and amplification in one chassis

 

Specifications

Brand: Marantz

Model: AMP 20

Product Type: 12-Channel Power Amplifier

Amplifier Type
Multi-channel power amplifier

Number of Power Amps
12

Amplification Technology
Custom-developed Class D amplification
Marantz HDAM-SA2 technology

Power Output, 8 Ohms
200W per channel, 1kHz, 0.05% THD, 2-channel driven

Power Output, BTL Mode
400W, 8 ohms, 1kHz, 0.05% THD, bridged

Power Output, 4 Ohms
400W per channel, 1kHz, 0.7% THD, 2-channel driven

Power Output, 5-Channel Driven
200W per channel, 8 ohms, 1kHz, 0.7% THD

Output Modes
Normal
BTL bridged mode
Bi-amp mode

Inputs
12-channel balanced main amplifier input
12-channel unbalanced main amplifier input

Input Selection
Balanced and unbalanced inputs selected by switch

Speaker Outputs
12 speaker terminal sets
Marantz SPKT-1+ speaker terminals

Control Connections
RS232 control
IR flasher input
Marantz Remote Bus
DC trigger input
DC trigger output

Front Display
Level meter

Front Panel
Metal front panel

Chassis
Copper-plated chassis

Auto Power Off
Yes

Power Consumption
400W

Power Consumption, No Sound
110W

Standby Consumption
0.2W

Maximum Dimensions
17.4 x 17.4 x 7.5 inches
Approx. 442 x 442 x 190mm

Weight
39.7 lb
Approx. 18kg

Finish
Black

Included Accessories
Main unit
Quick start guide
AC cord
Amp control cable
Remote control cable
Speaker terminal wrench

Rapallo Product Data

MPN: AMP20

SKU: MARANTZ-AMP20

EAN / UPC / GTIN: 747192143930

 

Why Buy From Rapallo

✔ Expert advice on matching AV processors, power amplifiers, and speakers
✔ Help planning Dolby Atmos and multi-channel speaker layouts
✔ NZ support and after-sales service
✔ Trusted hi-fi and home theatre specialists
✔ Practical guidance for cabling, rack layout, ventilation, and calibration