Rotel RMB-1587MKII 7-Channel Power Amplifier

The Rotel RMB-1587MKII 7-Channel Power Amplifier is a high-current Class AB multichannel amplifier engineered for premium home theater and immersive audio systems. It delivers 155 watts per channel into 8 ohms or 250 watts per channel into 4 ohms with all seven channels driven simultaneously, backed by dual toroidal transformers and a massive 120,000µF energy reserve. Rotel

Unlike multichannel amplifiers whose available output can fall substantially as more channels are driven, the RMB-1587MKII is specified with all seven channels operating. For systems demanding additional front-channel headroom, output reaches 335 watts per channel into 4 ohms with two channels driven. Rotel

Seven Channels of Class AB Amplification

The RMB-1587MKII provides seven discrete channels of Rotel's traditional Class AB amplification. Continuous output is rated at 155W/ch into 8 ohms and 250W/ch into 4 ohms with all seven channels driven, making it particularly well suited to large surround systems using demanding loudspeakers. Rotel

Rotel's current U.S. page additionally lists FTC ratings of 165W/ch with seven channels driven into 8 ohms and 210W/ch with two channels driven into 8 ohms. Rotel

Dual Toroidal Transformers

The RMB-1587MKII's substantial output begins with two high-current toroidal transformers manufactured in-house by Rotel. These feed eight high-efficiency bulk storage capacitors, providing the amplifier with substantial current reserves for demanding movie soundtracks and multichannel music. Rotel

The dual-transformer architecture is especially important in a seven-channel amplifier, where multiple speakers may simultaneously demand significant power during dynamic peaks.

120,000µF Power Reserve

Rotel equips the RMB-1587MKII with eight high-efficiency bulk storage capacitors totaling 120,000µF. The large energy reserve supports sustained current delivery and controlled low-frequency reproduction under demanding multichannel loads. Rotel

High-quality slit-foil capacitors are part of Rotel's upgraded MKII power-supply architecture. Rotel

MKII Circuit Architecture

The RMB-1587MKII incorporates significant upgrades to both its power supply and amplifier stages as part of Rotel's MKII design architecture. Rotel cites improved signal isolation, lower distortion and high-gain output capability as core objectives of the redesign. Rotel

Total harmonic distortion is specified below 0.03%, with intermodulation distortion also below 0.03%. Frequency response extends from 10 Hz to 100 kHz, while a 330 damping factor contributes to electrical control over connected loudspeakers. Rotel

Balanced XLR & RCA Inputs

Every channel provides both balanced XLR and unbalanced RCA connectivity, allowing the RMB-1587MKII to pair with a broad range of premium AV processors and preamplifiers.

Rotel specifies 1.61V sensitivity / 12kΩ impedance for RCA and 3.4V / 50kΩ for XLR, with overall amplifier gain of 26.6 dB. Rotel

Optimized Cooling for High-Output Cinema Systems

Driving seven Class AB channels from one chassis generates considerable heat, so Rotel equips the RMB-1587MKII with four thermostat-controlled, variable-speed ultra-low-noise cooling fans. Rotel

This active thermal management helps the amplifier maintain operating stability when installed in high-output theaters where several channels may be working hard simultaneously.

12V Trigger & Rack Integration

A 12V trigger input and output allows the RMB-1587MKII to power on and off automatically with a compatible surround processor or control system. Rotel's current U.S. product page also specifies rack ears included, useful for dedicated equipment-rack installations. Rotel

At 82.9 pounds and 5U high, this is a substantial amplifier intended for permanent installation rather than casual placement in lightweight furniture.

Technical Details

Rotel's specification PDF lists frequency response as 10 Hz–100 kHz (+0/-0.3 dB), while the current U.S. web page displays -3 dB. Because both the owner's manual and specification sheet agree on -0.3 dB, I would use +0/-0.3 dB in the Shopify listing. Rotel

Rotel RMB-1587MKII at The Grid HiFi

The Rotel RMB-1587MKII is built for serious private cinema systems where seven channels need genuine high-current amplification. Its ability to deliver 250 watts per channel into 4 ohms with all seven channels driven, combined with dual toroidal transformers, 120,000µF of energy storage and balanced XLR connectivity, makes it particularly well suited to demanding LCR, surround and immersive audio speaker systems.

It can serve as the primary amplifier for a 7-channel theater, or become part of a larger Dolby Atmos or DTS:X system alongside additional stereo or multichannel amplification.

The Grid HiFi offers Rotel components to customers throughout the United States, with expert support for matching the RMB-1587MKII to AV processors, loudspeakers, subwoofers, projection systems and complete private cinema installations. Customers can also arrange an in-person Rotel demonstration at our Houston showroom.

Building a serious home theater? Call The Grid HiFi at (713) 218-8120 for expert amplifier matching, system design and installation.