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Black Monoprice Unity power amplifier 131027 with stereo speaker outputs and 3.5 mm input

Monoprice Inc.

Monoprice 131027 Pro Sound Amplifier 150W 225W 450W Bridgeable

SKU CH-NBZE-D4S1W

Two-channel Class D amplifier delivering 150 W into 8 Ω or 225 W into 4 Ω, bridgeable to 450 W with 3.5 mm and dual RCA inputs

  • Product typeAmplifiers & Receivers
  • Key featuresClass D amplifier providing 150 W/channel (RMS) into 8 ohm l
  • Product weight5.9
  • Delivers 150 W per channel into 8 Ω speakers for clear stereo sound
  • Provides 225 W per channel into 4 Ω loads for higher output
  • Bridges to 450 W into a single 8 Ω speaker for mono power
  • Includes 3.5 mm stereo and dual RCA inputs for flexible connectivity
  • Weighs 5.9 units for easy rack or shelf placement

Monoprice 131027 Class D Amplifier

This two-channel Class D power amplifier is built for pro-sound installations and serious home audio. It delivers 150 watts per channel into 8-ohm loads and 225 watts per channel into 4-ohm loads. The unit also offers a bridge mode that combines both channels into a single 450-watt output for an 8-ohm speaker. It suits installers and enthusiasts who need clean, high-current power for passive speakers.

Installation and Common Issues

The amplifier accepts a 3.5 mm stereo input and dual RCA left/right inputs, allowing straightforward connection to mixers, receivers or media players. Speaker terminals use standard binding posts for bare wire or banana plugs. Ensure the total speaker impedance matches the selected mode; running 4-ohm loads in bridged configuration is not supported and will trigger protection or cause damage. Adequate ventilation around the 5.9 kg chassis is required to prevent thermal shutdown during extended high-level use.

Power Capacity and Headroom

In stereo mode the amplifier comfortably drives typical 8-ohm bookshelf or floor-standing speakers to high listening levels with 150 watts per channel. Switching to 4-ohm loads raises continuous output to 225 watts per channel, providing extra headroom for demanding drivers. When bridged, the single-channel 450-watt rating into 8 ohms suits subwoofers or large single speakers, but the bridged mode cannot drive 4-ohm loads. Users needing more channels or lower impedance support must look elsewhere.

How it compares

Measured against everything we stock in Pro Audio Equipment, at today’s prices. Recalculated every night.

Price $506.99
Pricier than about 90% of the 613 comparable items (median $56.99).

Specifications

Product
Brand nameMonoprice
Model name131027
Product typeAmplifiers & Receivers

Questions about this item

How do I confirm the amplifier is delivering 150 watts per channel into 8-ohm speakers after setup?

Play audio at a moderate level and verify both channels produce clear, undistorted sound; the unit should run cool thanks to its Class D design and 5.9 kg chassis.

What cables and speakers must I supply besides the included amplifier?

You need speaker wire for 4-ohm or 8-ohm loads, plus a 3.5 mm stereo or dual RCA source cable; no interconnects or speaker cables are bundled.

Should I run the 131027 in stereo at 225 watts per channel into 4 ohms or bridge it for 450 watts into 8 ohms?

Choose stereo mode for two 4-ohm speakers needing 225 watts each, or bridge mode for one 8-ohm speaker requiring 450 watts.

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