If you look up the word "value" in the dictionary, don't be surprised to see a picture of the US acoustics USX-2150 amplifier sitting next to the entry! Its beefy internal components make it a performance monster, sending torrents of power flooding through your speaker system.

A variable low-pass crossover with a steep 24 dB per octave slope lets you tune your low frequencies to perfection. And if deep, strong bass is what you crave, the USX-2150 gives you up to 18 dB of killer bass boost!


  • stereo or bridged mono output
  • Tri-way capable (Tri-Way crossover required)
  • 225 watts x 2 channels at 2 ohms
  • 450 watts x 1 in bridged mode
  • requires 8-gauge power and ground leads — wiring and hardware not included with amplifier
  • MOSFET power supply and output devices
  • variable low-pass crossover (40-460 Hz, 24 dB/octave)
  • variable bass boost (0-18 dB) at 40 Hz
  • speaker-level inputs
  • anti-thump circuit
  • thermal, short-circuit, and power/ground reversal protection
  • blue power light strip
  • dimensions:17"W x 2-3/4"H x 9-5/8"D
  • 3-year warranty
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Hands-on research

What's in the box?

Download owner's manual

  • Blue amplifier with chrome trim and two 30-amp blade fuses in chassis
  • 1 Spare 30-amp blade fuse
  • 1 Speaker level input harness
  • 4 Plastic isolation mounting feet
  • 4 Self-tapping screws
  • 4 Flat washers
  • Manual
  • Warranty registration card with survey.

Product Research

Special Features
Additional Specs
Warranty Note

Special Features

Power Supply and Output Devices: High current MOSFET devices are used in the power supply and output stages of this amplifier.

Anti-thump Circuitry: There is a time delay turn-on with opto-coupled muting circuits for quiet, thump-free operation.

High Speed, Audio-grade Components: High speed, audio-grade components are used in all low level stages to help ensure signal integrity.

Protection Circuitry: Reverse polarity, thermal and short circuit protection circuits are used to help protect the amplifier from damage and ensure reliable operation.

LED Condition Indicators: A green power LED and a red protection LED are use to report the amp's operating status.

Blue Light Strip: There is a blue light strip on the top of the amplifier. The light strip illuminates when the unit is on.


Crossover Selector: The crossover selector switch can select flat (off) or lowpass (on) operation.

Level Control: The level control is a variable gain control with a range of 110mV to 8.8V.

Lowpass Frequency Control: This control is used to set the lowpass frequency for the built-in crossover; the control is variable from 40-460Hz (24 dB/octave slope).

Variable Bass Boost Control: The bass boost control allows you to dial-in a 0 to +18dB gain in bass output, centered at 40Hz.



  • +12V, Remote Turn-on and Ground Connections: gold-plated screw terminals; each terminal is 0.335" wide
  • Left and Right Speakers Outputs: gold-plated screw terminals (R- and L+ connections are used for bridged mode); each terminal is 0.335" wide
  • High Level Input: a 3-pin jack used with the supplied Molex harness for speaker level input
  • Line In Connections: two gold-plated RCA jacks

Additional Specs

Best Frequency Response: 10Hz to 30kHz, -0.5dB

Fuse Rating and Type: two 30 amp blade fuses

Channel Separation: 93 dB

Warranty Note

Warranty: Amplifiers made before January 2001 carry a 1 year warranty. Units made during, and after, January 2001 carry a 3 year parts and labor warranty. All the units currently being sold by Crutchfield were manufactured after January 2001, so they are covered by the 3 year parts and labor warranty. The production date of each amplifier can be determined using the serial number; the first digit in the serial number indicates the year in which the amplifier was made. If the first digit in the serial number is "1", or higher, the amplifier carries a 3 year warranty; if the first digit in the serial number is a "0", the amplifier carries a 1 year warranty.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.