Behringer Ultracoustic ACX450 45-Watt 2-Channel Acoustic Guitar Combo Amp (Discontinued)


91 out of 100. Incorporating 200+ ratings and reviews.

Street Price: 

Behringer Ultracoustic ACX450

Meta Analysis Overview

Our rating of 91/100 is based on analysis of 200+ sources comprised of online reviews and discussions. Under the Pros and Cons headings below you'll find a condensed analysis of what those owners and users have been saying. Feel free to ask questions or add your thoughts in the comments section.

The Behringer ACX450 is a 45-watt 2 channel combo amp for acoustic guitar. The first channel is for guitar/instrument and the second is for Mic/Line input.

It doesn't have all the features of more expensive amps, there's no phantom power, FX loop, headphone jack, DI or Line outs, but based upon the reviews it does a fairly good job of being a straight-up acoustic amp with a low price.

When you turn the FBQ feedback control on the LEDs on the graphic EQ sliders light up to show you which frequency band is feeding back allowing you to turn down the specific band causing the problem.


  • 2 channels
  • 5 band EQ on both channels
  • FBQ feedback indicators
  • A separate built-in effects processor for each channel which includes Reverb, Delay, Chorus, Flanger, Phaser, Tremolo and more


  • Power Rating: 45 Watts
  • Amplifier Type: Solid State
  • Channels: 2
  • Master Volume: No
  • Inputs: 1x 1/4" Instrument, 1 x XLR, 1 x 1/4" Line
  • Outputs: None
  • Controls: Both channels have gain control, 5-band EQ, effects selector, effects level, FBQ feedback switch, There is also a level control on the back for the CD input.
  • Speakers: 1 x 8" dual cone
  • Weight: 29.1 lbs
  • Dimensions: 17.9" x 8.3" x 16.3"


"Great value for the money" or words to that effect are common in positive reviews. Many owners also say it works well for both practice and performing in small venues.


The lack of additional features did cause several complaints but in my opinion these are unwarranted because this is a budget amp, not a high-end Fishman or AER - you get what you pay for. There were also a few people who said the mid frequencies could be crisper.


If you're on a beginner or have a limited budget then this is a good choice, in fact it was on our recommended list from July 2016 until November 2017. The reason we're not currently recommending it is because it's ratings have gone down slightly over the last 15 months which other acoustic amps have improved their ratings. For a list of our current recommendations see: The Best Acoustic Guitar Amps - Under 50W, 100W & 100W+.