Behringer Ultratone K450FX 45 Watt 3-Channel Mixing Keyboard Amp


81 out of 100. Incorporating 250+ ratings and reviews.

Street Price: 

Behringer Ultratone K450FX 45 Watt Keyboard Amp

Meta Analysis Overview

Our rating of 81/100 is based on analysis of 250+ 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 Ultratone K450FX is both a keyboard amp and a small PA system with 3 independent stereo channels, an XLR input for a dynamic mic and onboard effects including reverb, delay and more.

It is also designed to be used as an amp for electronic drums, and some acoustic guitarist / singers also use it.

Behringer have also included their FBQ Feedback Detection System which provides a control knob for eliminating feedback at specific frequencies.

Key Features:

  • Output Power: 45 Watts .
  • Number of Channels: 3.
  • Inputs: 3 x 1/4", 1 x XLR, 1 x RCA (Stereo).
  • Outputs: 1 x 1/4" Stereo Headphone Out, 1 x 1/4" Speaker Out.
  • Speakers: 1 x 10" Woofer.
  • Tone Control: 5-band EQ.
  • Frequency Response: Not specified.
  • Size: 17.375" x 16.5" x 11.75".
  • Weight:32.19 lbs.
  • Manufacturer Warranty: 3 years.


The most common positive comment from customer reviews is that this little amp is great value for the money. The onboard effects also get many positive references.


There weren't any consistently reported complaints. A couple of people said it would have been better if more detailed control of the effects were available instead of just the 100 presets it has.


If you need a versatile amp with effects then this is a reasonable option. On the other hand, there are more highly rated options which you can see in our guide to The best Keyboard Amps.