Best keyboard amp – Behringer K900FX

This article will provide you with all the necessary information about the Behringer K900FX. If you are interested in buying the Yamaha Behringer K900FX or you just want to know more about the keyboard amp, you should keep on reading.

Product Description

The Behringer Ultratone K900FX is a 3-channel, 90-watt keyboard amplifier and small PA in a rugged bass-reflex enclosure, housing a 12″ woofer and a custom 1″ horn-loaded tweeter. In addition, it features built-in 24-bit digital effects, processing with 100 presets, feedback detection and suppression circuitry, a master 5-band graphic EQ and an XLR input for dynamic microphones.


The prices can vary depending on the website you are buying it from, but mainly it stays between 180 and 250 euros. You can check the latest offers here!


+ 12-inch Woofer and 1-inch Tweeter

+ Onboard, 24-bit digital FX processor with 100 pre-sets

+ Integrated 5-Band Graphic EQ

A common comment in positive reviews is that this amp sounds clean and crisp. Many reviewers were satisfied with the volume it produces. 


A small number of people complained that it wasn’t loud enough for them but they were part of a small minority of customer reviews. One reviewer pointed out that he believes this amp only has 30 watts per channel.

Is Behringer K900FX Worth it?

Combining a keyboard amp and a PA system in one package, the Ultratone K900Fx by Behringer has it all. It offers three separate channels, as well as 90-watts of power, providing you with outstanding value-for-money when the affordable price is taken into account.

In-Depth Review of the above articles


Flexible ins and outs

Expand your sound by adding more Ultratone amps, or connect a subwoofer via the Sub Out jack. The K900FX also a 1/4″ out to go to your mixer or stage snake. A handy aux input, via RCA jacks, lets you hook up MP3 players, CD players, and more. Each channel on the Ultratone K900FX features 1/4″ inputs, and the first channel has an XLR input for a microphone. A headphone jack was incorporated for silent practising. This a perfect amp for a keyboard player with multiple keyboards.

EQ and feedback suppression

The Behringer Ultratone K900FX features a 5-band EQ so can really dial in that perfect sound. Make your performance shine with onboard effects like reverb, delay, chorus and more. To fight the dreaded feedback, Behringer has included the proprietary FBQ Feedback Protection System to ensure problem-free gigs.

Specifications of Behringer K900FX:

  • Dimension

Width: 429 mm

Depth: 492 mm

Height: 299 mm

  • Weight 18.8 kg
  • Speaker Size

1 x 304.8 mm, 1 x 25.4 mm

  • Total Power


  • Inputs

3 x 6.35mm, 1 x XLR, 1 x RCA (Stereo)

  • Outputs

2 x 6.35 mm

  • 12″ woofer, 1″ tweeter
  • 90W
  • Subwoofer output
  • FBQ Feedback Protection System
  • Onboard FX
  • 3 channels
  • XLR input
  • Aux input
  • Headphone out


This amp has a professional-grade, 12-inch, BUGERA woofer, as well as a 1-inch tweeter. In addition, the drivers deliver gorgeous sound, which keyboardists and vocalists adore due to the clarity that they offer. They’re also remarkably powerful, with 90w being more than enough for a small, live gig.

Furthermore, this keyboard amp features an effective ‘Feedback Detection System’. Once again, this is a great feature for live gigs, as you won’t need to worry about nasty feedback interrupting your performance.

Additional Features:

  • Ultra-flexible 90-watt three-channel pa system/keyboard amplifier
  • Powerful 12′ Bugera woofer and custom-made 1′ driver for ultimate sound reproduction
  • Full three-channel operation with separate volume and fx send per channel
  • Main section with fx return level and master volume
  • Cd input allows you to play along to your favourite music


The Behringer K900FX comes with a 3-year warranty.

Who Is Behringer K900FX Best For?

If you need to sing through your amp, as well as putting your instruments through it, then this is a good budget personal PA and Keyboard Amp combination. Due to its lightweight, you don’t have to worry about portability, so you can easily take it to different gigs and performances. 

What Do People Say About Behringer K900FX?

You can find some feedback and digital piano reviews on Amazon, Sweetwater and Thomann. A lot of people prefer buying their pianos online due to the better prices rather than in stores. Overall the Behringer K900FX has been rated on average 4.5 out of 5 stars on Amazon Review. 

Amazon Reviews #1

After much research on the internet, I had decided that the best type of PA system to complement my electric violin was that designed for a keyboard. Behringer amps seemed good value for money and so, with advice from my son (who is in a rock band), I had purchased the K900FX Ultratone 90W. At the lower sound levels, I can practice at home (if not using my earphones), and at the higher levels, I could perform in public. It is everything that I had hoped for – well-made, sturdy, not too heavy, the higher notes of my violin are not too “trebly”, and it has some good sound effects that I am still experimenting with.”

Amazon Reviews #2

“I searched for hours online trying to find a good amplifier for my keyboard. I wasn’t too sure about any of them as had been told by many other keyboard players that only keyboard amps are good for keyboards. This thing does the trick. It’s light enough to where I can carry it around and put it in my small trunk. The sounds are great you just have to find a setting that works for you. I use it with my Yamaha YPG 535 in a 15 piece horn and rhythm band and it sounds great. I have used it for a professional gig in a fairly large theatre and it had plugged into the PA system and sounded great. The power cord is a bit short so I recommend getting an extension cord.”

To get a better idea of how the piano sounds and looks like, we have provided you with a couple of Youtube videos, where you can get a quick piano and sound review.

YouTube Review #1

In this video, you will get a quick but thorough overview of the Behringer K900fx. 

Youtube Review #2

This video will demo you the quality and the different features the Behringer K900fx has to offer. In this video, you will mainly listen to the sound and power of the amp.

The Verdict: Is it Worth It?

If you are looking for an amp that ticks all the key boxes in terms of sound quality, power, and value for money, I suggest you purchase the Behringer K900FX. The Ultratone K900FX is yet another example of Behringer providing an amp with a higher power rating than their competition deliver at the same price level.

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