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Behringer ULTRATONE K450FX Keyboard Amp/PA System

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The super-compact, self-contained Behringer ULTRATONE K450FX is a perfect keyboard amp or PA setup for public address systems, keyboards, voice, or v...Click To Read More About This Product

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Big-amp features, small-amp convenience.

The super-compact, self-contained Behringer ULTRATONE K450FX is a perfect keyboard amp or PA setup for public address systems, keyboards, voice, or various drum/backing machines. 45W of power are handled confidently by a headroom-rich 10" speaker, making sure that you can faithfully reproduce a broad repertoire of signals. Behringer includes features usually found in much larger amps: 24-bit digital FX with 100 hot presets; FBQ Feedback Detection System; 5-band EQ section; CD input; headphone output; and full 3-channel operation with separate volume controls and FX sends per each channel plus an additional XLR mic input for connecting dynamic microphones.

  • Powerful 10'' speaker for ultimate sound reproduction
  • Integrated 24-bit digital FX processor with 100 awesome presets including reverb, chorus, flanger, delay,
  • pitch shifter and various multi-effects
  • Revolutionary FBQ Feedback Detection System instantly reveals critical frequencies
  • Full 3-channel operation with separate Volume and FX Send per channel
  • Additional XLR mic input on Channel 1 for direct connection of dynamic microphones
  • Dedicated 5-band graphic EQ for awesome sound shaping
  • Line output for direct connection to your mixing console
  • Gain section with FX Return level and Master Volume
  • Subwoofer output for ultimate low-end power
  • CD input allows you to play along to your favorite music
  • Separate headphone output”perfect for quiet practicing
  • Integrated 35-mm pole socket for stand mounting and use as PA System
  • High-quality components and exceptionally rugged construction ensure long life
  • Conceived and designed by Behringer Germany
  • Inputs:
  • Line In 1 - 4 1/4" TS connector
  • Input impedance approx. 30 kOhm balanced
  • Input impedance approx. 20 kOhm unbalanced
  • CD In/Aux In RCA connector
  • Input impedance approx. 20 kOhm unbalanced
  • Mic In 1 XLR connector
  • Input impedance approx. 2 kOhm balanced
  • Outputs:
  • Headphones connector 1/4" TRS connector
  • Line Out 1/4" TS and XLR connector
  • Output impedance 1/4" TS connector: approx. 150 unbalanced
  • XLR connector: approx. 300 Ohm balanced
  • Output impedance approx. 150 Ohm unbalanced
  • Sub Out 1/4" TS connector
  • Output impedance approx. 150 Ohm unbalanced
  • EQ:
  • Type Graphic EQ with FBQ Feedback Detection
  • Frequency range 63 Hz / 250 Hz / 1 kHz / 3.5 kHz / 12 kHz
  • Bandwidth 2/3-oct.
  • Control range +12 to -12 dB
  • Digital Effects Processor:
  • Converters 24-bit sigma-delta, 64/128-times oversampling
  • Sampling rate 40 kHz
  • Loudspeaker:
  • Type 10'' Bugera speaker
  • Input impedance 4 _
  • Power:
  • General export model 120/230 V, 50 - 60 Hz
  • Power consumption approx. 75 Watts
  • 100 - 120 V:
  • 2.5 A H 250 V
  • 220 - 240 V:
  • 1.25 A H 250 V
  • Mains connection Standard IEC receptacle
  • Dimensions:
  • 16 1/2" x 17 3/8" x 11 3/4"
  • Weight: 32.19 lbs
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BehringerULTRATONE K450FX Keyboard Amp/PA System

(based on 1 review)

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Reviewed by 1 customer

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(31 of 225 customers found this review helpful)


Nice amp for practice or gigs


from Northern Illinois

Site Member

Comments about Behringer ULTRATONE K450FX Keyboard Amp/PA System:

I play in the orchestra pit for local community theater groups. I needed an amp that would fit into a small space and still be heard. It's both compact and lightweight. It has three inputs with individual volume controls so I don't need a sub mixer. The 45W amp and 10" speaker put out enough power to keep up with other musicians and cut through for solos. It has a built-in effects processor. This might be useful for vocals or miking an acoustic instrument. The 99 effects are a collection of reverb, chorus, flanger, delay, and multi-effects with preset decays, delays, etc. as appropriate. It doesn't have a bass port. Instead, it has a vent in the back. As a result, low frequencies tend to roll off a bit. However, there is an output to connect to a subwoofer. Another nice feature is that there is a line out jack on the back so you could connect directly to a mixing console. Be sure to visit the Behringer website for a detailed description and specs.

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