Motion Sound KP-500SN - 500W 2x12" Keyboard Amp

500-watt Stereo Keyboard Combo Amplifier with XLR and 1/4" Inputs and Outputs, 3D Expander Control, 2x12" Speakers, and 4x3.5" Horns
Motion Sound KP-500SN - 500W 2x12
Motion Sound KP-500SN - 500W 2x12
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Motion Sound KP-500SN - 500W 2x12" Keyboard Amp
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Make Your Keyboard Sound Big in Any Venue!

The Motion Sound KP-500SN stereo keyboard combo amplifier lets you take advantage of the dimensional, lush sound field made possible by many modern keyboards. Though it's very lightweight and compact, the KP-500SN gives you an amazingly big sound that's great on any stage! An onboard proprietary 3D expander control expands the stereo image into a fantastic 3D sound that you just have to hear to believe. At 250 watts per channel, this amp has plenty of power, and an array of inputs and outputs make the KP-500SN great for any setup.

Motion Sound KP-500SN Stereo Keyboard Combo Amplifier at a Glance:
  • Enough power to fill the stage
  • Designed for dimensional sound

Enough power to fill the stage
The KP-500SN 500-watt stereo combo keyboard amp makes a great addition to modern stereo keyboard rigs. The KP-500SN's 500-watt capability is designed to handle large live venues.

Designed for dimensional sound
Motion Sound built the KP-500SN with an angled cabinet that projects and dramatically widens the stereo keyboard sound. Plus, the sonic experience can be enhanced further utilizing Motion Sound's proprietary 3D expander control. This takes the stereo sound and turns it into real 3D imagery far beyond the sound delivered through typical flat-front, forward-facing mono and stereo enclosures, creating dimensionality and depth for audiences in large rooms and live venues.

Motion Sound KP-500SN Stereo Keyboard Combo Amplifier Features:
  • 500 watts (250 watts per channel)
  • Two stereo preamps with Volume, 3D Expander, Bass, Mid, and Treble controls
  • Two pairs of 1/4" inputs on each channel
  • Master Volume control
  • Master low bass control
  • XLR mic input
  • XLR left and right outputs
  • 1/4" mono output
  • 1/4" subwoofer output
  • DIN slave amp output
  • Two 12" Eminence Beta-12A speakers
  • Four 3.5" ferro-cooled horns
  • Dimensions: 18.75" H x 24.5" W x 16.75" D
  • Weight: 58 lbs.
The Motion Sound KP-500SN brings powerful performance and 3D sound to your stereo keyboard!

Additional Media

Keyboard Amp Buying Guide

Tech Specs

Speaker Size 2 x 12" Beta-12A, 4 x 3.5" ferro-cooled horns
Total Power 2 x 250W
Inputs 8 x 1/4" (two stereo pairs per channel), 1 x XLR (mic in)
Outputs 1 x 1/4" (mono), 1 x 1/4" (sub), 2 x XLR (left, right), 1 x 5-pin DIN (slave out)
Frequency Range 45Hz-17kHz
Enclosure Material Poplar
Mounting Options Floor
Height 18.75"
Width 26.25"
Depth 16.75"
Weight 58 lbs.
Manufacturer Part Number KP-500SN

Customer Reviews

Based on 19 reviews
Write your review

Love This Amp!

Without a doubt, this is the best keyboard amp I have ever used. Puts all my other keyboard amps to shame, and I love the fact that it is a stereo amp. Beautiful sound and lots of power. My neighbors may not always like it, but it was the perfect addition to use with my extensive synth collection. I had one small issue when it arrived: most of the control knobs were floating loose in the box, with a few missing. As is always the case with Sweetwater, they got on the horn to Motion Sound and got a fresh batch of knobs out to me ASAP. While this amp is heavy to carry or move around, it is a beast in the performance department and well worth the weight and cost. Nothing else I've seen or heard even comes close. I truly appreciate all the support and care Sweetwater affords its customers, and especially appreciate Carson McClain, my sales rep. Carson is knowledgeable and always ready to help or make suggestions. He's never steered me wrong.

Great Keybpoard amp

Great sounding Stereo Amp! No Need to say more
Music background: Auralwizard

Motion Sound KP-500Sn - the HOLY GRAIL of sound for the gigging keyboardist

I received the motion sound kp500sn about 2 weeks ago. This is the FIRST amplifier that I have ever had that was only limited by the quality of the sound that is input to it! The frequency response, control, richness, power and stereo sound is outstanding. It is very clean, bass to high response is excellent and it has the controls available to tweak to taste. I am currently running Pianoteq, Native instruments B4, Lounge Lizard rhodes, Omnisphere, and Sampletank from a notebook. WOW! The quality is amazing. The stereo expander is great for the piano, tremelo on the rhodes and the leslie emulation of the B4. For a while I gave up on keyboard amps and started using 2 peavey pr15a's to get a great, flat, full range rich stereo keyboard sound. Other keyboards amps were mono and did not offer the rich, flat response I needed. The kp500sn has raised the bar and set a new standard. It is also light (50lb) and has a set of wheels that are great for long hallways and big rooms. I have played keyboards for over 45 years and can highly reccommend this amp to EVERY keyboard player. It's worth every penny and will last you for years. I have NO criticism of this amp. My jazz trio gets great feedback where ever we play and I know that the kp50osn sound quality is a part of it
Music background: Professional Keyboardist and Pianist.

the best keyboard amp I've ever heard!

The Motion Sound KP-500SN stereo keyboard combo amp arrived on Friday and sounds fantastic. I ran my Yamaha Motif XS into the amp and tested out my favorite patches, especially the Full Concert Grand sample of a 9' Yamaha CFIIIS grand piano and was blown away with how real and accurate it sounded compared to an actual acoustic piano. This Motion Sound amp is by far the best amp I've ever used, and now I don't know why I suffered so many years with inferior mono keyboard amps from Roland, Alesis, and Behringer. I'll finally be able to enjoy playing jazz piano gigs with this setup instead of cringing and being forced to switch to a Fender Rhodes patch just to get a decent sound that doesn't annoy me. I'm very happy with my purchase!
Music background: Pro Musician

A small(ish) amp with very big sound!

I play guitar & guitar synth in a techno-metal band and our following is getting quite sizeable thus the need to upgrade for bigger venues. The plan WAS to aquire better stage volume with a (stereo) line out to the p.a. or to a slave. Well, with this thing, the line out/slave thing is now optional. It's sound is clear (deep) loud (tall) & huge (wide), the way the band describes it. For this kind of application, there's a lot of excellent solutions on the market. But, Motion Sound is without a doubt, the best keyboard/synth amplification available. Oh, and it's easy to pack around too. Cheers!
Music background: Semipro Musician (my night job).

Sweetwater Advice

Nick Schenkel

Playing a keyboard through a mono amp is like watching a 3-D movie with one eye closed; it totally misses the point. Motion Sound makes some of the best-sounding stereo keyboard amps I've seen (or heard). You owe it to yourself, your keyboard, and your sounds to plug into one and hear what you've been missing.
See also: Keyboard Amps, Motion Sound, Motion Sound Keyboard Amplifiers