Kemper Profiling Amplifier PowerRack

Amplifier 19" VersionSince the introduction of modeling technology into the guitar amplifier world, guitarists have been able to access a variety of sounds and effects with relatively little effort.

But what if you want to take your own favorite sounds instead of the manufacturer's sound specifications? Prior to the release of the Kemper Profiling Amp, there were not many alternatives: either, as before the digital revolution, they dragged their entire equipment from place to place, or tried to adapt the modeled sounds of the modeling amp as far as possible to their own desires.

Kemper breaks new ground here. Instead of using predefined emulation of different amplifier models, the Profiling Amp (Nomen est Omen) creates an exact image of the sound set on the amplifier together with the connected speaker and microphone. This combines all the personal favorite sounds in one device. In addition, the sound profile can be edited with various floor effect emulations, master effects, equalizer, and so on. A separate amp fleet is not a mandatory requirement, because the Profiling Amplifier is already equipped with a large number of classic amplifier profiles. In addition, a large Kemper community has now established itself in the world where sound profiles are exchanged over the Internet.

  • Power rack version with 600 watt class D amplifier
  • Power: 600 watts into 8 ohms, 300 watts into 16 ohm
  • Format: 19 "/ 3 HE
  • Dimensions (W x H x D): 48.3 x 13.9 x 22 cm (as the rubber feet should not be removed for ventilation reasons, a min. 4 U rack is required)
  • Weight: 6.18 kg
  • Colour: Black


  • Mic input
  • Line In
  • Alternative input
  • Direct Out
  • Monitor Out
  • Master Out (jack & XLR)
  • S / PDIF digital input and output
  • Midi In / Out / Thru
  • 2 x Footswitch (jack)
  • Network and USB

Further information

Design 19"
Tube(s) Yes
Amp Modeling Yes
Effects Yes
Headphone Output Yes
Direct Out Yes
MIDI Interface Yes
Integrated Expression Pedal No
Connections for Pedals or Switches Yes
Aux-Input Yes
Integrated Tuner No
USB-Port No
Drum-Computer No
43 customer ratings:
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20 written ratings Read all reviews

Kemper PowerRack 600

Keith6629, 12.12.2013
Early days yet but this is my experience so far.
I was interested in the concept, read the reviews and had been considering getting a Kemper to profile my Mesa LoneStar Special to use as a backup for gigs (or replace it completely because the Kemper is much lighter and should be more reliable). My LSS actualy blew up a few weeks ago so that pushed me to buy the Kemper anyway. The user interface took me some time to get used to - after a few days I am still not proficient - even though I have worked in IT since 1980 - it's not that easy. An Ethernet or USB connection and a Web UI would probably help a lot here.

I have profiled my LSS Preamps and the Kemper gets very close but is less "airy" with slightly less "sparkle" - this is just a/b through the desk into headphones. This has nothing to do with power amp/speaker coupling yet, which I have not tried to emulate or profile (that's a job for a soundproof room next week). The touch reponse and dynamics of the profile were impressively close to the LSS preamp once it's gone through a few stages of refinement. I found that by playng single notes rather than chords as instructed during the refinement process it got closer to the orginal dynamics. The effects are excellent.

I tried the PowerRack for the first time at rehearsal this week. I was using one of the stock AC30 HW profiles included in the Kemper. It sounded good but I was disappointed to find that the specified 600W RMS supposedly "on full" was not as loud or as punchy as my repaired LSS running close to it's max at 35W RMS. These were both tried using the same Celestion 8 Ohm 75W 1 x12 Black Shadow speaker. I actually need an amp as loud or slightly louder than the LSS to keep up with my drummer so, until I have figured out what I am doing wrong with the Kemper (although it is undoubtedly a *very* useful piece of recording kit), it looks like the Kemper PowerRack will remain only as an emergency backup for live work and my "poor ol' back" will continue to suffer the weight of the LSS as my main rig.

Note that I fitted the Kemper into a 3u rack case to protect the front and rear panels for transit. The jack sockets on the rear are plastic and in my opinion are a bit flimsy for live work. I accidentally broke one on the bench before I had even powered it up for the first time and I am a 7-stone weakling - not a gorilla (maybe that's why I think the LSS is heavy). I chose the rack format over the head because I dislike the dimensions of the head. The case of the head is definitely tougher than the rack but I think the Powerhead probably uses exactly the same sockets on the rear - so you have been warned, take extra care!
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The best money on an amp I've ever spent!!

Anthony8336, 16.12.2014
After much research I finally took the plunge and purchased the power rack version of the Kemper profiling amp and I have to say that I'm totally thrilled with it.

I play bass guitar in a busy cover band and I wanted to use this exactly as I would a standard bass guitar head into a pair of RS TC Electronic bass cabs.
I had concerns initially as the manual says that it's to be used with cabs rated at 8 and 16 ohm and as mentioned above I wanted to run it with two 8 ohm cabs which means it would be running at a 4 ohm load, potentially causing damage to the power amp. I was assured that it would be ok though, as there is a large online resource, WIKPA and a user forum that will basically tell you anything you need to know and more.

The forum also has a rig exchange section that contains real rigs that have been profiled by users ranging from bedroom guitar players to professional recording studios and the the quality of rigs range from good, bad to awesome there is even a rating system added on there to score the rigs you try. You are also encouraged to profile any of the amps you own and add them to the exchange.

The bass rigs added in the latest firmware update are awesome too, been using some of them to play live and have dialled in some of the best sounds I've ever used.

There are countless high quality effects on this thing off all different types, including a pitch shifter that enables me to play a standard tuned guitar in drop C tuning on some of the heavier style of song my band plays live. No tracking issues at all. I was amazed.

To conclude.

This thing can accurately profile any amp in existence. Has all the high quality effects you can ever need. Is light to carry to and from gigs or to the studio.

What's there not to love.
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