This page deals with the several possibilities to amplify the Kemper Profiler.
Let's have a look at the approaches that can be discussed here:
FRFR or Non FRFR
FRFR (= Full Range Flat Response)
FRFR takes full adantage of the amps and cabs in the Kemper Profiler. You choose a rig in the Kemper Profiler including its cab. This will be amplified by the FRFR system in the most neutral way. FRFR lets you go from a 1x12" to a 4x12” setting (and everything in between) with the flick of a switch. While FRFR is theoretically the way to go with a modern profiling system there are also potential drawbacks, at least for some users. These drawbacks have often to do with the subpar quality of the speakers used (a very cheap sounding PA or monitor system, while theoretically FRFR, will color the sound in an unpleasant way). When going the FRFR route, it is recommended to use a decent speaker system. Listen before you buy. The other drawback is that some users simply have a hard time connecting to the fact that with FRFR you actually hear the miked version of an amp, not the amp in the room. There is some getting used to this fact, but given that every guitar sound you ever have admired was a miked and recorded one as well it's a logical thing to do.
Non FRFR is basically a conventional setup with a neutral amp and guitar speakers with their limited bandwith which will color the sound in a certain way. This is mostly suited to players who want to use the Kemper Profiler more like a conventional guitar rig, don't need that much variety or don't want to do the paradigm shift of going FRFR. As most of the sonic information s in the cab portion of the profile, Kemper introduced the CabDriver feature in firmware 1.5. CabDriver was introduced to keep the tube power amp characteristics and speaker action of the original amp and translate it to a conventional speaker cabinet. The addition of this feature minimized tweaking of sounds suited for guitar cabs.
Q: Tonight, I ran the Profiler into my effects return on my tube amp. Turned off cabinet on the profiles (and locked it there) and it sounded pretty freaking good. I guess YMMV depending on the type of amp. The problem is, with that setup you don’t have control over the amp, it’s just a vessel, so no control over volume or any type of EQ to cater for the amp being "backline".
A: 0100000 - You could also use the Profiler’s Monitor output. Check the box Monitor Cab is Off in the Output section and you're done. This way you don't have to lock the cabinet off and, more importantly, you can still send your 'full' signal to the FOH, PA in the rehearsal space etc. via the main outs.
There are also many guitarists that use the 'best of both worlds', meaning they go to FOH with cab switched on and prefer a traditional cab (cab switched off = CabDriver switched on) for their personal monitoring.
Powered or Non Powered Profiler
First decision you take when you go and buy a Kemper Profiler is the choice between powered and non powered versions of the Profiler. Your choice has some influence on how to amplify your instrument. Some of the questions involved: Active or passive speakers? Mono or stereo amplification? Options to retrofit a power amp in a non powered Profiler?
Note: the Powered Profiler have only a mono amplifier.