Flat out fantastic.

I knew I would be happy with this thing, I just didn't know I would be THIS happy. Everyone knows this thing is in Geddy's rack, so obviously it's a quality piece of gear with great sound. I bought it based solely on it's reputation. It literally made my tone come alive. I don't know how else to describe it. You need to really take some time with it and make tiny adjustments to the knobs as you tweak - a little bit really goes a long way. They didn't skimp on the back panel either - check out the connectivity options. I run two XLR's to my PC interface; effected (sansamp tone) and un-effected (dry - straight from the bass) so I can record two separate tracks to play with later, then I have yet another line going to my power amp/cab for rockin' out. I can go back and forth without having to play cable monkey anymore!

A very well engineered product

I am a working bass player. Over the last 40 years, I have played through numerous types of preamps, amplifiers (tube-SVT and solid state) and processing schemes.
I was very suprised at the warmness and tone control of this Sansamp product.
I have only used it for live performance; however, I am completely satisfied with the unit's operation in this enviroment.
I find when arranged with just a simple preamp/compressor/solid state amp configuration that I get a versital and solid stage rig. Again, that warm tube amp sound and easy tone control with virtually no noise in a light weight package.
In short, I recomend it.

What a difference in my live sound..!!

I strongly recommend this Sansamp preamp to any bass player that is gigging. I had an immediate response from my fellow musicians as well as the audience. Sounds like 'sonic meatloaf'..!! ( I made that up).. I am definitely going to be using this rig on both the local and national music scenes...very happy with this product..!!

SansAmp RPM

eliminates the tone problems (or the lack thereof) in using a direct box and using my mixing board tone controls which make the Bass guitar signam muddy at best The SansAmr RPM allows for a Clear signal with no overdrive though overdrive is available if needed.

Can't be beat!

The RPM is just an incredible unit. Looks like it would be complicated, but is not at all. Very intuitive to get great tones. Sweepable mids are the best - you can literally dial yourself into the mix and hear when you hit the magic spot. Worth its weight in gold. Been playing almost 30 years and never was so satisfied with anything in my amp chain as the RPM.

Excellent

If you (like me) are not willing to drag a 60-pound rig around and still sound good, you should give this rack a shot. Among the many good things I could say about it the best one by far is that it is really easy to get a good tone out of it with just a few tweaks. Already tested it with lots of amp heads (some pretty ugly sounding ones I should say) and I always can manage to get a good tone. The guys I play with noticed the difference immediately: first because I used to be the guy that took forever to get a usable tone, now I spend a minute or two to get it, second because the tone I get can really cut through the mix. The sweepable Mid control is a blessing!
It´s been 4 months now since I bought it and I can only say great things about it. Ok, this is not a SVT Classic rig, but it sure does not weigh as much and still can deliver a lot!

Incredible!

Been playing bass for 20+ years - I've own lots of amp & preamps, but nothing like this. I don't make that comment lightly. You owe it to yourself to give one of these a try. In all sincerity, it may just be the biggest improvement to your tone you'll ever make. This preamp is the most dramatic improvement to my tone than anything I've ever tried in over 20 years. This unit replaced an Ampeg SVP-Pro all tube preamp. The SansAmp RPM just plain sounds better, and I don't mean by just a little - far & beyond better. You couldn't hand me the Ampeg back for free, I'd never use it again. What is equally amazing to me is that just between the 3 bands of EQ (bass, treble, mid w/mid-sweep) I can get such an amazing variety of tones. This is coming from a guy who has always ran a fully parametric 5-band EQ in his rig. Trust me - this thing is flat out incredible. Just running through the circuit and using the 3-band EQ (whether you decide to mix in some Drive or not) will do it's magic for your tone. The main difference between the Ampeg SVP Pro & the RPM is that the RPM emulation encompasses the FULL Ampeg SVT tube sound (power tubes, not just the preamp tubes). Whereas the Ampeg, with only preamp tubes, only gave a taste of the full SVT tone. Huge difference. The sheer amount input, outputs, effects loop w 50/50 mix, Blend control & overall signal routing offers total flexibility to novices up through studio & gigging pros. The beauty of the SansAmp is that there are no tubes to mess with, worry about or replace and - NO TUBE HISS like with the Ampeg. Geddy Lee recently started using the RPM model (over his RBI model) due to the greater tone capabilities that the semi-parametric Mid-sweep offers. I understand that the RPM also offers more overall gain when using the Drive function than the RBI unit. If your looking for a major improvement in your tone & to obtain the classic Ampeg SVT tone, try out the SansAmp RPM.