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Sound Quality

The JMP-1 has a handful of good sounds. I've found that the main sound is very unique and can't be changed too much. I've used it with an ADA tube poweramp and a couple of 2-12 Celestion loaded cabinets. I use US Strats and ESP strats with hums mainly. You can get a good Metallica type sound out of it, or a more well rounded GNR type tone out of it. I personally like a lot of midrange in my tone for a funkier tone and for leads that cut through the mix better. I'm not in to that scooped mid sound. I recently sold it to buy a Triaxis 50/50 setup. I miss the JMP-1 for a few reasons -- it was easier to program and it had a better direct out and speaker simulator signal for recording. However, the Triaxis sounds warmer and thicker. The JMP-1 does one great distortion sound, the Triaxis does about three great distortion sounds, in my opinion. The JMP-1 has clean and fast channel switching, the Triaxis has some latency in switching (I think due to all-tube circuitry versus the tube-hybrid circuit of the JMP-1.) The significant difference I've noticed between the two is that the JMP-1 is bit more sterile than the Triaxis. By sterile, I mean that the JMP has a refined crispness and consistency to it that is great for metal types. The Triaxis, however, has more rawness to its tone -- it has an uncontrolled feel to it that gives it more character and lends itself to more interesting guitar styles and tones. That's just my general take on the two.

Reliability/Durability

The amp never malfunctioned over the 8 or so years I've had it.

General Comments

If you need MIDI channel switching and want a dependable rack unit for under $700, this is a great preamp. If you don't need MIDI, but want Marshall tone, get a Marshall head or combo. For the money, the JMP-1 is better than anything in its class, tube or not. If you can afford the Triaxis, I'd recommend it instead -- you'll get more distinctive sounds and wider tone pallette.




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