The Great River MP-2NV is a dual channel microphone preamplifier that is simply a two channel version of the Great River ME-1NV as it has the same configuration. This is an analog unit that has XLR connections in the back and has 1/4 inch inputs in the front for plugging directly into this. This is indeed a rack mountable piece of outboard gear and will only take up a single rack space.
The configuration of the Great River MP-2NV is easy to follow as there isn't anything unusual to be seen here. Each of the channels simply have knobs for gain and output level and buttons for polarity, phantom power, impedance and loading. Each also has a meter for both the input and the output levels. I can't say that this is hard to manipulate at all and I think that most people won't have any problems operating this pre amp. I can't say anything about the manual as I have never needed to look at one.
The sound quality of the Great River MP-2NV is exactly what you would expect - it is outstanding. It has a great deal of warmth and clarity and it definitely portrays an accurate picture of the signal that you sending to it, whether that is with a microphone or direct. I would say that the MP-2NV is pretty much suitable for use with any application in terms of instruments as I have had success using it with just about all of the applications that I have used it with. The bottom line is that it is just a good mic pre and this will translate to whatever you use it with.
I've been using the Great River MP-2NV for about a year or so and I've always been extremely pleased with the sound that this has. It has a very authentic sound and is a great pre to have around even if you have a console as it will give you another option to go to. Of course with great quality comes a price and for this reason this isn't a cheap set of pres. I believe however, that this is a good deal even if it is out of the price range for most home studio owners. Overall, the Great River MP-2NV is a special pre and is a great all around choice in terms of stereo mic pres.