No need same circuit on 2000 and 1000 the 2000 has a balanced input that's it. The 2100 is not better than the 2000 it uses mosfets instead of Jfets. Mosfet has more of a tube like sound. Jfets been around longer some think they have more detail. I've heard both amps I got my 2000 for 1699.00 brand new. To change to the 2100 notice I said change not upgrade would be a minimum of 1k or more for a different sound not better your mileage may very. 1k can buy a lot of records maybe you have old speakers there are a lot of good speakers around that price point. The Martin Logan 15 or 35 or SVS ultra prime kef ls50's. You could get a Mac mini and a nice Dac music fidelity v90 and get Audirvana stream tidal and your library. Audirvana At is incredible much bigger upgrade than changing out an amp. Point is these are bigger upgrades IMHO than changing from a 2000 to a 2100. Heck you can even get a great turntable at that price difference. And putting goo on your innards of your amp won't get you there either. Lmao if you know what I mean.
