Comparison of Audio Horizons Preamplifiers

the 2.2 is a bit sweeter thanks to some careful parts selection (hi fi fuse & furutech gold IEC), but the 2.1 is a bit more dynamic (thanks to 2 trannys).

i'd think upgrading tubes (1 & 3) or coupling caps would be the best thing you could do.

I am in process of upgrading my 2.0nB with all currently available upgrades except transformers and will let you know what I think of the difference. Have also thoroughly enjoyed my AH