Bob, I have no reference with the AVM-2, only the AVM-20. From what I have heard, the AVM-2 has far greater reliability issues and bug type problems than the AVM-20 has experienced. You can also download patches and upgrades for the 20 via the internet...not sure if that capability exists on the 2. Also, in terms of sound quality, I have heard the 20 sounds significantly better and much quieter than the 2 for CD playback. For DVD perfomance, I heard the gap is much smaller, but there is a significant improvement for the 20 over the 2 in terms of 2 channel performance. Supposedly the 20 is a complete redesign over the two...all the internal components in the 20 were significantly updated and bettered for the 20 than the 2...from transformers, power supplies, DACS, everything.