The 2805s have a different balance than the 2905s. They have a warmer tone, which I suspect comes from the fact that they are much smaller in terms of size, and the acoustic center of the speaker is below a typical seated listener. The larger room has a lot of absorbing material (two large overstuffed sofas, carpeting etc.), which helps. The 2905s can sound a bit overbearing with the “wrong” electronics, and they sound much better with tubes. I use two very large Audio Research Ref 210 tube amps with the 2905, which use 8 KT 120 tubes per channel. That really makes the larger 2905s sing.