I am hesitant to post as my experience is limited. However, I own the XA25. It is a very transparent amplifier. Search the forums and your will find that those with much experience note that it should not be compared in sonics to other Pass products. I have not heard the AHB2, however was interested in it and from my searches I gather it might be more analytical in it's presentation. Unless you have a very large room and listen very loud the XA25 has the power. I use mine with 91dB speakers (Tannoy Sterlings).
