BHA-1 in the house! After exhaustive reading and research I bought the BHA-1 on faith, which is very, very rare for me to do. I have never listened to a dedicated headphone amp before today when I listened to my BHA-1 for about an hour. 'phones are Beyerdynamic DT250-80 which to me seem very neutral. I only recently started listening to headphones and didn't want to spend a lot without auditioning. I had a chance to compare the DT250-80, DT250-250, DT880 and a Sennheiser model of which I forget the number all at the same time and was impressed enough with the 250-80 that I purchased a set.
I have been listening via a B60. Initial findings reveal the BHA-1 is cleaner, crisper (not brighter), more detailed, has fuller bass, better separation, more sense of space around the instruments and what I like most of all, the improved sense of attack and speed of the music. (Did I leave anything out?) Inputs and outputs are unbalanced. I have balanced cables on order for the source and I have also ordered xlr to rca adapters so I can use the BHA-1 as a preamp. More to follow once the adapters arrive. I know several are curious about the BHA-1 as a preamp.