I briefly tried out my BDP105 as a preamp -- but since I am doing multichannel, I had to run the 6-channel SE outs to my Parasound Halo A51. The A51 has a reputation for sounding better when its balanced, XLR inputs are used, and this seemed to affect my results. The sound was a bit more coarse or harsh, and emphasized the high-frequency part of the spectrum. This had the immediate effect of increasing the "presence" and "air", but ultimately I didn't find it pleasant or well-balanced. (I did not experiment with the Oppo's balanced outs directly into the A51.)
So I went back to using my old Anthem AVM20 as an analogue preamp, and running its balanced outs into my Halo A51. This sounds better to my ears. The negative effect of running it through a preamp seems to be offset, in this case, by the positive influence of sending a balanced signal to this particular amp.
I am thinking, though, that I will replace the AVM20 with a Halo P7 and probably get a still cleaner, nicer signal from Oppo to amp to speakers.
So I went back to using my old Anthem AVM20 as an analogue preamp, and running its balanced outs into my Halo A51. This sounds better to my ears. The negative effect of running it through a preamp seems to be offset, in this case, by the positive influence of sending a balanced signal to this particular amp.
I am thinking, though, that I will replace the AVM20 with a Halo P7 and probably get a still cleaner, nicer signal from Oppo to amp to speakers.