The Adcom GTP Series is downright terrible having poor (2) channel and a noisy background. The B&K Reference 50 is great for HT full of Bells & Whistles; however, it comes up short in (2) channel also. I have not listened to the specific Parasound Pre-Pro so I cannot comment on its performance.
I was in the market for a similar processor and decided on the EAD TheaterMaster 8000. Pared up with my Theta Dreadnought it excels in both (2) channel and HT. You may want to look into the Ovation if you wish to take it up to the next level. The three you mentioned are not known for great (2) by any stretch of the imagination.
EAD was my second choice as the Theta Casablanca II was just a little out of my reach at this time, having spent several thousand dollars on my HT this year already. It was hardly a compromise.
Good Luck,
Michael
I was in the market for a similar processor and decided on the EAD TheaterMaster 8000. Pared up with my Theta Dreadnought it excels in both (2) channel and HT. You may want to look into the Ovation if you wish to take it up to the next level. The three you mentioned are not known for great (2) by any stretch of the imagination.
EAD was my second choice as the Theta Casablanca II was just a little out of my reach at this time, having spent several thousand dollars on my HT this year already. It was hardly a compromise.
Good Luck,
Michael