My apologies if this is posted elsewhere (though I can't seem to find it). I just received my new dbx160A and have been experimenting with hooking it to my TFB550. Both dbx160A and TFB550 are very quiet; the TFB has a Pre-EQ Send/Receive circuit and a Post-EQ Send/Receive circuit. I've currently got the dbx hooked to the Pre-EQ circuit, because the Post-EQ makes things noisy (it apparently amplifies the ambient 'whoosh' in the TFB's EQ circuits). Many compressors seem to be designed to switch between Pre and Post-EQ position in the signal path. What is the difference, and which is preferred (... for which situations ... and why)???