What do you mean by "analogue 5.1 processor?" There are a number of good to excellent analog 5.1 preamplifiers but, if there is any processing/conversion included, one could not call such a device an "analogue 5.1 processor."
I have reviewed many of these analogue 5.1 preamps in my column at www.stereophile.com/musicintheround .
Kal
I have reviewed many of these analogue 5.1 preamps in my column at www.stereophile.com/musicintheround .
Kal