I copied this over from where I originally posted it on another forum with a few edits.
I really like the JVC RX-F10 with my 340s in a two channel rig.
Quick run down;
Using the direct mode with analog input is the best sound out of the JVC. This bypasses all the JVC's sound processing.
Best tweak I've done is a power conditioner. I picked up a OneAC off ebay for $15 including shipping. Apparently, digitals are more sensitive to bad power(although I haven't tried it on my Marantz to see what it does there.). I figured at $15 it was like gambling on buying a CD.
I've never listened to surround on the JVC.
The digital input while clean as can be with zero background noise I found to be sterile to my ears.
I do like the JVC better for music than my Marantz 7200 that is in my HT. The Marantz is a tad warmer and can play a bit louder. But I feel that in addition to playing cleaner, attack and decay and separation is better on the JVC in addition to eliminating background noise.
The JVC is known for it's amp. The Pannys are known for their processing in digital. Most people raving about the JVC are using it for 2 channel and for amplification with the processing is done by their CD players or stand alone DACs.
Best forum I've found on JVC digitals is here.