I have an Oppo - 83 that sounds great with dvd's/Cd's into my 2channel NAD 352 integrated amp with an Audio Alchemy DAC. My speakers are Totem Rainmakers with REL sub-base. My problem is when playing a Blu Ray movie I get a lot of noise unless I set the Oppo to LPCM out put instead of Bittream out put. I am using an optical connect to the Audio Alchemy then digital into the integrated amp. If need be I can buy a preamp to handle the signal and bypass the preamp on the integrated. Please advise.