I vote no DSP's other then PLII. I've never used a DSP mode on any pre amp or receiver I've owned. I would prefer that we could just leave it set to auto decode all incoming material for each channel. ie on all inputs other then CD I'd have it set to decode 2 channel into PLII and 5.1 material into either DTS or DD which ever is present. The CD input I woudl just leave on analog bypass.

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The Pratt Home Theater and Custom Pronto programming page