I cant for the life of me work out why some audio tracks or formats need an analogue input whereas others need a digital one.

 

I have my Oppo BDP-105D plugged into my Ground Sound DCN28 active x-over / DAC / pre amp via two sets of leads, a digital coax lead and a pair of analogue RCA cables.

 

Sometimes I will try play a song or a music video and I get a very loud crackling static noise, and I have to quickly change from analogue to digital, or digital to analogue in order to make it play properly.

 

I haven't gone as far as documenting when it does it, or which way it needs to be switched, but it seems to do it when listening to a disc source or a HDD source.

 

The only logical conclusion I can come to is that the active x-over doesn't support certain codecs, forcing me to switch to the Oppo for decoding.

 

The way I see it going down... If I am using the preferable digital connection (to avoid DAC conversion in the Oppo, only to convert back to digital in the DCN28 for processing) but if the DCN28 doesn't recognise the format i.e. an MKV file it plays static forcing me to switch the input to analogue where the decoding is done in the Oppo.

 

Does that make sense to anyone?

What's the output of the Oppo - when sending a digital signal ?  If you're using any form of Bitstream then that's exactly your problem - as the active setup can probably only handle PCM, forcing you to switch to analogue output and use the Oppo to decode.

 

Try changing the digital output from the Oppo to downmix everything to PCM and you should be fine.

The DCN cannot decode DD /DTS ... I think there is a setting on Oppo to send PCM/LPCM or something similar rather than the encoded signal.

Coaxial/Optical Output was indeed set to Bitstream. I have now changed it to 192k LPCM (has options of 48k LPCM, 96kLPCM and 192k LPCM).

 

That's it, thanks guys

 

Edit:

Good call Chris, just checked the audio track settings and it is a DTS 5.1 track.

Edited July 29, 201411 yr by Silent Screamer