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<blockquote data-quote="KevL" data-source="post: 296373" data-attributes="member: 11798"><p>Have almost achieved success with Transit USB for SPDIF output to external amp.</p><p></p><p>Yesterday I managed to get it to work with bit-perfect audio for both 44.1 and 48kHz sources. As such I was able to pass DTS audio (44.1k) and DD5.1 (48k)</p><p></p><p>It is very hard to do but I finally worked out where I was going wrong. </p><p></p><p>For passing Dolby digital 5.1 and DTS from pc to DAC (in external preamp) the volume control in the PC must be set to 100%. Otherwise windows munges the data (when changing the volume) and the external preamp then cant understand the incoming data - so it either goes silent or plays it as a stereo signal. When data is simple PCM then windows can attenuate it as it just divides down the samples and passes them on. If it pull this same stunt with any compressed data (DTS, AC3 etc) then it actually corrupts the data.</p><p></p><p>So with volume set to full I was finally able to get it to work. No need to switch inputs on preamp and use 2 soundcards as the Transit USB just does the decent thing and passes all SPDIF stuff out untouched. I also disabled windows sounds, MP sounds for menus and muted all inputs etc. So my PC is now just an SPDIF transmitting device. I ended up using SPDIFER rather than AC3Filter as most of the functionality in AC3 filter is redundant in my app. I dont want to mess with the SPDIF stream I want it to pass straight through. SPDIFER is a subset of AC3filter and can be downloaded from the AC3 filter site.</p><p></p><p>Needless to say, sound quality is massively improved now that the preamp is getting proper un-messed- with SPDIF data. </p><p></p><p>I can now play music and watch DivX recordings. Have't yet got MPeg playback bit perfect (yet) but I'm nearly there.</p><p></p><p></p><p></p><p></p><p>Are you sure??? I think windows can easily mess up the sound coming out of an SPDIF port. It might be that it takes your 44.1K CD data, resamples to 48K, messes with the data (to attenutuate, apply DSP etc) then re samples back to 44.1 and sends it to your poor denon set. It then faithfully plays the resulting "data" -which strangely doesn't sound very good.</p><p></p><p>I bet if you could get a bit perfect output to your denon it would sound better than the PC MB. </p><p></p><p>It really is worth persevering with.</p><p></p><p></p><p></p><p></p><p>Kev</p></blockquote><p></p>
[QUOTE="KevL, post: 296373, member: 11798"] Have almost achieved success with Transit USB for SPDIF output to external amp. Yesterday I managed to get it to work with bit-perfect audio for both 44.1 and 48kHz sources. As such I was able to pass DTS audio (44.1k) and DD5.1 (48k) It is very hard to do but I finally worked out where I was going wrong. For passing Dolby digital 5.1 and DTS from pc to DAC (in external preamp) the volume control in the PC must be set to 100%. Otherwise windows munges the data (when changing the volume) and the external preamp then cant understand the incoming data - so it either goes silent or plays it as a stereo signal. When data is simple PCM then windows can attenuate it as it just divides down the samples and passes them on. If it pull this same stunt with any compressed data (DTS, AC3 etc) then it actually corrupts the data. So with volume set to full I was finally able to get it to work. No need to switch inputs on preamp and use 2 soundcards as the Transit USB just does the decent thing and passes all SPDIF stuff out untouched. I also disabled windows sounds, MP sounds for menus and muted all inputs etc. So my PC is now just an SPDIF transmitting device. I ended up using SPDIFER rather than AC3Filter as most of the functionality in AC3 filter is redundant in my app. I dont want to mess with the SPDIF stream I want it to pass straight through. SPDIFER is a subset of AC3filter and can be downloaded from the AC3 filter site. Needless to say, sound quality is massively improved now that the preamp is getting proper un-messed- with SPDIF data. I can now play music and watch DivX recordings. Have't yet got MPeg playback bit perfect (yet) but I'm nearly there. Are you sure??? I think windows can easily mess up the sound coming out of an SPDIF port. It might be that it takes your 44.1K CD data, resamples to 48K, messes with the data (to attenutuate, apply DSP etc) then re samples back to 44.1 and sends it to your poor denon set. It then faithfully plays the resulting "data" -which strangely doesn't sound very good. I bet if you could get a bit perfect output to your denon it would sound better than the PC MB. It really is worth persevering with. Kev [/QUOTE]
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