Marantz AV8801 Preamp/Processor Official Owner's thread - Page 405 - AVS Forum
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post #12121 of 12127 Old Yesterday, 12:43 PM
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After reading/Google searching several pages of this thread, I never did find a clear answer to this question: If Pure Direct mode is used, are the analog stereo inputs re-digitized AT ALL by the AV8801?
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post #12122 of 12127 Old Yesterday, 01:30 PM
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You didn't get an answer because those responding (including me) don't know. Someone would have to pour through a detailed schematic diagram, which would reveal that information. Unfortunately, they're very hard to come by.

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post #12123 of 12127 Old Yesterday, 01:36 PM
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Quote:
Originally Posted by Selden Ball View Post
You didn't get an answer because those responding (including me) don't know. Someone would have to pour through a detailed schematic diagram, which would reveal that information. Unfortunately, they're very hard to come by.
Thanks for the response. I thought as much as it had been discussed, perhaps someone had answered it and I just missed it.

I just had a chat with someone from Marantz technical support and asked the question, and they took a good 10+ minutes before saying that: no, nothing is digitized in Pure Direct mode. They said they "double checked," so I don't know if that means they asked someone, or if they just looked in the manual and mistook "no digital processing" for "no digitizing." I tried to make it clear I was asking about the latter (I think I said: "I know Pure Direct turns off digital processing, but does it bypass all digitizing in the AV8801?") and that's when it took them a while to come back with an answer, so maybe they actually did check.

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post #12124 of 12127 Old Yesterday, 01:48 PM
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There have been word-of-mouth claims for both situations. As a result, I'd really like to see a frame-grab from the schematic.

The main audio does have to be digitized in order for the option "LFE+MAINS" to work (that option copies low frequencies to the subwoofer), but that says nothing whatsoever about whether or not there's a pure analog path that runs in parallel to the main preamp outputs.

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post #12125 of 12127 Old Yesterday, 01:50 PM
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Quote:
Originally Posted by Selden Ball View Post
There have been word-of-mouth claims for both situations. As a result, I'd really like to see a frame-grab from the schematic.

The main audio does have to be digitized in order for the option "LFE+MAINS" to work (that option copies low frequencies to the subwoofer), but that says nothing whatsoever about whether or not there's a pure analog path that runs in parallel to the main preamp outputs.
That is possible but there can be a delays associated with the A/D conversion and DSP processing so it seems unlikely.

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post #12126 of 12127 Old Yesterday, 02:14 PM
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Originally Posted by Selden Ball View Post
There have been word-of-mouth claims for both situations. As a result, I'd really like to see a frame-grab from the schematic.
Yeah, my curiosity hasn't really been satisfied by the tech chat. I'd still like to have a full, technical explanation from someone at Marantz or anyone with a schematic and know-how.

Question: since we know the 7.1 inputs aren't digitized, would it be possible to just to run a pair of RCAs to the FL/FR 7.1 inputs and switch between them and, say, the RCA stereo inputs and compare? Surely if the latter aren't digitized in Pure Direct they should sound/measure identically, right?
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post #12127 of 12127 Old Yesterday, 02:20 PM
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Quote:
Originally Posted by SolRage View Post
Yeah, my curiosity hasn't really been satisfied by the tech chat. I'd still like to have a full, technical explanation from someone at Marantz or anyone with a schematic and know-how.

Question: since we know the 7.1 inputs aren't digitized, would it be possible to just to run a pair of RCAs to the FL/FR 7.1 inputs and switch between them and, say, the RCA stereo inputs and compare? Surely if the latter aren't digitized in Pure Direct they should sound/measure identically, right?
You can connect all inputs 7.1, XLR, COAX, and TosLink and use remote codes to switch between them.

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