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In Reply to: That information is available posted by Metralla on December 20, 2004 at 18:05:32:
Here's my understanding of why Allen thinks the 9000ES is a better mod platform than the 999ES:The earlier generation Sony SACD machines use a non-conventional, DSD only "current pulse" DAC. CD playback is provided by converting PCM to DSD in a digital filter. Allen's mod to these machines taps the output of the digital filter (VC24 chip) and passes it through a circuit of his design that does low pass filtering and buffering for output. It bypasses the DAC and all the output circuitry, including a ton of op-amps.
The later generation Sony machines use conventional multi-format Burr Brown DACs just like Denon, Pioneer, et. al. So his current mod will not work in these machines. The BB DACs handle PCM and DSD inputs, so there is no conversion from PCM to DSD prior to the DAC. That means the DACs can't be bypassed without losing PCM playback capability, so all existing mods to these machines preserve the BB DACs and therefore don't offer as pure a signal path.
Dave
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Follow Ups
- Some information - Dave Kingsland 06:50:42 12/22/04 (4)
- Dave has it correct. And in addition... - Allen Wright 16:01:51 12/23/04 (0)
- I figured he was avoiding a confrontation with Jerome (nt) - Dave Kingsland 12:16:29 12/22/04 (1)
- Sorry, AA keeps attaching my posts to the wrong messages - Dave Kingsland 12:19:41 12/22/04 (0)
- Interesting. Wonder if Allen will comment? (nt) - Eric LeRouge 10:40:37 12/22/04 (0)
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