SONY CDP 557ESD (707ESD) sound shaping

phixphi · 22nd October 2010, 02:10 PM

Hi all!

I have a CDP 557ESD. It sounds...well, in general horrible (I listen through Stax 717 + O2MkI). If there are more than 3 instruments the output is a complete bordello, a total mess, all female voices sound like vipers, etc,etc.
But, I feel the it has some potential, so I try modding it.
The first thing to go is Guido's clock with a dedicated PSU.
Then has anybody sucessfully tried:

1) Ignoring deglitching/lowpass/buffer crap and connecting a passive (R or trafo) I/V, followed by a decent (tube) output directly to the pin 35 of PCM64? Will try to cut the relevant part of the schematics and post it for completeness. PCM64 has +/- 1mA out.

2) Putting it into NON-OS but without completely bypassing CXD1144?

Any hints on the baove questions welcome

Can provide the datasheets on CXD1144 and PCM64 if needed.
Cheers,
jk

phixphi · 22nd October 2010, 03:09 PM

Just to answer my own question

it looks from the datasheets
like CXD1144 has no Non-OS mode unless I'm wrong.
So probably bypassing is the only way. But will CXD1305 and PCM64 be happy
with the data directly from CXD1125? Datasheets of CXD1305 anyone?
Cheers,
jk

rascal101 · 21st April 2011, 09:37 PM

The PCM64 is an 18bit parallel input DAC (probably using segmented architecture like the PCM53 ... maybe). This type of DACs are very rare. Compared to serial input DACs you have faster conversion time and higher monotonic performance. Maybe better THD+N too. I think it is better to make changes on the output coupling capacitor like the one proposed by Walt Jung in his picking capacitors paper.

22nd October 2010, 02:10 PM	#1
phixphi diyAudio Member Join Date: Apr 2010	SONY CDP 557ESD (707ESD) sound shaping Hi all! I have a CDP 557ESD. It sounds...well, in general horrible (I listen through Stax 717 + O2MkI). If there are more than 3 instruments the output is a complete bordello, a total mess, all female voices sound like vipers, etc,etc. But, I feel the it has some potential, so I try modding it. The first thing to go is Guido's clock with a dedicated PSU. Then has anybody sucessfully tried: 1) Ignoring deglitching/lowpass/buffer crap and connecting a passive (R or trafo) I/V, followed by a decent (tube) output directly to the pin 35 of PCM64? Will try to cut the relevant part of the schematics and post it for completeness. PCM64 has +/- 1mA out. 2) Putting it into NON-OS but without completely bypassing CXD1144? Any hints on the baove questions welcome Can provide the datasheets on CXD1144 and PCM64 if needed. Cheers, jk

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22nd October 2010, 03:09 PM	#2
phixphi diyAudio Member Join Date: Apr 2010	Just to answer my own question it looks from the datasheets like CXD1144 has no Non-OS mode unless I'm wrong. So probably bypassing is the only way. But will CXD1305 and PCM64 be happy with the data directly from CXD1125? Datasheets of CXD1305 anyone? Cheers, jk

21st April 2011, 09:37 PM	#3
rascal101 diyAudio Member Join Date: Jun 2005 Location: Metro Manila	The PCM64 is an 18bit parallel input DAC (probably using segmented architecture like the PCM53 ... maybe). This type of DACs are very rare. Compared to serial input DACs you have faster conversion time and higher monotonic performance. Maybe better THD+N too. I think it is better to make changes on the output coupling capacitor like the one proposed by Walt Jung in his picking capacitors paper.

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