In Reply to: How does your mod benefits the SCD-1 balanced out? posted by jeromelang on February 14, 2003 at 18:07:15:
Jerome,
The complex way SONY do the balanced outputs on the SCD-1 has been commented on here before.To recap:
1/ The digital signals in the SCD-1 (and all the VC24 based players) are in Balanced format
2/ SONY then convert the Balanced analog signal that appears after their "current pulse" DACs into Unbalanced format, using several opamps
3/ They then filter the signal in Unbalanced format, with more opamps
4/ This Unbalanced signal is then output on the RCA jacks of all these players.
5/ But then, in the SCD-1 only, this unbalanced signal is RECONVERTED to a Balanced format and output on the XLR sockets - using even more opamps!With my Upgrade, if you want a Balanced output we use a Balanced version of the module that taps off the Balanced digital signal and converts it directly to a Balanced analog signal - and outputs it to the existing XLRs (SCD-1) or to new XLRs (fitted as part of the upgrading proceedure) for the machines that normally only have unbalanced RCA outputs.
And instead of the signal being handled by NINE opamps to get to SONY's balanced outputs - we only use three discrete transistors per signal path, which I consider is doing more with much less!
Allen (VSEI)
PS We currently can add balanced outputs to these normally unbalanced machines:
SCD-777ES, 9000ES, SCD-555ES (european model), SCD-C333ES (US) and the European/Asian XB940
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Follow Ups
- Re: How does your mod benefits the SCD-1 balanced out? - Allen Wright 09:57:12 02/15/03 (0)