Hi guys, I am not a poster here but saw a reference to some work I did in the diy room.
SBT just a menuing system for the SB server?
No it is very much removed from that and is an intrinsic part of your replay system, even if using digital outputs.
The SPT has internal regulators and theory suggests that any PSRR gained over the wall wart SMPS will stack up with the internal regulators to one glorious total, in practice it is not so easy but with care can tend to that direction.
I approached my supply upgrade in an attempt to remove some very high frequency noise (up in the MHz) that was on the spdif carrier.
Like all emc once out of the bag it gets every were and is difficult to put a lid on it. I was suspicious the noise was the wall wart switching noise and decided to eradicate it at source by substituting a linear supply.
My measurements showed that the SBT has a curious current pulse that it rhythmically takes from its supply, too fast for a multimeter but easy see see on a scope, this implied to me that a rather dynamic regulator is required.
Yes SBT power supply upgrade made a very noticeable improvement to my system, but mine is hardly a commercial system.
The supply was carefully designed to the SBT parameters and is perhaps nothing like the commercially available supplies.
I never used the SBT analog out for long which I found very poor compared to the converters we play with in the DIY room opting for optical in the early days, which moved to wired spdif and a brief experimentation with i2s, the i2s is superior of course but a total pita with the SBT.
The next imminent move is to asynchronous USB from the SBT with an XMOS based i2s interface to the DAC and EDO running in the SBT, reports among the diy bodgers are that this is a significant upgrade and is certainly an improvement on the vaguenesses that the spdif interface has, and I will be pleased to be rid of it. But again probably not applicable to commercial systems.
Do not make the mistakes of confusing spdif with tcp/ip protocols and the like with error detection / correction, spdif is like chucking data up a blind alley whilst under the influence of more than a few beers.
My humble opinion is supply upgrade success depends on both quality and suitability of the regulators used and the resolution of the remainder of the system for my system it was a winner, if I plug the SBT analog into a budget 5 series second system the power supply has little if any effect, certainly more gain to be had by rolling a few penny capacitors in the Naim gear.
Off to get my coat
Tony