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Originally Posted by Carl /img/forum/go_quote.gif
Interesting. The ESC-1001 isn't mains driven either, it uses batteries. You think the bias voltage is really sensitive to ripple or something?
If this turns out to be the case, I think I'm going to change my amp design to support a battery supply for the bias.
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Woah, guys! Don't go changing all your designs based on a 1 hour A - B comparison that I carried out yesterday!
I'm not categorical that the SRD-6 IS quieter, or sounds better. I raised the issue because I fully expected the SRD-7 to be better, and it was not clear cut. I really need to carry out a blind test, to get rid of the expectations that the SRD-7 'should' be better.
My problem here is that my lovely assistant (aka SWMBO, who would normally be pressed into service for swapping plugs from A to B for blind testing) will KILL me if she discovers that I've got another set of SRX MkIIIs. As it is, one pair of SRX MkIIIs looks much like another, and the transformer is pretty much hidden away out of sight so she (hopefully!) won't notice that there's an SRD-7 box where there used to be an SRD-6! What I cannot do, in the circumstances, is have her see the 2 boxes at once (which would obviously be necessary for blind testing)! (I hadn't seen this as a long term problem, in that it was my intention to sell the original SRX MkIIIs with SRD-6 (SB) transformer: now I'm not so sure I want to get rid of a bit of kit that may be better than its replacement!)
Anyway, apart from the mains bias issue, another factor could be that the SRD-7 didn't sound as good as it could, because it hadn't been used for a while (I'm a firm believer in things warming up/being left on). On the other hand, the SRD-6 only ever gets 'warmed up' when it's in use, it being completely passive.
In any case, I look forward to my Kiwi chums coming up with their point of view when they've made this comparison, too.
(Meanwhile, I have to agree with the 17 year-old kid in the US who's supposed to be swotting for his O-levels [Azure?]: this site is very addictive! I'm even checking it out BEFORE I get round to lookng at pictures of women without any clothes on... )