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In Reply to: RE: Here's what I Ended Up Doing (pics) posted by Maxamillion on November 25, 2015 at 20:27:51
After two days of listening, this is what I hear:Punchier, deeper bass with the BGT. Perhaps a little more bass detail. This is the most obvious difference.
Slightly cleaner overall presentation, but a subtle effect, not nearly as obvious as the above.
Didn't hear much difference with the resistor in or out of circuit. At times I thought there was a slight "thinning" of the sound with the resistor, but it may have been imagined.
So I'd say it's well worth the minimal effort.
I tried adding another BGT (my original junk box prototype) to the system but heard no
additional effect. It seems one BGT is enough in my system.I also tried moving the BGTs around to different locations such as source, preamp, amps, speakers. Again, the sound was the same at all locations, which makes sense to me as the grounds are all connected to form one continuous ground from source to speakers.
Anyway, that's my BGT build and evaluation. YMMV, as they say.
Edits: 11/27/15Follow Ups:
After a few days of listening thanks to the long holiday weekend, I noticed a brightness on some songs that had not been present previously. I thought perhaps the PP bypass cap might be to blame, so I removed it, and the brightness went away with it. I still have the punchier bass and dynamics but without the brightness.I think the bypass may have been creating a resonant tank circuit that artificially magnified the treble; modern electrolytics like the Panasonic T-HA series have very low ESR on their own and really don't need bypasses in power supply applications, in my experience. The ESR of a 47,000uF T-HA is .02 ohm at 120Hz and .018 ohm at 20kHz, quite good figures across the audible frequency range.
Anyhow, thought I'd relate my finding. I'm quite happy with just the 47,000uF electrolytic and a 9V battery.
Edits: 11/30/15
that description sounds what most people think a Solen cap sounds like!
I've had very good results with them as filter caps instead of electrolytics. As a tweeter cap they are harsh, though. The Tempoelectric cap review finds the same, good in PS but not so good in x-overs.In any case, I have plenty of treble energy as is, I don't need to boost it at all.
Edits: 11/29/15
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