Anzgar said:
I see the same on a dual trace scope whichever way connected. Maybe you swapped scope polarity when you switched the wires?
KoolKid731: " ... soongsc sounded like one-in-a-billion, ok, maybe 1-in-a-million.
"Highly subjective listen may be the reason for low volume in high-end gear besides the price. It's hard to get two audiophiles to agree on the quality of a system. ...."
"However audiophiles swap lower cost items (amp, op amp, cables etc...) and not speakers or room because they're lower cost. ..."
.......
True enough, as far as it goes. Many of us DIY types do simple upgrades that very often do show genuine, positive results. Example: I just finished doing a simple mod to a Behringer 2 channel microphone / line level pre-amp (Behringer Ultragain Pro MIC2200, US$90 to US$100). The problem was a small, but noticable amount of noise in the output in the form of "hum", etc. (This gadget gets bad reviews for this.)
Opening the gadget up I noticed that the power supply could use more filtration (more, better quality capacitance). I added additional electriolytic caps plus a plastic snubbing capacitor to the power supply circuit board and installed a "laboratory quality" power line filter to the power cord connector. Just looking at the 'scope demonstrated a respectable before / after improvements. True the original costs and the costs of the upgrade were nominal compared to "audiophile quality" gear, but the results are repeatable on my bench or anyone elses. Now I would match this modified pre-amp against any under US$1000 (except for the equalizer stages which still could use some work.)
As for speakers, there is considerable work being done right here to all manner of speaker types and mod technics as well as upgrades to crossovers, active and passive ... check it out: http://www.diyaudio.com/forums/forumdisplay.php?forumid=22
(if anyone is interested, I have pictures ...)
"Highly subjective listen may be the reason for low volume in high-end gear besides the price. It's hard to get two audiophiles to agree on the quality of a system. ...."
"However audiophiles swap lower cost items (amp, op amp, cables etc...) and not speakers or room because they're lower cost. ..."
.......
True enough, as far as it goes. Many of us DIY types do simple upgrades that very often do show genuine, positive results. Example: I just finished doing a simple mod to a Behringer 2 channel microphone / line level pre-amp (Behringer Ultragain Pro MIC2200, US$90 to US$100). The problem was a small, but noticable amount of noise in the output in the form of "hum", etc. (This gadget gets bad reviews for this.)
Opening the gadget up I noticed that the power supply could use more filtration (more, better quality capacitance). I added additional electriolytic caps plus a plastic snubbing capacitor to the power supply circuit board and installed a "laboratory quality" power line filter to the power cord connector. Just looking at the 'scope demonstrated a respectable before / after improvements. True the original costs and the costs of the upgrade were nominal compared to "audiophile quality" gear, but the results are repeatable on my bench or anyone elses. Now I would match this modified pre-amp against any under US$1000 (except for the equalizer stages which still could use some work.)
As for speakers, there is considerable work being done right here to all manner of speaker types and mod technics as well as upgrades to crossovers, active and passive ... check it out: http://www.diyaudio.com/forums/forumdisplay.php?forumid=22
(if anyone is interested, I have pictures ...)
soongsc said:
Certainly not, but I measured on old fashioned pwer supplies like the pic I attached. If you measure on one like this what I say is true.As you can see the mid point of the transformer is earthed but on the psu with 2 bridges the trafo is not earthed and in that case you obviously get no difference.
Attachments
Michael. I have done a couple of drawings. Please check the wiring on the Power Amp pi, but I think that it's o.k
Rob.
Rob.
Anzgar said:
I see.
But it was the NCD power that difference could be heard. So I was just curious.
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