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-   -   Am I gong crazy, or tie straps = lean? (http://www.diyaudio.com/forums/chip-amps/126919-am-i-gong-crazy-tie-straps-lean.html)

mattjk 25th July 2008 03:37 AM

Am I gong crazy, or tie straps = lean?
 
I finished my wiring, and I used about 20 tie straps to clean up the wiring. after wards, I fired the amp back up and it became thin and bright sounding. Am I imagining things???

a before picture:

http://www.pbase.com/mattjkphoto/ima...0/original.jpg

AndrewT 25th July 2008 08:33 AM

close coupling the wiring may have changed the HF impedance loading on the output leading to reduced phase margin.
Or it may be feeding back some signal to the input, again decreasing the phase margin.

If you decrease the phase margin you bring the amp closer to instability but you also increase the peaking on the faster signals giving this shrillness.

This is a similar problem to a badly laid out PCB.

Well spaced wiring is better than close. Wires crossing at right angles is better than running parallel.

Eva 25th July 2008 09:18 AM

Have you moved things in your listening room? ;)


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