Am I gong crazy, or tie straps = lean?

mattjk · 25th July 2008, 03:37 AM

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:

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?

25th July 2008, 03:37 AM	#1
mattjk diyAudio Member Join Date: Aug 2004 Location: Huntington Beach, Ca	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:

25th July 2008, 09:18 AM	#3
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Have you moved things in your listening room? __________________ I use to feel like the small child in The Emperor's New Clothes tale

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25th July 2008, 08:33 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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.