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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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In Reply to: Re: Killing amps - I need your help posted by Awe-d-o-file on December 15, 2006 at 19:19:48:
There is some good advice here, most important is to measure the resistance your amp is seeing. This is not a perfect test in an RLC circuit, but if the resistance is low, that is most likely your problem. While not trying to make your problem overly complex, you may also want to consider using a zobel, and if your resistance readings are near 8 ohms, a zobel may be what you are lacking.Nelson Pass;
"After a period of confusion, Matt Polk and I realized independently that the lack of a characteristic termination was causing the problem. Polk developed and patented a "damper" consisting of a .047uF capacitor and 6 ohm resistor in series placed across the loudspeaker, while I used the same network but with .1uF and 5 ohms."
Nelson's amps were being toasted, and Polk's speaker cables were toasting many amps. A Zobel of either value should resolve this problem. I use them no matter what, though I tend to use very capacitive cables like Polk's short lived but highly respected speaker cables. For more such info.;
www.passlabs.com/downloads/articles/spkrcabl.pdf
http://www.trueaudio.com/st_zobel.htm
If you were to use an oscope and see oscillation as someone suggested, these zobels are the cure, I don't bother getting my scope out, I zobel everything.
Best Regards,Lou
Edits: 07/22/07 07/22/07
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Follow Ups
- Zoble time? - Lou S 13:38:59 07/22/07 (0)
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