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Audio and Video Talk
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Speaker cable and Amplifier design
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<blockquote data-quote="GECO" data-source="post: 951147" data-attributes="member: 415"><p>I recently ran into a problem I never experienced before. this has to do with the new amp that I am developing.</p><p>i am trying to test the amp on as many speakers and one of the setups though me a curveball. the wiring was a modified Kimber 12vs. HFX called the new one Kimber 12vsx. it is a weaved cable around a carbon core that looks a bit like a pool noodle. </p><p></p><p>the amp did not like this setup and it must have had an oscillation very high up in the freq range. the heatsink temps shot up to 61deg. </p><p>this had me a little concerned and I went back to the design of the amp that worked very well and stable on all other conditions. I tried to simulate the effect of a high capacitance cable and a heavy load of the speaker and there is was on the trace. at this point, you might have asked. and before you ask, yes there is a Zobel network.</p><p></p><p>so with a little bit of fiddling around with the input shunt cap (100pf) and a miller cap (330pf), I got the situation sorted. I tested it again on the specific setup and it was 100% stable and not once did it go over 39deg.</p><p></p><p>on further investigation, there are a few amps on the market that do not like high capacitance weaved cables.</p><p></p><p><img src="https://i.postimg.cc/Nf075wb3/Whats-App-Image-2019-09-21-at-20-23-02.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="GECO, post: 951147, member: 415"] I recently ran into a problem I never experienced before. this has to do with the new amp that I am developing. i am trying to test the amp on as many speakers and one of the setups though me a curveball. the wiring was a modified Kimber 12vs. HFX called the new one Kimber 12vsx. it is a weaved cable around a carbon core that looks a bit like a pool noodle. the amp did not like this setup and it must have had an oscillation very high up in the freq range. the heatsink temps shot up to 61deg. this had me a little concerned and I went back to the design of the amp that worked very well and stable on all other conditions. I tried to simulate the effect of a high capacitance cable and a heavy load of the speaker and there is was on the trace. at this point, you might have asked. and before you ask, yes there is a Zobel network. so with a little bit of fiddling around with the input shunt cap (100pf) and a miller cap (330pf), I got the situation sorted. I tested it again on the specific setup and it was 100% stable and not once did it go over 39deg. on further investigation, there are a few amps on the market that do not like high capacitance weaved cables. [IMG]https://i.postimg.cc/Nf075wb3/Whats-App-Image-2019-09-21-at-20-23-02.jpg[/IMG] [/QUOTE]
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Audio and Video Talk
General Discussion
Speaker cable and Amplifier design
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