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In Reply to: RE: Not doing much until above 40kHz posted by neolith on February 08, 2012 at 15:13:40
In some cases the poweramp sees a very low impedance at high frequencies, the red line of this diagram, dropping to 0.25 Ohm at 10 MHz:
http://www.lts.a.se/pub/artiklar/hogtalarkabel/karimp.gif
In can be cured by a suitable loudspeaker cable, one with a caracteristic impedance that matches well. A RC link at the end of the cable (or inside the speaker) and the amplifer sees the impedance of the blue line. Many amplifiers have a similar RC link (Zobel network) at their outputs.
Roger Gustavsson
Follow Ups:
Yes, indeed. The choke should raise the impedance at high frequencies but because of self-capacitance the high frequency behavior is far from ideal and an RC network across the leads is the way to go. I believe that is what the Walker High Definition links are.
BTW, I couldn't get your link to work.
On the violin: "Heaven reward the man who first hit on the idea of sawing the innards of a cat with the tail of horse."
Edits: 02/09/12
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