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RE: Not doing much until above 40kHz

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:


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.

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