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RE: update on the Al Sekela tweak

I find it strange that the Al Sekela tweak is only applied to the ribbon tweeter. It is no secreet that there is the possiblity of having HF/RF injected not only through the cables but also from the interaction speaker and cables. Power lines inside the amplifier may also pickup disturbancies. A Magneplanar driver looks very much a TV-antenna we use in Europe! The bass driver is very large, the push pull drivers may be better protected against RF. The power amplifier can see a brute impedance at very high frequencies.

The red curve in picture is what a power amplifier can "see" at its loudspeaker terminals with a conventional speaker. The blue curve is for a cable having a RC network at the speaker end (or inside the speaker).

http://forumbilder.se/EAC2G/karimp.gif


An RC network across the speaker terminals can help a lot for some combinations of power amplifier+speaker cable+speaker.

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