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Clarifications.

Posted by Al Sekela (A) on December 4, 2007 at 13:39:39

In Reply to: RE: Thanks Guy's ! posted by benie on December 4, 2007 at 01:44:55:

Bart is incorrect: all the dedicated audio circuits for my system have carbon fiber cover plates. These four circuits are grouped in two dual-gang boxes, and each box has its own cover plate. These plates are made from thick slabs of carbon fiber laminate Bart found on the Internet. The test was done on the dedicated circuit for the Wadia 861, which is fed from the box with a cover plate fabricated to accept larger plugs.

I removed the other cover plate to install two additional filters (one for each power amp circuit), as the plate for that box had smaller holes. I let the filters burn in for a week, then compared the sound without the cover plate to that with the cover plate reinstalled (I had drilled out the holes to fit the filter plugs in the mean time). There was a small improvement with the cover plate reinstalled, so most of the improvement the two of us heard in the original test was likely due to the filter by itself.

The transformer I swapped out in the original test was the damping device for the Wadia circuit. It was a 1 KVA, 14-volt filament transformer with R-C loading on the secondary. It was my approach to the parallel-inductor (Hammond choke) tweak. Previous tests of unplugging this beast showed that it improved the system sound considerably compared to the case of no damping on the AC circuit. The TI-Shield R-C damper did not work as well as the transformer when the R-C damper was freshly made. However, after a week of burn-in, it worked better than the transformer, as reported by Bart. I removed the transformer permanently after our test. I now have three similar TI-Shield R-C dampers installed, one for each dedicated audio circuit in use. I plan to make more for use elsewhere in my house.

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