1. A customer called about
a subsonic filter. It seems he was seeing large movements of
his woofer while playing quiet passages of a record. When he
switched to mono the motion disappeared (showing that it was
a vertical warp problem). I would have suggested our passive
filter (a series capacitor) but he has a moving coil cartridge.
The passive filter is designed to work with the 47 kOhms input
resistance of a MM input. With a typical moving coil input of
a few hundred ohms the capacitor would be impossibly large.
So I suggest our active filter for $185
which connects between preamp and amp (and gives a much steeper
rolloff). He agreed and gave the card information. A couple
hours later he called back, agitated, Does this mean I
need an additional cable? I said yes, not a normally a
big deal, but in this age of $3000 cables
I offered to
wire the box with a captive cable instead of a jack. He said
hold the order. I never heard from him again.
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