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BAS Message
March 2019

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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updated 3/9/19