Tweakers' Asylum

Electronics specialists lab-quality filters

64.169.0.240

boodles

I'm wondering if anyone has tried one of the Electronics Specialists Laboratory-Grade 20 amp surge suppressors/line filter units for audio use (unit #AC-SFM-32M).
http://www.elect-spec.com/acprot2.htm#Laboratory
The company claims they are fantastic for high-end sound systems and the price seems quite reasonable.
Thanks!
Chris

Follow Ups:

Series inductance is not advised for power amp supplies. - Al Sekela 15:52:07 03/10/09 (1)
The data sheet looks amateurish and the spec of 65 dB isolation is not likely to be met over the full 10 KHz to 250 MHz noise frequency range. Compare to the Corcom Q series spec sheet at the linked site.

Such filters work by using series inductors and shunt capacitors. Even though the inductance is small, it will still inhibit current to some power amps and affect their dynamics.

The capacitor dielectric materials also have an effect on the sound. I don't know what kind ESP uses, but it is likely they are polyester or polypropylene. Neither of these sounds good compared to metallized paper, IMO. Thus, these filters may not be the best choice for use with source equipment either.

Surge suppression with MOV devices introduces additional grunge, and the devices wear out over time.

Keep in mind that the company may think a high-end sound system includes a 7-channel receiver with about 50 microprocessors and horrid little switching amps inside.
- Corcom Q series (Open in New Window)
- RE: Series inductance is not advised for power amp supplies. - boodles 18:41:53 03/11/09 (0)
  Hi Al
  Thanks so much for the helpful response. I have quite a few additional questions. Would it be possible to discuss them by e-mail?
  Thanks!
  Chris (cporada@cabnr.unr.edu)
RE: Electronics specialists lab-quality filters - boodles 21:38:06 03/09/09 (0)
Or even the 15 amp version :-)
Thanks!
Chris

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