[Boatanchors] Disc caps vs paper caps

[J. Forster]

Unsurprising.

I did a similar exercise between much-touted Bose gear and a competitor.
Nobody could discern a significant difference. The decision was ultimately
made on political grounds.

As to your speaker wire test, you were comparing apples and oranges. Had
you compared your super wire to ordinary flex of the same cross sectional
area, there would have been no difference.

YMMV,

-John

===============



>
> ----- Original Message -----
> From: "J. Forster" <jfor at quikus.com>
> To: "Glen Zook" <gzook at yahoo.com>
> Cc: "Boatanchors at mailman.qth.net"
> <boatanchors at mailman.qth.net>; "Mark Foltarz"
> <foltarz at rocketmail.com>
> Sent: Thursday, September 27, 2012 9:29 AM
> Subject: Re: [Boatanchors] Disc caps vs paper caps
>
>
> I bet I could easily construct a fair test where nobody
> could tell the
> difference.
>
> -John
>
>     Someone did this (audio coupling caps) and found no
> detectable difference.  I may have bookmark the site and
> will look.  He also measured distortion etc and could find
> none.
>     One point often missed is that coupling caps always have
> a large amount of DC on them which would swamp out any
> variation due to voltage coefficient of capacitance.  In any
> case that is measurable.  Storage factor (dielectric
> absorption) is of importance in timing circuits but not in
> general audio circuits.  Paper caps have low storage factor
> but certain modern film dielectrics are just as good or
> better.
>     When I could hear and was selling professional audio
> equipment I discovered that a lot of what I was told were
> subtle differences were not subtle and were plain old
> measurable distortion.  I also tested some "magic" speaker
> wire made by Kimber Kable.  On about a twenty foot run it
> _did_ make an audible difference compared to No18 lampwire.
> I measured the series resistance and found it was about a
> fifth of the lampwire, THAT was what made the difference.
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com
>
>