Re: OPT equalising circuit

On Sat, 03 May 2008 13:07:51 -0500, John Byrns <byrnsj@[EMAIL PROTECTED]
>
wrote:

>In article <qb8p14pqru75poj4bdpjh8baj93dradhk4@[EMAIL PROTECTED]
>,
> flipper <flipper@[EMAIL PROTECTED]
> wrote:
>
>> On Sat, 03 May 2008 09:56:16 -0500, John Byrns <byrnsj@[EMAIL PROTECTED]
>
>> wrote:
>> 
>> >In article <3snn149ao18e473fqi2c39il0fbchjeedu@[EMAIL PROTECTED]
>,
>> > flipper <flipper@[EMAIL PROTECTED]
> wrote:
>> >
>> >> On Sat, 3 May 2008 10:08:10 +1000, "Phil Allison"
>> >> <philallison@[EMAIL PROTECTED]
> wrote:
>> >> 
>> >> >** Only a psychotic lunatic would deliberately connect a capacitor
across 
>> >> >the output of a tube audio amp.
>> >> 
>> >> Try measuring the capacitance of a loudspeaker.
>> >
>> >What frequency should I measure at, or do you want a complete sweep?
>> 
>> Doesn't really matter. The purpose was just to inform Phil there's
>> capacitance there.
>
>I would think it matters a lot, I thought whether there is capacitance 
>or inductance there depends on the frequency?  There are a lot of 
>resonance effects involved in the operation of loudspeakers.

This sounds like something that should be cataloged on the web.  Frequency
sweeps of raw drivers, complete systems with and without passive
crossovers, etc.  It would be nice to be able to get the characteristic of
a given system.

>
>
>Regards,
>
>John Byrns