[1000mp] SP8 owners question can someone measure the inductors?

[James]

Always use headphones with thw 1000MP so I can not answer about insides 
of an unseen SP-8 speaker.  However, from using inductors for many years 
I can note that knowing the physical size of an inductor will inform one 
very little about its inductance nor about its self-resonance frequency. 
  As I recall, the Internet has described several passive audio filters.  
Once upon a time 88 mH inductors left from compensating telephone lines 
were central to the design of audio filters.  I have a passive such 
filter useful for CW.  FairRight (spelling?) presents a lot of 
information abut properties that may assist.  Of course, a 1000MP has a 
lot of filtering capability as it stands.
Good luck and let us know what you eventually craft.  73  Mac   N8TT


------ Original Message ------
>From "J Bowen" <sydbowen at gmail.com>
To 1000mp at mailman.qth.net
Date 3/15/2023 9:30:48 AM
Subject [1000mp] SP8 owners question can someone measure the inductors?

>Hey, I'm trying to figure something out. Does anyone own a SP-8 speaker
>that can measure the dimensions of the inductors on the filter board? I'm
>trying to make an audio filter and was wondering whether they are the
>Allied Component RDC20 or RDC30. Thanks!
>
>Jason Bowen, KB5VXX
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