Re: Impedance Matching Volume Control

[isw <isw@xxxxxxxxxxx>]

In article <IW_mh.111218$Rg5.972812@xxxxxxxxxxxxxxxxxxx>,
 "C" <thespade13YOUneed2removethis@xxxxxxxx> wrote:

> Hello!  I have searched the archive but can't find what I am looking for.
> Similar question but mine has a little extra that I can't figure out.
>
> I want to distribute the sound to some speakers at various location in the
> house and have control of the volume locally.  Using Impedance Matching
> Volume Control (IMVC) seems to be the solution.  However, If I want to add
> an A/B switch in one location so that I can use the speakers in that
> location for the central source or the local source, it changes the
> impedance of the central circuits.
>
> I've been told I need to use a speaker selector box (and leave them all ON
> if I want) but I am not sure I understand.
>
> Please see my installation here:
> http://img518.imageshack.us/img518/4228/imvclc1.jpg
>
> It shows want I want to do.  There are some questions too.  All the help is
> welcome.

Look into 70 volt (70.7 V, to be precise) audio distribution systems.

Isaac