From: "Benoit Provost"
Subject: Re: volume control at speaker location
Date: Thu, 26 Sep 2002 15:08:22 -0700
Organization: Intel Corporation
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Thanks for the input. I will try the simple option of adding a resistor at
the center tap.
"N. Thornton" wrote in message
> > I read in sci.electronics.design that Benoit Provost
> > about 'volume control at speaker location', on Tue, 24 Sep 2002:
> > > My sound system is in my living room, and I am installing speakers in
> > >basement, wired to "Speakers B" on the amplifier. I would like to know
> > >there is a simple (passive) way to adjust the volume at the speakers in
> > >basement. The simplest way to do this is of course to put a
> Use a variable resistor in series. It is the easiest way to do it. You
> won't get a linear scale as you say, but I don't see how that is a
> problem to be honest. It still works perfectly.
> If for some reason you crave more linearity, you have a few options:
> Adding a fixed R from centre tap to one end of the pot can help to
> some extent.
> If you use a big wirewound R, and want to get messy and linearise, you
> may be able to solder fixed Rs onto sections of its track to even out
> the volume changes.
> If you are obsessed with total linearity, and are willing to forsake
> variable controllability, go for switched series Rs.
> L pads, which keep amplifier load impedance constant, are only needed
> where the amp is:
> 1. driving other speakers as well, AND
> 2. either has a high impedance output OR is driving series connected
> speakers, OR series parallel units.
> In other words L pads serve no purpose in your situation, other than
> to waste power for no reason, and increase part count.
> For home use I would use a power pot, problem solved.
> Regards, NT