Volume Control True Off Position

On Jun 8, 2008, at 12:33 AM, xxxxx@msn.com wrote:

Name : David Yee

Message :
Can you tell me if the phoenix gold VSL125-RB volume control has a true OFF setting? If not is there one with a true OFF setting? I had heard that w/o this then there is a small amount of sound coming from the speakers even with the volume setting at the lowest?



Nope. None of the impedance matching versions out there will have a true off setting, where it totally disconnects from the circuit.

This is because the function of the impedance matching is that the whole circuit needs to remain constant. Meaning that the amp sees 8 ohms of impedance all the time. If one were to be taken out of the circuit, the impedance would change, going up in value, thereby all the other speakers would get more quiet. Which would be undesirable.

But I haven’t experienced that bleed thru with any of the volume controls at all. If you have your system properly initialized with most all of your volume controls set correctly, you shouldn’t hear anything when you turn one off.

Another option to avoid it completely would be to use a speaker selector as your impedance device and when you need to confidently turn off an area, use the button on the speaker selector. Speaker selectors take the leg completely out of the circuit. In this case, you’d use just regular volume controls with no impedance matching.



Impedance Matching Volume Controls vs. Speaker Selector Question

Everything I read indicates I need to connect my receiver to an impedance matching speaker selector, from there to each room’s volume control and speaker pair. If I have impedance matching volume controls in each room, why do I need a speaker selector? What does the speaker selector actually do? Can I run parallel to each room’s volume control directly from the receiver without a speaker selector? Thanks.

Typically, in a home situation we suggest a speaker selector with standard volume controls because you can turn off areas that you wouldn’t normally use and those areas truly get taken out of the circuit. Then the other areas get more power and better sound.

In an application that you would have all the areas on most all the time, you could (and should) use just impedance matching volume controls only. When you turn down an impedance matching volume control to it’s “off” position, it’s not truly off on the back side of the circuit. It has to remain in the circuit or else the circuit would always be changing the load to the amp, therefor causing volume fluctuations everywhere anytime someone even makes one click of an adjustment.

So you can do it both ways. The downside to using the speaker selector method is that it costs a few more bucks.


Whole House Audio Question


The Receiver you mention is really made for surround sound applications.
The “channels” it has are for the decoded section from movies to be
played back at the given positions of a home theater.

The more practical set up for you might be a set up with two basic
“stereo” type receivers with two speaker selectors.

Your other more basic option for whole house music is to have just one
receiver with an 8 pair selector.

By having two receivers you`ll have the ability to play two different
things at the same time in your two “zones” that are set up with your

No problem not having the volume controls, they are optional with the
use of a speaker selector.

> Name :
> Doug Reed
> Message :
> I recently built a house and wired in a total of (14) 100-amp, 8 ohm speakers (4 in each of 2 rooms, and 2 in each of 3 rooms). The speaker wire is 16 gauge, and the wire “runs” are all less than 100 feet. I now need to purchase a receiver to power these speakers, and am considering the RX-8040B Audio/Video Receiver by JVC. This unit offers 130 watts x 6 channels, and 8 ohms of overall impedance. The receiver offers “dual room” capability, so it would be my intent to drive the two 4-speaker rooms with four of the receiver channels, and the three 2-speaker rooms with the remaining two receiver channels.
> I know that I will need speaker selectors to enable me to select any or all of the speakers at once. What speaker selectors do you recommend (note that my speakers are relatively low-cost)?
> Will I need two selectors to handle the two 4-speaker rooms, to enable me to take advantage of the 4 receiver channels that I intend to feed to those rooms?
> Do you anticipate any problems in powering up to 14 speakers at once with this amp?
> I did not install volume controls on any of the speakers. Do you anticipate that I will need them?
> Thanks for your help on this.
> Doug

Speaker Selector and Volume Controls

Speaker selector and volume controls question from Robert Schimmel:

Message :
I have wired my house for speakers; two rooms with one pair, and one room with a single dual channel speaker. The wires exit the wall by my by my stereo at a two gang box. Each room has a box for a volume control. Can you suggest what I need to complete the installation (i have speakers). speaker selector? wall plate? volume controls?
thanks, roger schimmel


Sure, a basic speaker selector like this one:
InwallTech SS4R

InwallTech SS-4R Speaker Selector
InwallTech SS-4R Speaker Selector


Volume controls to match:
InwallTech VC2100R

Volume Control
VC2100R Volume Control