home audio impedance

[atat]

I am installing 8 pairs of speakers in my home that is being built for in-home sound. I have it all wired with 14 guage speaker wire. I have a Russound 8 zone speaker selector, with impedance matching. All 8 ohm speakers. 8 ohm receiver..(I am not able to turn the impedance matching off on the selector.) Can or should I use an impedance matching volume controller?? Autoformer?? any hints of suggestion would be greatly appreciated!! thanks

 

[richie00boy]

If the switch simply chooses between one pair of speakers at a time, I can't see what impedance it matches. Does it allow you to select multiple pairs?

Volume for each speaker could simply be an L-pad on each speaker.

 

[atat]

The selector will allow me to play eight sets of speakers at the same time....

 

[richie00boy]

Just stick an L-pad on each speaker then.

Although my preference would be an individual amp for each one to maintain best quality.

 

[sreten]

Hi,

impedance matching / autotransformers should be used if
you don't want what bass is left (after the trannies in the
selector) to turn to mush and the frequency response to
end up all over the place which it will with L-pads.

something like this :

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=300-548

An externally hosted image should be here but it was not working when we last tested it.

🙂/sreten.

 

[atat]

Still confused..... I emailed phoenix gold and Russound to see what they would say.... Pheonix Gold Tech said:

If you can not turn off the impedance matching on the selector than it is advised to utilize a non-impedance matching volume control, such as our VRR60 or VRR120..

The Russound guy says it does not matter it ok to use impedance matching controllers with an impedance matching speaker selector.....

I have had one person at the local Audio shop say that if I used impedance controlling selector and impedance volume control, it will suck the power outta my receiver???? and i dont know what an L-pad is??? im looking it up....
thanks
Adam

 

[atat]

Thanks for your reply SRETEN!!!! In the link you sent me, I read the product description.... as below:

DAYTON RVC-W IMPEDANCE MATCHING VOLUME CONTROL WHITE

Part Number 300-548
Price: $28.44 EA
Special Price: $24.66 EA
Quantity:
Need a large quantity?
In Stock? Yes
Weight: 1.20 lbs.
Catalog Page: 052 (PDF)
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Protects up to 16 pairs of 8 ohm speakers
Decora-style design available in white or ivory

The Dayton Audio Volume Controls are the perfect addition to whole house audio distribution. Choose from a classic rotary style control or add a contemporary flair with a sliding adjustment design. Impedance matching will protect up to 16 pairs of 8 ohm speakers simply by setting a jumper to the number of speaker pairs in the system. These can also be used as non-impedance protected volume control when a switch box is used for protection. The removable PCB wiring connectors accept up to 14 gauge wire and makes installation fast and easy. These stereo controls feature 12 steps of attenuation, 3dB each with the final two steps at 6dB each. They come complete with wall plate, hardware and installation instructions.

Specifications: *Power Handling: 50 watts RMS per channel/100 watts max. *Frequency response: 35-20,000 Hz. *Mounting configuration: Standard single duplex electrical box *Dimensions: 4-1/8" H x 1-1/2" W x 3" D (depth in wall 2-5/8").


the part above that is confusing is where it says "can be used as non-impedance protected volume control when a switch box is used for protection....

Still use impedance volume control???

thanks
ADAM

 

[sreten]

Hi,

I assume the non-impedance protection mode means the following :

That at full volume setting the transformers are completely bypassed.

I assume the impedance protection mode means the following :

That at full volume setting the transformer is in circuit.

🙂/sreten.