How do you wire a speaker volume control?

This is strictly dependent of the type of control being used. If you just have a potentiometer (variable rotary resistor) then connect ONE wire from the source to the middle (wiper) terminal on the Pot. then from either other terminal on the Pot. continue the circuit to the speaker.

This just limits the amount of signal going to one speaker. THIS IS ONLY APPLICABLE WHEN ONE SPEAKER IS USED. If you could direct me to the instructions that came with your controller, I could help you out.

See my Bio.

If you purchased this from a Radio Shack, or similar electronics supplier, tell me the part, model number and I look it up for you.

ABOVE ANSWER IS TOO SIMPLISTIC....

Speaker volume control, done properly, is not a matter of just adding resistance (or variable resistance) to the line. Properly done, the amplifier's output impedence must be matched to maintain proper loading and avoid premature burnout and distortion.

Dynamic speaker connections (2, 4, 8 ohm, for example) can have a volume control added by using a potentionmeter (variable resistor) with decent results and without doing damage or getting too much distortion. For most applications this is okay.

What you need for a simple resistance control:

A 2-gang potentiometer of about 15 to 25 ohms rating. Here's more than you'll ever need to know: http://beavishifi.com/articles/Volume_Control/index.htm

THE RIGHT WAY:

The right way to do this is to use an 'impedence matching' control. These controls allow you to put on strings of speakers yet maintain a constant impedence to the amplifier output (up to the power limit of the amp, of course).

Here, now, is what you need: http://www.audioc.com/accessories1/misc/vcontrol.htm

ANOTHER WAY:

There is another way to do all this.. that is if you have pro-grade amps. You can use what is called 70volt lines. 70volt amp outputs allow you to string many speakers down the line (each with its own step down transformer, not hard to wire or figure out). If this is of interest then you may want to google it and go from there.

HOPE THIS HELPS.. Caio!