Which speaker wire does this hook up to?

$10.00 Electrical multi meter with continuity test mode.
 You short 2 conductors together,measure at the other end & if you have a continuous circuit(the same wire)from end to end you get a test BEEP...

That's a plus one. 

Regards

^^^That is a Tone Generator which requires a transmitter & receiver,YES works great BUT more $,more batteries,less usefulness compared to a Multi Meter...

Thanks all.  I will get a multimeter.

OP since you'll have a multi meter you'll need a tube amp to bias hahahaha....

I just had to do this... Solution!  9v battery.  Connect the contacts and you'll get a pop.. Shouldn't hurt the speaker but it was a lifesaver for me.

A cheap multimeter with the ability to test conductivity is all you need. Just put one end of the test lead to one side of the cable and touch the ones on the other side until you hear a beep.

dtximages, nailed it.  9v Battery and you have a speaker popper, been doing this since 1973 as a car audio diagnostic tool.  Part B using the same 9v battery you can use it for a polarity check.  Positive to positive and you get a speaker cone that move outward, if backwards, ie., positive to negative will make the speaker cone move inward.  Very cheap, simple, and effective.

Are the wires in pairs?  Then they should still have some sort of marking.

As for 'what/where', the 'pop' test is quick 'n easy...but a cheap meter is still a good call....

I've had a cheap meter for decades, and it comes in handy when you're trying to ascertain 'is this plug Hot?'

"Is my battery toast?"  Weak ones become obvious....*s*

Even some of the cheaper ones will indicate 'reverse polarity' with a negative sign before the reading....

Every audiophile ought to have one....by now....too handy to be ignored.

Wanna know resistance?  Measure it.

Only trouble with the multimeter is when the cable ends are 20' apart. Then you need either very long leads, or alligator clips and 20' of wire. And fire that electrician who did not label things ...