Radio Shack has 8 ohm 20 watt resistors for $1.99 each that should work fine as long as you don't crank it up too loud. Just disconnect the speakers and put one between the binding posts where the speaker cables were. I don't know how much power your amp puts out but you don't want to run it wide open anyway.
You have to feed it a signal to get maximum benefit, so a CD player on repeat or from your tuner if you have one. Turn it up to where a moderate volume level would be through the speakers and this should be less than 20 watts. Feel the resistors after a few minutes and unless they are too hot to touch for more than a few seconds you should be fine.
You have to feed it a signal to get maximum benefit, so a CD player on repeat or from your tuner if you have one. Turn it up to where a moderate volume level would be through the speakers and this should be less than 20 watts. Feel the resistors after a few minutes and unless they are too hot to touch for more than a few seconds you should be fine.