I have a pair of speakers like these:
http://www.amazon.com/gp/product/B001RNOHDU/ref=ox_sc_sfl_title_2?ie=UTF8&psc=1&smid=ATVPDKIKX0DER
On which the power/volume control on the right side of the primary speaker no longer works...that is that it no longer works for volume, but still works...