I saw some MTX, (5.25), speakers just recently. They cost $119.00 for a pair. They were single, (not dual voice coils).In other words, they were bass/low range only speakers. They seem to be high quality units. I'm going to take my Reatta rear speaker enclosures to the vender and size the whole deal up soon, (as of 14-Oct-2008). I am looking for the foam/rubber clearance when the coil retracts and contracts. There could be a possibility that the foam/rubber will chaff the plastic speaker enclosers as it moves in and out. I will report my findings and the part/model number of the speakers soon. Also if I purchase and install the speakers, I will let you all know about their performance/sound.later