I lost maybe 10db in volume, and I lost alot of FR. The Bottum driver did FR from 30hz to 18hz. THe bad driver's surround looks brand new actually. No rubbing in the voice coil, it is just wore out. Its about 80% THD, and 20% bass. It is a 12" driver. It is 83 dollars for a new driver. Well Tour, the amp on it is 15 years old. The components inside the M&K are 15 years old! lol! Infact, while I was messing around with the M&K, i found out that the left input was bad! lol!