Ungod

I have a pair of 2v400's. the fiest pair I had I had to use a Y adapter for quite some time, but the right fron and rear left input kacks like burnt out or something. The speakers worked fine and the wies where fine so it had to be the sub. I got them replaced, and got the cp-1 upgrade. I had also got a new computer by that time with the proper 4 channel sound card. I'm probably moving soon and was thinking about loaning my speakers out to some girls, but they would have to use a Y adapater to use all 4. Has anyone else used a Y adapter without damaging their speakers, or was it just something Klipsch put in the manual that wasn't a good idea afterall? Experiance adivce needed.