blowing my subs

Regardless of what type of subwoofer you get, with them setup improperly, you will have problems with any brand....

Listen to DYohn. He knows more than you could possibly fathom.

well i mean under 600 a piece.....im not about to doubt what anyone knows on this site thats why im here asking for help....

The position of the gain control means nothing.  How did you check the "input to each amp" to know it is "fine"?  Did you set the amp gain using tones or music?  Did you use a meter or set it by ear?  Did you record the position of the volume control on your head unit when you set the gain and have you ever turned it up past that?

Here's what I'd do: take the car to a good local car audio shop.  Pay them for a couple hours labor to test your amps and make sure they are working OK, and to meter the outputs and reset your gain if the amps are OK.  It is possible the amps are clipping due to them being bad or that they outputs are simply failing due to age and use.  It is also possible your subs are defective (were they purchased from an authorized dealer?  If so, go there and to have the amps and speakers checked.)  I think you did what you could do, but it may not be sufficient in this case.  Get some hands-on help, it''l be worth the money unless you like to keep blowing speakers.  Then, if the amps are toasted, you are right there at the shop and can look at new ones! 

well thanks again for the advice guys i was also wondering where i can pick a meter so i can learn how to tune them so i don't have to go to a shop and thanks again

The best "meter" to use to set gains is an Osciloscope.  Here's one of the least expensive one's I've seen: http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=320-290

However there are ways of doing it with just a standard multimeter.  It won't be as accurate, but it will be much cheaper.