trouble

ok i just bought a new memphis amp it was $300 and i have a 15" memphis sub, it works all fine on friday and it just shut off late friday night, i thought a wire came off and when i checked the fuses were blown, i turn the amp all the way down and i can only turn it up a 1/4 way and it goes into protect and the sub stops working, i hooked the amp up to my friends car, and his sub works fine with the amp, then i tried my sub and my amp in his car and the sub still don't work right and the amp still goes into protect when i try turning it up, the place where i bought it was trying to tell me it was my wiring, and they want me to  pay them $50 to check my wiring when i kno its the sub, don't you think its the sub too?

You are turning the amp gain like a volume knob!  What is the impedence of the sub?  Did you buy amp and sub new or used?  Expect to pay $50 if you want something checked out.  Also post models of the amp and sub.  And did you install?Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

At least you're dealing with a store you can go back to.  Post up the info tomorrow, then.  Will want to know sub impedence, wiring used, enclosure size, ....but why can't you just walk back in there with the sub uninstalled, set it on the counter and tell them it has a problem?  They can hook it up right there in the store.  No charge for that.Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

sounds like you have an improper ohm load going to the amp! 

the sub has blown....if the sub doesn't work on either amp then its most likely a blown voice coil. or it could be a low impedence on the amp check that the impedence at the amp is something the amp can handle.Quad L Handyman services