something under driver seat

My 93 V6 LE has something under the drivers seat or at least feels like it. When I turn corners it shifts/ slides from side to side. I looked under the seat but could not see anything without removing from car. I has power seats. Im not concerned more curious as to what it may be.

Thanks

Probably the factory alarm system

I thought about it being an amplifier or something like that, The car does not have the factory security system. Anything else mounted under the driver seat it is power seat maybe something loose.