so i have an ext cab and am running a single jl10w3v3. however i have it in a big box and it takes up a seat due to me having to fold the seat up. i want to add another sub and install them under the seat. question is should i stick with the the jl and lift the back seat due to the fact they have an almost 6" mounting depth or go with the slim pioneers. ill be changing from one amp to two amps. i was thinking about the new jl xd400 to run the front and rear focal 6.5" components. im going to use the xd600 for the subs. have you guys seen how small these amps are. its awesome you could put them anywhere. will i notice a difference between these subs. good or bad.