Ofcourse it could. If the wire is 10 gauge or possibly even 8 gauge, your amp could be producing even less power than you think, even further underpowering the subs. You really need to get decent power to the subs to get them to perform to their full potential. Tuning your system (deck and amp) will do wonders as well. Every variable counts...from wiring, to box, to tuning...and it all adds up.