Hey, I have an Infiniti g35 coupe, with the stock bose system. I added a 12" elemental designs sub and hifonics brutus bx1500d amplifier to the system by using a hi/lo converter, however I am still hearing music coming from the subwoofer, which is obviously effecting the performance of the sub. I talked to my installer and he told me to get a crossover for my subwoofer...would this eliminate the problem and what are some good brands to look for? Also, I am not interested in changing my speakers or amp, as I don't plan to keep the car for too long, but is there anything I could do, such as adding an equalizer to the bose setup to make the system sound any better? It's pretty weak. Any help would be great. Thanks.