I have a 98 blazer with aftermarket electrical system. I currently have 2 SA-15s running off of a hifonics hifi1500d. I'm wondering if i would notice any difference in sound if I added another sa-15 and ran a hifonics hifi 1000d on it? I want my system to be louder but not stupid loud haha any input on upgrading amps or anything like that will be accepted!