I've got two Alpine 10" 4 ohm 250 watt subs powered by an Alpine 500 watt amp wired at 2 ohms in a sealed box. My speakers all sound equal but the sub on the driver side hits noticeably harder than the sub on the passenger side. I don't think it's my hearing or position or anything like that because the driver side tail light rattles and vibrates more than than the passenger side. It's in a 2000 Jeep Wrangler, everything is aftermarket (stereo, speakers, amp, subs). It annoys me to no end that it's not equal and I would love it if someone could give me an idea of why it does this or how I might fix it.