I find this to be very strange.
I have two kicker L5 15"s in a sealed box powered by soundstream PCA2000d. I have 1/0 gauge power and ground wire to the amp along with the big 3 upgrades done in my car. When I play the L5s they get loud. louder than my memphis Power reference 15s. I dont understand is when i hook up my memphis subs with my kickers down to a 0.66 ohm load on my amp, it slams! and my amp sucks a whole lot of power. then when i hook up only the kicker L5s alone down to a 1 ohm load (which the amp is 2000w rms @ 1 ohm mono) on the same volume level, it doesnt draw as much power. my volt gauge stays @ 13.5 - 13.9 with the kickers only. but with all 4 subs hooked up it drops to 12.3 - 12.8.
I dont know whats wrong with my kickers or my amp.. someone help me..
the solos alone are supposed to handle 1500w rms and my lights dont even dim nearly as much as when i have all 4 hooked up. is this a subwoofer or amp problem??
lowering your ohms when you have both subs hooked up will draw more power out of your amp. did i explain that well enough?
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SSounds
When you hook up all your subs you said you brought it to a 0.66 ohm load, right? This means you are drawing more power at .66 ohms than at 1 ohm. This means it takes more power to make this extra power. It's also not the greatest idea to run an amp at a load it isn't recommended for. I think that is what ssnds was saying.
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That's my opinion. Take it, leave it, or correct me.