A:Answer I wouldn't recommend this amp for your 15" L7 unless its rated at 600rms or lower. My 15" L7 does 1000 rms, so you want the 1200.1 amp and wire it for 2 ohms. This 600.1 amp won't be able to push the L7 to its full potential and I'm not sure if the 600.1 amp will get really hot, since you would be pushing the amp to its limits trying to push the L7. I try to make sure my amp is rated a little bit higher then my speaker. I can always turn down my amp to match the subs power rating. I hope this helps you out.