i just came from a car audio shop, with the intent on hearing some eclipses. He had jl's, but he harped on a diamond 12 tdx and a jbl gto 12 subwoofer. I told the guy that all i had was a mrd-m605 amp, which was rated at 640 watts @ 2 ohms. He said that even with this amp i could hook it up to the diamond and hear a big difference. i think this sub is rated at 1000 rms or something like that. He also wanted $500 for it also which is crazy. I was just wondering if anyone has any experience with these subs, and would it make sense to underpower the sub like this? would a jlw6 400rms be a better alternative, and eclipse ti 750rms, if I choose not to upgrade the amp. he also said that the w3's are pretty much useless running them in a sealed box. Any input would be appreciated. peace.