Thanks!! ive owned a alpine 1507 for the last 10 years (which ive sold now). so its a bit of a step up from running two 500 watt rms subs (being alpines) to a 2000 watt rms sub, i was just asking for advice about the subs/ brands. which ones to stay away from. i guess i should just look at all the good brands to see what suits me best which i will do now! as for the installation i know how to install i know wiring i know boxes so those parts of the install are ok. the only thing thats different is i got to upgrade my electrical system so it can cope with the power being drained when i turn the volume up. other than that everything is the same. and thats one thing i would be doing right!! im sorry i didnt speak more clearly for u all in my first question i just wanted to know the best 1000 or 2000 watt subs for my new amp. 2K rms is new to me.