Ok so I have the opportunity to purchase a maching linear power amp for my sub. It will be powering a 15 on 500rms. Which amp model would be best for this. The guy has a 1502 1752 3001 which all do around 500 to 600 watts. But the 1502 he is charging a hundred less for some reason. I would think the 3001 has a better build quality since the foot print is a little biggerr but I dunno. Anu help is appreciated thx.