After blowing both my Polk db 522's via RF PB300x2, I ordered and am waiting for pair of Biketronics Titan II 6.5 speakers ($270 Lifetime warranty) to be delivered. Came across these SavingLots.com - POLK MM652 I would have pulled the trigger for $141.50 OTD. I know nothing about this outfit. Nice specs, but I had Polk regret at $200 (Amazon). Heads up to ugraders.