I had a customer come into my shop today... grand prix gtp, with these in the trunk, boss wouldn't let me turn them up, customer could have cared less. :-( what little bit I did get them up complimented the monsoon system very well... I am really considering doing two of these off a infinity kappa 1200w mono block ran in series as my first upgrade to the system. I have been shopping around on ebay and such for a good deal on a pioneer double din avh-p3300bt... not sure which to do first.... will a new hear unit make the monsoon system sound any better?