Have got to upgrade the Infinity system in my SRT6 Roadster. Plan to replace the HU. Looking at all the threads on subs etc. and thinking you all must have Coupes. I notice two speakers behind my seats but assume that they are just regular speakers and not subs. Am I correct? If so I guess I should just get a decent HU that puts out 4+ amps and not worry about seperating anything? Please advise.