I have a 300.4 currently and am looking for more power for my dls ur6s. Would I notice a difference between these two models. I cant seem to get rid of my engine noise and im wondering of it isnt the amp since ive had noise in two vehicles now. Car domain price matched it down to $190. I only have one 1200.1 on my subs. The next option was the 600.4 for 300 but Im not sure if they will price match that one or not.