definatly need the amp. The internal amp is not robust enough to power the Kappas. Sound starts breaking up around 26 on the volume.
I want to use the 4volt RCA's from the Aquatic head unit so I am looking for amp suggestions.
Joe are you only powering two speakers? Take a look at the Cerwin B52.
I had ordered the B54 with the intention of just using 2 channels, but, for some reason or another I got the impression that I could not use the preamp output on the Aquatic. I sent the thing back. I will order the B52 and see how that works or do you think the B54 will perform just as well and leave the possibility of adding rear speakers or lower fairing speakers down the road?