Hi I have an open boat 27 ft, with a good sound system, but I don't feel that it is sufficient, I want more power and good sound, I currently have an aplificador of 700 watts, 4 speakers pay marine 6 x 9 and two 8 ' subwoofer and two speakers of 6 x 5... I use two batteries 27 marine, with a Perko switch one instrument and one for the engine... just use my ipad with an amplifier pre pay Marine to amplify the signal coming from the ipad to the ampli .
I see that there are boats with 2 amplifiers and many more speakers, how do they do with batteries.? Do they load them hours on the beach when the engine is off.

Thanks in advance

Sounds like too many speakers for the amp. Have to match rms power for speakers to amps. Forget peak of each. Rms is most optimal