Pablos49, I have three speakers in the truck, one in the grille and two behind the seat. If I tune out the one in the grille, I can hear the other two okay. They work good if you balance and fad them. Only problem with going to a motorcycle battery is that the radio has a light that stays on all the time and it will drain the battery in about 3 days. Then have to charge again. To remedy that, I put in a shut off button. Only problem there is that I lose all my presets, clock, balance and fad, etc. Any suggestions to fix this problem.