garold
i have them hooked up to a JL e4300 which is only rated at 45x4 at 4-ohms (bridging 2 channels to a sub), but that rating is pretty conservative from what i've heard. they sound incredible. i don't know about hearing them while you ride though. i'm sure plenty of people here would tell you they won't work for that. i simply can't answer because i haven't had my boat out yet.
listening while riding wasn't/isn't a priority for me right now. sounding good in and around the boat and also looking good and matching my interior speakers was important to me. they are pretty loud though. maybe if you had 4 of them up there?!
i'm taking the boat back in a couple weeks from now to exchange the e4300 for an e6450 6-channel (same rating) and adding a JL 250/1 and a 10w3v2 sub to replace my current 10w1v2.
it's gunna rock!
anyway, i can't say enough good things about ronnie and his product. they're sweet and i'm really happy with them.