I'm building a stereo system to mount onto my bicycle and play music from my phone.
I have two OEM car speakers (8 Ohm) and I need an amplifier. Car amplifiers are too big and the head unit I got for free from a friend draws a ton of power and adds a lot of weight.

I thought a motorcycle/marine amp like this ( http://www.amazon.com/TeLi-Hi-Fi-Stereo-Audio-Amplifier/dp/B008D2EL7U/ ) might be a good idea. I don't know enough about this sort of stuff, so I just thought I'd ask around for suggestions before going and buying something that might not even work.