I have noticed a few threads on how to create a bicycle stereo. I googled it a while ago and didn't find any good resources. So through trial and error I have created my own bicycle stereo. I also created a website with easy to read instructions on exactly what I did:

https://thezoed.googlepages.com/home


enjoy!

Congratulations, you have invented the boombox.....welcome to 1970....lol

In all seriousness for the amount of stuff you are carrying why not just buy a small boombox and put that in a backpack?

I say just get a sonic impact T-amp, gut the amp from it's housing...place it inside an altoids tin instead, and put all the connectors on the tin.

Buy some indoor/outdoor speakers...$10/pr for KLH with a 4" woofer...3-way design. Use the mounting brackets to put them on your rear or front rack. Mount the amp nearby it. Use normal speaker cables to the left and right speakers. A standard patch cord to go from source to amp.

Now...for amp power...12v....12v scooter battery can be rack mounte as well....and provide over a week's worth of amplified goodness (these things get about 40 hours off of 8 AA batteries)

This is not only far louder than the computer speaker route, but also far more versatile....you can get a 12v wall-wart adapter and use this in your living room...T-amps put out more power than you would think.

It is a bit pricier though. I was thinking of doing this for quite a while as a joke, since I already have a T-amp gutted from it's case on my project bench.

My Gosh!! MY bike stereo cost me all of $50.

I used a pair of self powered speakers and a walkman or older cd player.
sure you use a few AA batteries but is sure weighs lots less than a wet
battery set up. safer too.

Heh, that's about what a T-amp/speaker setup runs...add more for the MP3/walkman/discman though.

I've carried speakers in my panniers before with the T-amp in there as well, and used it for bike-tailgate parties...loud enough for it...little thin on the bass though.