iPod - Bicycle - Boombox recommendations wanted
I'm still looking for a small boombox. I've had several X-Minis but I'm looking for something a bit more powerful.
- To be carried on a bicycle so must be fairly small and light.
- Fed by an iPod Classic so 3.5mm jack, I don't need bluetooth.
- Rechargeable battery. Needs to run for a few hours at full power. 
- Bass weight is as important as overall volume
- Cheap is good, obviously. So not silly money.
Any recommendations?