Music amplifier for iPhone etc, cheap or free.

I just stick mine in a coffee cup! :c
Amazing how much louder it is. I also do that to better hear someone you are just talking to.

You'd think for what we pay for an iphone it would have a better speaker. The speakers are the same ones that were used in the first flip phone! Bose, I want a Bose speaker system built in on a phone I pay that kind of money for!
Check these amplifier tests out from a toilet paper roll to 2 paper cups! What a hoot!

http://lifehacker.com/5912474/the-best-free-diy-smartphone-volume-boosts

I agree, it's just a proof of concept.

I have no need for one but I will play around with different tubes. What would a 3" cardboard mailing tube sound like?

A resonant chamber
I'm sure the bamboo sounds better than the pvc
Pc does not have the same acoustics as bamboo and wood