Dutch company Thodio offers this A-BOX, a speaker built using an original ammobox. The A-BOX is made of 1mm steel plate fortified from the inside with 6mm trespa and made as inert as possible with vibration dampening material. It offers one 3.5mm jack for connecting audio source.
The A-BOX is available in two models, the the light version with 2 x 25 watts rms amplifier and woven glass fiber speakers (carbon color) and the heavy version sporting 2 x 70 watts amplifiers and woven kevlar speakers (the yellow material used in bullet proof vests). They are priced at Euro 250 and Euro 350 respectively.