The bench was on display at the Urban Play event 2 in Amsterdam, Netherlands, last month.
See a movie about the Boombench here. The following is from NL architects:
For the design of the ‘Boombench’ NL architects transformed a regular piece of street furniture into a sound system.
This seemingly normal street bench reveals its hidden gimmick when it is activated via Bluetooth, allowing the public to play the music on their mobile phones.
Street furniture becomes ghettoblaster and passer-by becomes DJ.