looks a little bit like that:
http://pneu.piringer.net/
joerg
Am 11 Oct 2001 um 20:37, pl1xATearthlink.net schrieb:
> http://www.newscientist.com/news/news.jsp?id=ns99991415
>
>
> Inflatable loudspeakers light enough for anyone to shift could mean
> rock stars' roadies have had their day.
>
> Loudspeakers come in heavy, cumbersome boxes that provide an air
> enclosure to absorb unwanted vibration and give a fuller sound. But
> now two companies, SoundTube Entertainment of Park City, Utah, and
> Ellula Sounds of Loughborough in Leicestershire, UK, reckon an
> inflatable box will do the job.
>
> Conventional speakers have a "driver", which converts electrical
> signals to back-and-forth movement and is connected to a cone-shaped
> diaphragm that vibrates the air. The driver sits on the front of a
> cabinet. To make loud or deep sounds you need big drivers mounted in
> giant boxes. So rock groups need roadies to hump and heave them onto
> the stage.
>
> SoundTube is now developing inflatables that bands can carry flat -
> and blow up when they arrive. The company is cagey about details, but
> a patent describes one way in which an inflatable speaker might work.
>
> A speaker driver is mounted in a flat, rigid board bonded to a large
> bladder. When the bladder is inflated, it expands to form a box shape
> resembling a speaker cabinet. The bladder has several chambers so that
> the whole thing won't collapse if one is punctured. At the end of each
> gig, a vacuum pump sucks out the air.
>
> British company Ellula Sounds has made its own inflatable speakers, on
> sale from November. The company is a spin-off from Loughborough
> University, which licensed the flat-panel speaker technology developed
> by NXT of Cambridgeshire. Ellula's speakers resemble brightly coloured
> audio beach balls and are aimed at the home, for use with portable
> stereos and computers.
>
> this link has got a picture of a home version
> http://www.lboro.ac.uk/service/publicity/news-releases/96_ellula.html
>
> Peter A Lopez
>
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