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I'm assembling hardware (laptop, interface, speakers, ...) for a small demo setup which is meant be easily portable, so as to be able to pack it into a flightcase and quickly put it together for demoing purposes (e.g. in front of a customer, at a convention etc.)
I'm quite unsure which way to go regarding speakers... do you know of any small-sized monitors or monitors which are not low-quality HiFi/PC speakers but on the other hand aren't too heavy to be carried in a flight case and offer a reasonable frequency response?
Should I give Bose and the likes a try? Any suggestions?
It depends what kind of material will you be needing to broadcast? When you start talking about active monitors weight does become an issue. You will find that even compact active monitors will be considerably heavy. Passive monitors will generally weigh less but will need an amplifier. From my days of working as an AV technician, I would recomend the Fostex 6301. They are compact in size, weigh 3KG, which isn't too much, and are pretty good in terms of audio quality and amplification (they have built-in 10W RMS amps). I've used these in similar situations to those that you describe, but as I first mentioned, it really depends on what you will be broadcasting and the acoustics of where you will use them...
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If you're talking about at a convention, you may want to consider a headphone distribution amp and a bunch of headphones (i.e. Sony MDR-7506). It's just an alternative idea that may be more effective.
As Colin mentioned, it really depends on the situation you're planning to use them in. I can vouch for those Fostex speakers as well. They're not bad, but if it's a really noisy environment no speaker with the dimensions/weight you're looking for are going to be all that helpful to you (including those Fostex). With speakers you're going to have to carry some weight, either in the unit themselves or in a power amplifier. Those power supplies aren't feathers. ;)