I have two 200-watt, 8 ohm speakers. What PA head do I buy? [more inside]
posted by rumsey monument on Apr 23, 2009 - 14 answers

Help me build a bicycle powered water pump. [more inside]
posted by electroboy on Apr 9, 2008 - 21 answers

Looking for a portable digital recorder that is as small as possible but has a powered 1/8" stereo mic in (for a binaural mic), records uncompressed PCM at at least 16-bit 44KHz, has removable storage, and does not need special software to transfer and deal with files on a computer (e.g. it should record direct to aiff or wav on the card.)
posted by neustile on Feb 20, 2008 - 18 answers

I have a need for a CCTV system in an area with no power or wired connections. The images/video would only need to be retrieved in the event of a break in or something of that ilk. What are my options? [more inside]
posted by lemonfridge on Dec 14, 2007 - 2 answers

What could be the most viable environmentally friendly car? I some how focused in compressed air powered cars. [more inside]
posted by curiousleo on Mar 12, 2007 - 19 answers

I recently acquired some Altec Lansing powered speakers that are loud enough that I don't have to keep my MP3 player and Windows volume settings at maximum in order to be able to hear anything. So what should I set them to? Should I mainly rely on the external speaker volume knob?
posted by grouse on Nov 25, 2004 - 14 answers