On 02/26/2010 06:42 AM, Bearcat M. Sandor wrote: i don't understand. if you mean "can i blow up a stereo signal to use my four speakers", the answer is yes. if the question is "can i blow up a normal stereo signal to use my four speakers so that the result makes sense", the answer is a cautious "probably not". but the same applies to ambiophonics. if there is no surround information, you can't expect good results. there are a few stereo recordings done in UHJ format (most by small UK classical label nimbus) that do indeed contain ambisonic content that can be decoded to 4 speakers with great results, but they are rare. nimbus is still in business, though, and they maintain their back catague. i can mail you a track or two off-list if you're interested. another interesting approach might be "super-stereo", a feature which some old hardware ambisonics decoders contained to make stereo sound more spectacular over 4 speakers. but i have never tried it - if you're interested, i can wade through my archive for the decoding matrix. and there's an excellent MAG article about using 4 speakers for better stereo replay here: http://www.audiosignal.co.uk/Resources/Surround_sound_from_2-channel_stereo… nothing to do with ambisonic decoding, though. best, jörn