http://www.recording.org/e-mag/article_102.shtml
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Apparently they're not in production any longer because the cardboard used for them is hard to find. MSP5 is Yamahas response to its cancellation and according to this revue, they're better by adding more highs and lows, just not the mids. 319 usd too. I think I'm going to get some.
http://www.recording.org/e-mag/article_102.shtml
http://www.recording.org/e-mag/article_102.shtml