The consensus at the time was that the 603 was a much better sounding speaker. I never heard the 603 but I did own the DM640's. The 640 has a nice kevlar midrange driver. The woofers are boomy and inefficient. They need quality power to bring out the bass. The tweeters are very hot. Bottom line: The 640 sounds lifeless at low volume and decent but ear bleeding at higher volume. Image focus is poor to nonexistent. Nice midrange.
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