From Newsgroup: rec.music.gdead

On Thursday, October 14, 2004 at 5:02:25rC>AM UTC-4, the wharf rat wrote:

What is a double e waterfall?...Ive always wondered that..

A Bass violin, a standup bass, is tuned so that it's
lowest string sound "double E", third E below middle C. A double
E waterfall is a waterfall that's so big it sounds the lowest bass
notes instead of the tinkling upper registers or more subtly moving liquids...

I always pictured the double E image as a standup bass too, with the S shaped sound holes looking like two waterfalls on a woman's back and the strings along her spine.
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