On 2 Feb 2012, at 03:13, Jeff Flowerday wrote:

> 
> My current floor standing speakers are +-3db to 40hz but will extend
> down to 33hz as per specifications.  Who knows how much roll off.

You could check the roll off, if you wanted to, using this:

http://www.realtraps.com/test-cd.htm

and a Radioshack SPL. Only a rough guide but might be interesting nevertheless.
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