Low freq. from small drivers? Is it possible

It is absolutely possible even without a port.
Karl E. Schuemann and the ultimate monitor have accomplished this very very well, at least in my system.
http://www.theultimatemonitor.com/default2.htm

Best Regards,
Michael Wolff

Yes, there are many speakers that can get to the 30hz range with those 6.5" drivers. VBT has a claimed frequency response of 18hz(-6db) with one of their subs using a 6.5" driver.

There are tradeoff though. A 6.5" driver generally can't play as loud as a 10" driver before breaking up. Second deep bass in small boxes generally means lower effeciency. So yep physics still applys.

The key is to move a large volumn of air. If long throw woofers are used then they don't need have as large diameter.

Speakers with only one 6 inch bass driver (mid-range really) are not going to move enough air for output into any room larger than a small car trunk even at 35hz.

Ported speakers only add SPL pretty much and are a poor choice for bass output IMO.

If you need (want) deep bass don't start out with a design that is compromised from the start....OR, you could say, don't send a boy to do a man's job.

Dave

I heard amazing, deep, tuneful bass down to 30hz and then some from a 6.5" woofer in the Merlin VSM-MM. And this was in an approx. 8000 cu. ft room. They really did blow my misconceptions of what a small woofer could do in a well designed speaker. It was an eye (ear) opener.

Cheers