[Boatanchors] Info on acoustically tuned loudspeakers?

[Sandy]

Anybody got any data on calculating dimensions of tuned speaker tubes?  I 
'hade" some data somewhere, but lost it.....dammit.

Need to take a small round speaker and build a CW "filter" for around 700 Hz 
or so.  Last one I built was 10 years ago and it worked really well without 
a lot of "ring".

73,

Sandy W5TVW

PS:  Have a used but excellent FT-990 that was given to me and it works 
super although it is kinda big for the small desk in my bedroom!  Been 
hanging around 7050 afternoons and sometimes on 3546.5 or so early evenings. 
(01-03Z about)