"TonyL"
Phil Allison wrote:

Be better use a 75 litre box and tune it to 32 Hz - response is
then +/- 1dB from 105Hz to 32 Hz and down by 3dB at 28Hz.
A pair of 82mm x 345mm ports does the job.


Thanks Phil...got the idea.

This is more of a fun/interest project for me. Not sure if I really need
more extended bass since my existing studio monitors came with individual
'calibration certificates' showing almost flat responses down to 50Hz.
Might be good for rattling the windows I guess.


** Response curves alone prove nothing about a speaker's ability to produce
high SPLs at low frequencies. The latter game depends entirely on effective
moving cone areas and the use of tuned vents as sound producers.

Even in a typical domestic loungeroom, anything less than a 10 inch driver
in a ported box is a joke.

For use with action movies on DVDs, 15 inches is the minimum.

Size does matter.



..... Phil