Did a tone test on the homebuilt speakers. Started with 100 Hz, then 75Hz and 50Hz, all sounded well defined. As did 45 Hz and I even got a solid output at 40Hz. 35Hz was audible but reduced and doubling was evident. No clear bass output at 30Hz.

A decent showing for a speaker with a 3.5 inch wide cone.

I did find that I can still hear up to 13kHz. Surprised me.

The 1/8 wavelength acoustic line is tuned to 40Hz and the driver resonance is quoted at 45Hz, so the port resonance falls slightly within the driver roll-off, which is OK.



(yes, I know the ancient carpet is horrible! )