I have a few questions.

1. What is the port frequency? There was more output below 125Hz so I assume it was 60Hz or thereabouts?

2. How do you decide what frequency to port? Is it mathematical using T/S parameters or is it empirical cut and try? If mathematical, how do you determine how much parameter offset from horn interaction? What I mean is the T/S specs will shift and Fs will drop when installed in the horn, so shouldn't calculations use the shifted T/S values?

3. What measurement system do you use? What software do you use to make your response charts?

Thanks,
Ralph