Basta! pretty much agrees. 17.9L tuned to 46Hz

But, also allows for an approximation if room and baffle are included:

If the cab is reduced to 15L and tuning dropped to ~45Hz (still including room and baffle):

Noticeably less peaking at 50Hz.
For completeness, here is the 15L box without room and baffle:

I've built many (too many) speakers over the years and I recently found Basta. The ability to include room and baffle effects has accurately predicted issues I have had with previous designs.
Basta also allows you to specify and include notch filters in the predicted responses which have proven to be very accurate when I went on to measure their impact in the room (TBF, maybe WINISD does this too now?).
Anyway, sorry for the hard sell on Basta. It's free, it's available for download and, for me, it has been an even more accurate tool than WINISD. Maybe helpful to some people.
Cheers,
iep

But, also allows for an approximation if room and baffle are included:

If the cab is reduced to 15L and tuning dropped to ~45Hz (still including room and baffle):

Noticeably less peaking at 50Hz.
For completeness, here is the 15L box without room and baffle:

I've built many (too many) speakers over the years and I recently found Basta. The ability to include room and baffle effects has accurately predicted issues I have had with previous designs.
Basta also allows you to specify and include notch filters in the predicted responses which have proven to be very accurate when I went on to measure their impact in the room (TBF, maybe WINISD does this too now?).
Anyway, sorry for the hard sell on Basta. It's free, it's available for download and, for me, it has been an even more accurate tool than WINISD. Maybe helpful to some people.
Cheers,
iep
I tried basta, but i don't like how it works, and it does not run stable on my systems (win 8.1 and win10). I use mainly winisd and often also virtuixcad
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Have you considered line array + subwoofer? My thoughts are the 5" you will not like the highs that much. The off axis treble response will go worse and it won't be as crisp. Put 4 in a line you will have higher efficiency and better power handling.
Oon
Oon
4 in a row would be 8 drivers! That would probably bankrupt me 🙂 Plus, that would be a big cabinet. I'm really looking for a bookshelf or small floorstander kind of format.
Appreciate your point on 'beaming' but, at the same time, the single driver feature of my tang bands is probably the thing that makes them so appealing to me.
Cheers,
iep
Appreciate your point on 'beaming' but, at the same time, the single driver feature of my tang bands is probably the thing that makes them so appealing to me.
Cheers,
iep