Budget Open Baffle Speaker Recommendation

Hi All,

I've built (not designed) many speaker kits to date and am interested in trying an open baffle speaker.

Since this is my first venture into open baffle, I'm would like to limit my budget to $300 max, for the pair (excluding building material). I have time and can wait for items to be found on the used market (e.g., Eminence Alpha 15a seem to constantly show up).

I'm not too concerned with sensitivity since I have plenty to power amps to work with.

I would like however for this to be an all passive design.

Ideally, I would not want something massive as it has to sit in our living room; however, I don't want to prioritize aesthetics above sound quality (especially since I'm deciding to go down the open baffle rabbit hole).

Any recommendations for open baffle newbie?

Betsy? Lii Audio? Manzanita? Others?

(inventory of random parts on hand: pair of JBL 2226H, Eminence Delta Pro12A, ESS Great Heil AMT-1, SB Acoustics SB17MFC, SB Acoustics SB 29NRX75-6, Dayton 12" Titanic MKIV Sealed Subs - 19mm x-max, MiniDSP HD, and various dome tweeters).
 
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Dayton PS220 or PS180 and any 12 or 15" sub with lots of Xmax for <300Hz. Maybe 2 subs per side. Pretty cheap for what you get.

The Alpha 15a is OK (I have a pair but no longer use them due to their limited Xmax) but don't go super deep. 2 per side might be better. Myself, I use OB down to about 55Hz and cross over to sealed subs below 50Hz. The room is really in control of very low frequency response and I've never had much success with OB at very low (<50Hz) frequencies.