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By “midbass horn” I’m talking about a horn with about a flare frequency of about 60 Hz,
to use with Fane 8” drivers, to start with.   

 (Was planning to use this horn from wherever it sounded best, trying for around 80 Hz to ~350 Hz). 
I was planning on using a slow opening (exponential) for this horn. 

I noticed you used a tractrix. 

I didn’t think one could “get away” with using a tractrix down this low, without major penalties in sound quality.  
The tractrix is attractive in that it is much shorter…

Have you tried (heard/listened to) both? 
I was planning on fixing this horn to the ceiling anyway, which helps get it out of the way somewhat, but it is still seems a problem to place everything (time aligned) without the mouths in front getting in the way of wavefronts of the mouths behind them. 

When I ask about the “ultimate driver”, I was referring to what you started this "The ultimate upperbass?" thread with: 

Romy the Cat wrote:

I think the ultimate length of the upperbass horn is 3”- 4” throat. With longer horn it would be very complicated to time-align it as the horn will mask out the MF driver.  The ultimate driver for upperbass should be a compression driver, low to medium flux, with no face plug, most likely with aluminum cone and resonant frequency ~20-50Hz below the horn rate. I personally do not know such a driver, if someone do then let me know… The Cat

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