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serenechaos wrote:

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 have my motivations to go for Tratrix but do not forget that my horn is 115Hz not 60Hz and it sits under and in front of MF channels not above or on side. For 60Hz I think I would go for slow opening and locate it on the side, unless you have you original idea how to locate 60Hz horn within the limited and prefixed height of MF channels.  Be careful with idea of using the Fane 8” drivers (I presume it is the Studio 8M) for 60Hz horn. The Fane has 68Hz it’s resonance frequency and it will be a huge starch trying to use this driver in 60Hz horn. I afraid the driver will be suffocated. The Studio 8M in open air goes down to ~450Hz and  down to 150Hz in sealed box. Loaded into 4” and compressing it with back chamber it get EQed down to 110Hz. You migh get out of it another 10-20Hz by beter horn EQ but it will be I feel a huge compromise. Search for your  60Hz horn another driver with open air resonance of around 35hz-50Hz.

serenechaos wrote:

I didn’t think one could “get away” with using a tractrix down this low, without major penalties in sound quality.

I agree but I would not insist that it is true. It is controversial as “sound quality” is not the same as bass extension.

serenechaos wrote:

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

I see. I was talking not about an “ultimate driver” but an “ultimate driver for a given horn rate. This is very different and I very much agree with what I said in there. For your 60Hz horn try to find an above 100dB sensitive 10-12” driver with Fs of ~40Hz, look at throat of 6-7” and use the driver as a compression driver. Do not ask me specific recommendations what driver to use – I honestly do not know.

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