I would check what Wayne said as well. Eigth space modelling or infinite horn modelling is definitly not what you want to do on a mid horn, it'll show a lot more bass than its really got. I bet that's what you've done. Set it to 2PI instead. 7" length is 1/4wl of 480Hz so this will be the lowest usable point. Depending on mouth dimensions, usable response may start at a higher frequency than this, but the right dimensions will let you use it to 480Hz.
I'm interested in what your doing - what driver are you using on this horn?
I've used Eminence Alpha 6" driver on tractrix and conical horns with success from 300Hz-2KHz.
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