I have an excelent 100W RMS 6" mid Range with an excellent response from 600 to 7500 Hz.

Actually they are tested in direct radiation toghether with a 15" 600W speaker an a horn tweeter; the crossover is set in 1200 Hz an 7500 HZ 12dB/oct. Its sound very well.

For using in exteriors or toghether with two 15" y found that will be necessary to charge the Midrange/s with a horn with cut-off frecuency of 600w (one oct. below the usefull frecuency)

And now the point, and it's I dont know calculate it, y probe with tractrix software but it's not clear to use (for me).

Unfortunately I have failed, for what I'm asking for clear and concise help.

Thanks

have you seen this website http://melhuish.org/audio/ - http://melhuish.org/audio/

he goes through the process of horn design and has calculators on there

i've never actually heard a tractrix horn so i don't know from personal experience however i'm led to believe they have the most natural of sounds compared to conical or exponential

however they tend to have a rather small sweet spot and don't array very easily which in terms of pa systems isn't a very good starting point - perfect for your living room where you can angle them towards you favourite listening chair but useless when you're trying to cover a large area of moving targets!

i would suggest looking into an exponential/conical design as they have a much more uniform spread of energy compared to the tractrix

work out your desired exponential horn then create it out of conical sections (conical in this case just means expanding evenly over the length)

to get the best possible sound you'll need to start from a round throat and finish with a square mouth

this will allow you to cover a larger area more easily and should you need to put 2 cabinets together you'll have less problems