Best waveguide under 17.75x6.75" mouth for The Selenium D220Ti

[StainlessSteve]

What is the best sounding waveguide/horn with a mouth under 6.75x17.75"? I am going to use it in a two-way with a 15" woofer and the closest distance it will be from the edge of the woofer is 2". The 15" is tuned to 65hz and can play up quite high but I do not want it to beam. So the ideal waveguide/horn will allow the driver to play down to the woofers upper end beaming frequency with 2" from the center of the surround and up to at most 20khz (but less would be acceptable, such as 17khz) This is the 8 ohm version.

[StainlessSteve]

Don't know if this is exactly forbidden or not, but since nobody has replied and I've got plenty of views I'm bumping this

[silverprout]

Originally Posted by StainlessSteve

What is the best sounding waveguide/horn with a mouth under 6.75x17.75"? I am going to use it in a two-way with a 15" woofer and the closest distance it will be from the edge of the woofer is 2". The 15" is tuned to 65hz and can play up quite high but I do not want it to beam. So the ideal waveguide/horn will allow the driver to play down to the woofers upper end beaming frequency with 2" from the center of the surround and up to at most 20khz (but less would be acceptable, such as 17khz) This is the 8 ohm version.

Hello.
Best sounding is pointless. you should specify the dispersion that you are looking for.

[StainlessSteve]

No, it's not pointless because that's all I'm looking for along with something to fit in that size. I don't want high order modes, I want the horn to do it's job. You have to understand that many drivers that fit the same waveguide but do not sound the same, and can vary in the extreme. This is because almost every compression driver has a different distance and rate of expansion from the diaphragm to the exit. Perhaps I should be asking what's on the inside of the D220Ti.

[LineSource]

There are several years of EconoWave discussions involving the 1" Selenium D220Ti and different horns + midbass. There is data plus listening tests which prove that getting decent sound from the Selenium D22Ti 1" compression driver with a 15" midbass is difficult. A 12" midbass with a 1200-1300Hz crossover using the SEOS12 or SEOS15 is the common choice.

Remember, for controlled directivity through the crossover frequency, you want the polar pattern of the midbass to match the polar pattern of the horn. So, start by reviewing the polar pattern and any cone breakup distortion of your 15" midbass at 1000Hz, the lowest usable frequency for the D220Ti. YEP, very difficult with a 15" midbass.

[silverprout]

Originally Posted by StainlessSteve

No, it's not pointless because that's all I'm looking for along with something to fit in that size. I don't want high order modes, I want the horn to do it's job. You have to understand that many drivers that fit the same waveguide but do not sound the same, and can vary in the extreme. This is because almost every compression driver has a different distance and rate of expansion from the diaphragm to the exist. Perhaps I should be asking what's on the inside of the D220Ti.

Sorry, i probably should not say it like it, i'm always have in mind that the listening distance is the most critical parameter with horns and the "best" horn is not always the best choice.
i've recently read that the theorical that the pistonic beamng of a 15' driver is 1052Hz.

I've verified it with a 10', the theorical beaming is at 1700Hz
Nothing seems to beat the physics.
(0°-6°-12°-18°-30°)