This question comes from an abundance of ignorance.
If you have a tweeter horn with a short throat in the same cabinet as a midrange/squawker horn with a much longer throat and they are both mounted to the same baffle/motorboard, there will be a phase difference near the crossover point which will cause cancellation.
What are the implications of putting a tube (no flare) between the tweeter compression driver and the tweeter horn, lining up the two compression drivers?
I have a pair of Klipsch Cornwall IIIs which exhibit a sharp narrow cutout at 5khz which is where the crossover frequency is between the squawker and tweeter when measured at 39" (1 meter M/L). I have read that tubes are used to create Hemholtz resonators, but I have no idea if this applies here or if there are other things I am not aware of that would muck things up.
If you have a tweeter horn with a short throat in the same cabinet as a midrange/squawker horn with a much longer throat and they are both mounted to the same baffle/motorboard, there will be a phase difference near the crossover point which will cause cancellation.
What are the implications of putting a tube (no flare) between the tweeter compression driver and the tweeter horn, lining up the two compression drivers?
I have a pair of Klipsch Cornwall IIIs which exhibit a sharp narrow cutout at 5khz which is where the crossover frequency is between the squawker and tweeter when measured at 39" (1 meter M/L). I have read that tubes are used to create Hemholtz resonators, but I have no idea if this applies here or if there are other things I am not aware of that would muck things up.
It depends on the horn. There will be impedance mismatches at either end of the tube and sound will reflect at these locations. Both ends must have a mismatch for a resonance to occur. If the horn has a gradual throat profile, the impedance mismatch between tube and horn does not have to be that bad. There will be a mismatch at the end of the compression driver.
Altec Lansing Manta Ray horns are like your description in the horizontal direction. These horns have an abrupt bend so sound will reflect back towards the compression driver on those.
If you want to get the phase response right, note that playing with crossover slopes can also help to shift the phase. As it is about phase tracking between midrange and tweeter, this is similar to advancing or retarding time of the tweeter, which is similar to mounting it more to the front or back of the baffle.
Altec Lansing Manta Ray horns are like your description in the horizontal direction. These horns have an abrupt bend so sound will reflect back towards the compression driver on those.
If you want to get the phase response right, note that playing with crossover slopes can also help to shift the phase. As it is about phase tracking between midrange and tweeter, this is similar to advancing or retarding time of the tweeter, which is similar to mounting it more to the front or back of the baffle.
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it will likely modify response, but perhaps below cutoff. If you can add the length without real modification to the horn or driver, then give it a try. It would be easier to measure than calculate.
iirc, there's ~ a foot extension below.
iirc, there's ~ a foot extension below.