There's nothing wrong with either the design or the HF drivers. I did my homework when I built the system. The horn tweeters are line source and have a wide horizontal dispersion. However, I just don't like the sound of the horns in the top octave.
You're right about the difficulty of aligning the horn tweeters and supertweeters. Putting the supertweeters above the horn tweeters might work.
It looks like I'll need a conventional two-way crossover to avoid phase problems. I'll have to experiment with the crossover slope and frequency and see what I can get away with.Part of the problem is the crappy EQ in the dbx DriveRack that I'm using as a crossover. It's not really suited for CD compensation. I have a bunch of stereo console modules with 1st-order shelf EQ, I'll have to rack one and use it on the output.
I built a 3-way system (subwoofer, 2-way mains with horn tweeters, active crossover) and I'm not happy with the sound of the tweeters. They use constant directivity horns with the proper 6 dB/octave treble boost. I'm planning to add a column of direct-radiator supertweeters and use a passive crossover so they're fed from the same amp as the horn tweeters.I'd like to use a single capacitor as a 6 dB/octave high-pass on the supertweeters, and nothing on the horn tweeters. Then I can use an L-pad to dial in the right level on the supertweeters, so the system as a whole has flat treble response without CD compensation. Will this work? Will the horn tweeters lose any treble with this arrangement? Am I going to run into phase shift issues, or do I just reverse the polarity on the supertweeters?I might put the L-pad on the horn tweeters instead, because they're more efficient.
If you don't like the sound of the horn, then there is a problem with the design. You are considering fixing that problem by adding some "supertweeters". A better fix would be to try a different horn and/or horn driver.
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