The first DIY loudspeaker I am working on

Of course if you’re going to optimize the response in one particular spot (aka ‘the’ listening position), the driver arrangement doesn’t really matter as you can optimize the response for that precise spot without comb filter problems in the horizontal plane (they would arise off axis though).
 
RCF ND350 is ready for up to the horn, neodymium magnet, white diaphragm.

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I have a question about this picture:

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I know that the beginning of the horn/waveguide should be as close as possible to the sound outlets or the diaphragms. Otherwise you would get a reflection chaos. Why has this been done differently here? Have these combinations of drivers and waveguides ever been examined metrologically?

An example of an AMT with waveguide from Beyma, image from Vance Dickason's Audioxpress Test Bench:

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Many greetings,
Michael
 
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Nice System, but take both super-supertweeters out and keep just the ND350 supertweeter ;). If you may find it is not sufficient from "resolution" or something, try a smaller driver with extended highs like Faital HF111. The additional tweeters may lead to more issues than they solve...
 
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Nice System, but take both super-supertweeters out and keep just the ND350 supertweeter ;). If you may find it is not sufficient from "resolution" or something, try a smaller driver with extended highs like Faital HF111. The additional tweeters may lead to more issues than they solve...
I can only support this: a compression driver on a well-made horn can sound surprisingly good. :cool:

I'd be a little pessimistic if it stayed that way......:unsure:

Best regards,
Michael Michael