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IslandPink wrote:

Do you favour the tweeter horn to be placed at the top, above the mid/HF horn , or in this situation place the tweeter between the bass/mid horn and the Mid/HF horn ? To clarify - Bass/mid is a rectangular Tractrix with about 75x50cm mouth , driven by Fane or B&C . This will be resting on the floor . Mid/HF is a GPA 288H on Azura 425Hz Tweeter a B&C DE35 . Hence the Azura is approx at ear level if just mounted above the bass/mid horn . I can evaluate both options , but advice would be interesting .

Generally the position of the tweeter above MF is preferable. Your tweeter is not a tweeter of narrow vertical dispersion and it needs some room to breathe if it sits between midbass and MF. This need a space for tweeter will put MF too high in relation to eyes level.

However, there are many variables that can moderate this generality. For instance if your MF roll of very soon and you cross HF very low then the output from HF become more identifiable. With GPA 288H in fast opening horn you shall be able to get good 12K-13K, 10K-12K with toe-off. It means that that your tweeter you will put somewhere at 12K-13K, most likely with 2+ order, it means that it’s location will be little identifiable. So, the location of MF shall be your primary concern not the HF.

There is another reason you need to consider. If HF sits above HF then you have only the ridge of MF that fractures the HF dispersion. If your HF is between MF and Upperbass then the HF waves battle two ridges of the horns.

Again, there are a lot of other variables to consider – the proximity of your sealing, what you have on sealing, the altitude of your listening position, the type of the room you have and many others. I still would keep tweeter above. The more free space you have around tweeter the better…

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