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20dB of Boost ?

"If you can eq the horn, I think you will find that you don't need a separate tweeter "

The DH1012A starts to roll-off at 2.5Khz at 6dB/oct to about 6Khz, then at 12dB/oct to about 12Khz. Therefore, about 8dB of boost is required to 6.3Khz, and an additional 12dB from 6Khz to 12Khz, or a total of 20dB of boost.

The E140 in the 816 will be about 106dB, the HR9040 with 1012A about 112dB. Therefore a passive crossover may be made to pad and EQ the HF flat to 6Khz or so, and cross the tweeter over in that region.

With an electronic crossover and a complex pad/filter with about 25dB insertion loss, it is possible to EQ this horn/driver combo to about 12.8Khz.

This seems rather pointless.

If a two-way is wanted the Altec 288G (or newer) will produce much better results, or an EV DH1A with the adaptor removed.

I can give some tips about passive EQ/pads if need be.

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