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Mjloudspeaker,

That is all fine. I get that you like them, even though said nothing about the “new” M4 sound. There is another “even though”. You do not log it into horn and like just the sound of open driver. It is absolutely not indicative. Perhaps you can predict how the sound of open air driver gets converted into sound of horn loads driver.  Good for you because I never was able to do it.

Next thing is the application. I do have doubts about your findings. You keep stressing how much you like the driver but you are falling to answer 3 inquiries about the ways how you use the M4.   If you have 100-150Hz hour and use something like Fane 8M then you have 86Hz primary resonance from Fane, drive it up to the mouth rate and have a good preliminary match. M4 in default setting has primary resonance I presume around 100Hz higher then Fane so how you will be driving with it 100Hz horn.

http://www.communitypro.com/files/literature/spec%20sheets/M4_SPEC.pdf

The removing the phase plug and exit channel is fine but it itself is not a lot. You need to construct the new mounting plate, find a way to convert the new driver exit into the throat of your horn, load the diver into horn, redo the back chamber in order to accommodate the new load.

http://www.rentcom.com/wpapers/commun/cover.html

http://www.hamran.org/audio/Community-M4.html

Only then I thing you can make assumption about the M4 sound. It is very possible that after all those modifications you will not be able to use M4 in a horn lower then I would say 180Hz.  Sine you did say that you did not like horns and presumably did not have a lot of exposure to them in past I would presume that you findings about the M4 driver are premature.

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