mt121 new build

ive never quite understood how comp drivers can sound so harsh (and to me a lot of them do) as effectivley it is just a driver inside a small ported chamber, is it because of the high compression ratio or something else?

Even easier than wood and string - bung a spare bit of open-cell foam or towel in and line the sides paying careful attention to the mouth. For a quick test, just wrap a towel round the inside of the mouth. If you're really interested, cut a foam plug the shape of the horn and insert. You can also try it with normal horns that 'honk' too much.

If the mouth ends too sharply, whip out your router and sander, but that's another story.
The reason why a compression driver can sound harsh is down to a variety of things:
It could be the horn
It could be the diaphragm material (metal vs phenolic, different breakups, etc)

Ease of design? Well, that's easy when you buy your own horn and driver.
But designing a good sounding horn is about as hard as doing a phase plugged mid.
And a good sounding horn is what makes all the difference (to an extent).

Actually, if you think about it, compression drivers are actually just diaphragms (which act more pistonically blah blah) on a phase plug with a high compression ratio (usually a tangerine but sometimes an axial, then usually that assembly leads onto a throat tube with gently sloping sides. You know, the martin F2 '5.5" compression driver' was actually a 12" driver that was in a big compression driver type enclosure. In fact compression drivers do have t/s, it's just a matter of getting them. You can actually model a compression driver + horn on hornresp, and the power response is accurate.

Then there's the planar wave and directivity thing.

So after a few hours of coming up with ideas and working out size, length, and angles i set about making a wooden mould.

Filler was then added to smooth out the flare. And the first coat of under coat added.

will do cheers mate

to day i have been playing around with arta, the plots dont look right to me i think its something im doing or not doing, ive not used this software before any idea guys.