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In Reply to: RE: About enclosing the rear. posted by Ian L on November 12, 2024 at 20:48:20
Hi
No problem. For a sealed box, there is less of an ideal size than with vented, however in your prediction, you can see the larger volume gives a response shape with a lower "Q". Generally speaking a Q of .7 to around .6 is ideal and the red curve would be the lower Q of them.
IF one made the box much smaller, you would see the Q rise and that would accompany a bump at the bottom end.
Off hand, any of those curves would be good and not exaggerating anything.I would add loosely fill the back with cotton padding or fiberglass if sealed
IF you use these with a subwoofer later on, the sealed box is the way to go.
Edits: 11/13/24Follow Ups:
just built a pair of these and I am very happy with the imaging and clarity they provide! I have them setting a little above ear level about 12 feet away from my listening chair. They provide a nice "curtain" of sound.
I placed them on top of my Edgarhorns and they sound almost as good as the edgarhorn tractrix horn that have B&C DCX462 drivers in them!
I need to find a good place to set them up permanently, with a sub, to amaze people - lol.
Nice! I am glad you tried it, that is an amazing little driver and illustrates what radiation from a single point in time and space does for the stereo image (makes a strong phantom image). You can EQ if you want and you will hear it's limits if you ask for too much bass.
Next time you feel like trying something, move them closer to you and farther from the walls. If you halve the distance, you raise the peak about SPL 6dB and reduce the "room sound" part of it by around the same amount.
The should present a somewhat different and even better listening experience.
At desk top distance / use, they lack nothing and still don't intrude in the stereo image .
I will try moving them closer to me, perhaps using some sawhorses as a base.
Nice work. Modern drivers are so much more refined as direct radiators or for horns.
Thanks Tom
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