Motional Feedback Subwoofer

[bentoronto]

Originally Posted by forr

Russel Breden is definitely Jeff Macaulay.

I just discovered it :

jeff macaulay's audio amp designs

Funny, in that little article (the old reprint), he covers just about all important points on the topic. A great primer on voice-coil derived MF.

But one curious error of omission. You can't use voice-coil derived MF on any suspension except a sealed box (and on a good day, maybe also open baffle). The reason for that actually illuminates one of the reasons some of us don't like any suspension except for sealed box (and maybe OB): in those other suspensions, there is no plain relation between cone motion and output... which sounds, to my ears, like an awful drawback.

BTW, a Klipschorn has a sealed box behind the cone which makes it sort of OK for voice-coil derived MF.

I haven't thought this through, but after reading the article, I realize there may be a correct woofer diameter where the you are driving the air, throughout the range of interest, with a falling radiation resistance due to small cone size. Not sure if that is like 10 inches or 30 inches....).

This thread has many readers, indicating wide curiosity. If you try voice-coil derived MF, you'll be amazed at how wonderful, broad, flat, tight, it makes the bass. But remember, when you traffic in new feedback loops, things can get loopy (and destructive). DAMHIK.

Ben

[forr]

Bentoronto seems to have posted a message here today. I can't access to it.
I'am here page 2, clicking to the gadget to access to page 3 goes back to the first post of page 2.