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In Reply to: Re: high end' full range bass drivers posted by Magnetar on September 24, 2002 at 04:22:18:
Magnetar your designs sound verry interesting.I've heard that the efficiency drops below the point where baffle width = wavelength.
How big is the baffle on the PHL 3451 10" mid? what efficiency do you get, and what frequency range do you cover?
300 Hz has a wavelength of about 3ft 7in. I was considering a fixed baffle of say 2 ft (for when not in use), with folding 'wings' about 1 ft long on either side (with say wing nuts to hold in place) to get the baffle to a 4 ft width for good efficiency. I don't know if this would compromise the sound in some way. I've seen a photo on a Dutch website of a full range open baffle using this approach on a larger scale.I was beginning to explore TL options for there reduced rolloff and better dynamics. I've heard briefly of the Karlson type coupler, is it a type of TL??
The JBL 2235H 15's sound very promising. Couldn't quickly locate their pricing - how much are they each?
Yours in innovative design
Richard
Follow Ups:
I've found this chart from Sound Practices to be very accurate. The length is measured from one point of the cone of the loudspeaker to its opposite on the other surface of the membrane via the edge of the baffle.
The response will roll off at 6 db per octave below that to the fs of the driver then it will drop like a rock.The 3451 is 100 db sensitive on my baffle (it's rather odd shaped, will post a picture soon) and is used from 200 to 2.5k with a first order network to roll off the topend and I let the bottom roll off on it's own.
The Karson is a tuned resonantor/ bass reflex box. Excellent bass punch, detail and realism with great "weight" and power. As good or better than any horn loaded bass system I've heard when loaded with the PHL 5230 but much more compact. Mine still pretty big by this forums standards at 4 cubic feet for the back chamber and 2.65 for the front. Here is a link that kind of explains it:
http://home.student.utwente.nl/e.j.j.ulfman/
The 2235H's are no longer in production, Used prices are around $200.00 each and they are getting pretty hard to find.
Magnetar
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