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In Reply to: RE: substitute driver for Adire 15" passive radiator posted by Mr. Dick Hertz on July 06, 2015 at 08:22:13
I'm not a huge fan of passive radiators. They're basically a variation of a port with a plus of keeping more of spurious radiation in the box than an open port and a minus that they have lightly poorer damping of overhang than a port.
However a great choice of passive radiator might be the SEAS SL26R. It's designed to easily add weights to it making it simple to fine tune the response.
Follow Ups:
Thanks so much for the responses! The SEAS looks very nice indeed. However, from my understanding of passive radiators (which is not much...)I thought that the passive radiator was supposed to have a larger surface area than the active woofer (12" in the case of the Shiva). Is this not correct? Can one use a passive radiator of the same or smaller size than the active driver?
Also, how do I determine what I want the resonance frequency of the box the box to be so I can calculate the weight to add to the passive radiator? IS this just a matter of taste with respect to how low I'd like the sub to play? For example, the 12" ScanSpeak passive radiator at Madisound has a free air resonance of around 9Hz. Does that mean (theoretically) I could tune the box to 9Hz?
Thanks so much,
Chris
The PR can be same size as the woofer...or larger. For instance,
the JBL PR15 (15") was designed to be used for a 15" D136 I think.
Depending on the alignment, the PR may need to have a volume displacement of up to 3x that of the woofer.
The EV Interface A had a driven 8 and a 12 PR with 400 grams mass. In use the PR could visibly move much more than the 8 did, even though it had about 2.7x the area.
The poster "boodles" needs the info, reply to him, not me?.
nt
Edits: 07/07/15
My experience with PR's has been a positive one. I owned a pair of Shahinian Obelisks with PR's and they were wonderful. My current subs have used the same woofer in a ported and in a passive configuration and I prefer the latter. But I suppose it boils down to personal preference, room acoustics, and music preferences.
Please do not throw your cigarette butts on the floor. The cockroaches are getting cancer.
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