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Why not cardioid midrange?
Why not cardioid midrange?
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Old 13th August 2019, 12:44 PM   #31
Pano is online now Pano  United States
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Why not cardioid midrange?
I remember Gary Pimm's cardioid midrange that was a deep open back box with careful stuffing. At first Gary used two Eminence Beta 8 stacked vertically. Later he dropped down to one per side. Certainly some of the best midrange I've ever heard.
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Old 13th August 2019, 08:14 PM   #32
ScottG is offline ScottG  United States
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-only a cardioid response on the low-end of the midrange.

It's basically an open-back design 1st, an aperiodic design 2nd, and a cardioid pattern 3rd.

Different priority and different result.

It might however be useful in the context of resonance from the "front" wall (..the wall behind the loudspeaker), depending on the distance from the front wall.
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Old 14th August 2019, 01:27 PM   #33
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Why not cardioid midrange?
Yes, probably not cardioid across its full bandwidth which was 200-5000 Hz IIRC.
Which raises the question - how do you make a cardioid midrange speaker? I know how cardioid, super cardioid and hyper cardioid microphones are made. But speakers?
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Old 14th August 2019, 03:26 PM   #34
bwaslo is offline bwaslo  United States
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Why not cardioid midrange?
simultaneous playing of a dipole driver and a sealed box driver?
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Old 14th August 2019, 04:03 PM   #35
Juhazi is offline Juhazi  Finland
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Yes, I guess too that combination of dipole and monopole would give widest cardioid range, if distance between sources is minimal.

Any cardioid "unit" has certain response curve and cardioid pattern is lost at some high frequency. It is quite a lot like a dipole, there must happen nulling of front- and backside wavefronts, this time on the backside.

We have several special threads here already, they have been linked already.
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Old 14th August 2019, 07:27 PM   #36
ScottG is offline ScottG  United States
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Quote:
Originally Posted by Pano View Post
Which raises the question - how do you make a cardioid midrange speaker? I know how cardioid, super cardioid and hyper cardioid microphones are made. But speakers?

Quote:
Originally Posted by ScottG View Post
A real *midrange cardioid response (the ripple on the low-end is a measurement artifact of the way it was supported):

Adventures in cardioid


*from a driver that isn't a midrange. (..and disregard the polar above 1.5 kHz.)
Quote:
Originally Posted by ScottG View Post
Here:

Seeking new build advice - please offer your .02

*Note: you don't have to do a resistance design, you could do an "active-delayed" design to (more or less) circumvent the problem with a resistance design in the midrange.

Active-delayed designs are where you have a secondary driver on the rear of the loudspeaker that's out-of-phase and where the front driver is delayed so that it's near in time with the rear driver; no leaky side ports needed. You can even go Hyper-Cardiod with this. Baffle effects are still a problem though - so upper freq.s always have some sort of limit to how closely (or not) they approach a real cardioid response.
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