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Crazy Dipole Linkwitz Ultimax 18 setup

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So I've been lusting after a Parts express UM18-22 18" with sealed flat pack.  They were out of stock when I looked but I found a CraigsList add for two ultimax's in a crazy looking Dipole box.

 

 

927838660_dipole3.thumb.jpg.7ab48d895d9feeeb7eb69cc362caf36d.jpg

1900042455_Dipoleone.thumb.jpg.61dbd74e837774b9d2f621ac2f4638df.jpg

700877054_Dipole2.thumb.jpg.bc88781c94a6b287ade91f640b390a9e.jpg

Very close to this build here https://www.linkwitzlab.com/woofer.htm

 

I've been telling people that the bass is directional and no one wants to believe me.

So I finally measure both on-axis and 45 degrees off-axis

845770792_OnAxisNearfieldUltimaxDipole.thumb.jpg.e89bcf59f3819b7a92761de9f1797207.jpg1181970801_45degreesoffaxis.thumb.jpg.383a3c6c84b864c844e83cc2815b8dc6.jpg

 

The build is incredibly inefficiant as I'm currently bridging a crown K1 at 1100wats 8ohm and have to boost sub output from the Denon receiver quite a bit.  Not so much nearfield but anywhere else I put in the house.

I have a sealed flat packs on the way so I can separate these beasts and pressurize the room better but the fact that I can rattle my brain while watching a movie and have my wife, literally next to me on the couch and she doesn't have to endure the bass that I love is kind of magical.  Not sure I want to take this thing apart now.

 

Just thought I would share. 

 

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When I click the image links:

 

Quote
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So the measurements were on axis and off axis in open air / outside with no boundaries? Or the measurements were on axis and off axis in a room / house / space with boundaries? 

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48 minutes ago, klipsch said:

So the measurements were on axis and off axis in open air / outside with no boundaries? Or the measurements were on axis and off axis in a room / house / space with boundaries? 

Indoors with boundaries. Forgot to add the on Axis (in Room) response.  12 inch away so don't know how much room was a factor.601666481_DaytononAxis.thumb.jpg.4aed08e381a9331a7d220370eadf3028.jpg

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Ripole is the term I learned for this set up.  Ripole brought me to databass.  Was looking for 18 inch drivers that would give the best result for my tastes in hi fi.  Pandemic killed all the new ideas this website gave me for anything outside of hi fi.  The drivers I collected are stored face down and acting as furniture a few feet away from me waiting on 1 more.  

You found a pot of gold.  Enjoy it like it is or upgrade the drivers.  Build another 1 or 3 and be done for life.  

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That's a fascinating contraption.  The bass appears to be directional down to very low frequencies.  I wonder what happens below 10 Hz?  One source says that the Ripole configuration has its effective resonance below the driver Fs, with the given example being lower by a factor of roughly 1/sqrt(2).  The Ultimax specs indicate an Fs of 19.5 Hz, suggesting a Ripole resonance at 13.78 Hz, but the measurements don't show any drop below there.  Hmm.

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