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Old 11th January 2012, 08:26 PM   #1
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Default DX55 OB - Micro Article

I saw that Mr. Full-Range ("Jon Ver Halen") is offering a steep discount
on the DX55 drivers, which reminded me that I wrote a micro article about
this driver use with the Eminence Beta 15" woofer in an open baffle as part
of BOB (the Big Open Baffle project). BOB is now the size of a book, so I
may as well celebrate the new year by trotting this out for Jon.

www.lowther-america.com

This is a really nice sounding system - a little better on the upper registers
than my usual 8 inch full range favorites, and not at all lacking as long as
you put deal with the size of an open baffle.

The crossover that worked well can be done with a First Watt B5, which is
documented at FIRST WATT or can be done DIY if you feel comfortable
coming up with some op amp or discrete buffers. A fine example is a
variation on the schematic circuit shown in the Slot Loaded Baffle article
on enjoythemusic.com.

The high pass filter is 12 dB/oct at 120 Hz, and the low pass filter is 12 dB
at 80 Hz. Both drivers are wired in phase. A 6 dB bump at 20 Hz is provided
by a high-Q low cut filter, and the top end is shelved down 4 dB above
20 KHz.

The DX55 is mounted at 36" high in the center of a 30" X 60" open baffle,
and the woofer is mounted below that. The open baffle is supported by
wings on the side rears, 12" to 16" deep and about 30 " high.

Attached are two graphics, one showing the near field crossover response
of the drivers separately and together, and another showing the response
full range taken at 1 meter on axis.

And there you have it.

Attached Images
File Type: gif DX55XVR.gif (6.1 KB, 846 views)
File Type: gif DX551M.gif (5.8 KB, 824 views)
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Old 11th January 2012, 09:17 PM   #2
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by Nelson Pass View Post
I saw that Mr. Full-Range ("Jon Ver Halen") is offering a steep discount
on the DX55 drivers
Mr. Pass,
where? Very interested but cannot find the location of the offer
Cheers,
Nic
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Old 11th January 2012, 09:28 PM   #3
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Location: North Texas, USA
Click the Lowther-America link.

Quote:
Originally Posted by NicMac View Post
Mr. Pass,
where? Very interested but cannot find the location of the offer
Cheers,
Nic
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Old 12th January 2012, 08:15 PM   #4
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Appendix 1

Here's that crossover.

Attached Images
File Type: gif dx55 xvr.gif (94.2 KB, 835 views)
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Old 12th January 2012, 08:25 PM   #5
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Appendix 2

Here's a diagram of the baffle.
Attached Images
File Type: gif dx55 ob.gif (63.0 KB, 705 views)
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Old 13th January 2012, 10:55 PM   #6
kmaier is offline kmaier  United States
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Quite interesting. I picked up a pair of DX65 drivers 2+ years ago from Jon in 15 ohm impedance. Perhaps this is a nice way to try them out. I also picked up a pair of AE-15 drivers from him... maybe they will work in this interesting little design of yours. Might have to cut some wood....

Regards, KM
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Old 14th January 2012, 05:44 PM   #7
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The AE's will work perfectly IMHO.

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Old 16th January 2012, 11:46 PM   #8
kmaier is offline kmaier  United States
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Thanks.... sounds like a plan then. Currently I own nothing but tube amps. We'll see how the AE does with those.

Regards, KM
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Old 17th January 2012, 04:33 PM   #9
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Depends on the tube amps. I have heard a wide range of performances
with different tube amplifiers, and some that had excellent bass.

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Old 22nd January 2012, 11:39 PM   #10
mr ed is offline mr ed  United States
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Location: austin tx
I had been slowly working on a DX55 based OB for about a year and a half.
I had just finished a 6SN7 based active XO and was about to start back on bass driver integration. I had a couple aplha 15 un opened in the garage, when fires in our area took my house in Septemer.
I have been thinknig of trying the PM6A and a Tone Tubby next , but now you may be making me re-think and go back to the DX55. I was not sure I could get it to play low enough to blend propperly.

Cheers
Ed
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