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Multi-Way Conventional loudspeakers with crossovers

Fast, fun, Inexpensive OB project
Fast, fun, Inexpensive OB project
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Old 2nd January 2018, 11:36 PM   #1641
615498 is offline 615498  Canada
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Fast, fun, Inexpensive OB project
Quote:
Originally Posted by John Busch View Post
Hello Pieter...

Thank you for your interest in the Manzanita and Ultra! There is a lot of flexibility in construction materials as long as all joints are secure and rattle - buzz free.

.75" is all that is needed for either speaker. Too much thickness can be an issue, especially with the Vifa. The amount of depth behind the Vifa can restrict and reflect the rear output radiation. Not good. I think your best approach to the wood you use will be driven by your cosmetic priorities. For example, for something simple with a painted or glue on veneer surfaces, 3/4" MDF works fine. If you want more of furniture appearance you could use any solid wood, or layers of same to get to the .75" thickness.

The nice thing about the 15" is that it has enough surface area that medium 2-5 MM excursions are sufficient for most bass requirements and that amount of movement is easily handled with .75" baffle thickness.

Please let us know how your project evolves and good luck!

Best
Nice to see the thread is still alive. The pics show (I hope) baffles made from 2' x4' 2" MDF, which I stumbled into at the local building supply store. They required some router work to open the backside, but am happy with the result.

It took about six months for the big drivers to loosen up and methinks its time to tweak the crossover a bit. Wonderful design John.
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Old 3rd January 2018, 01:16 AM   #1642
John Busch is offline John Busch  United States
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Thanks for sharing your build experience. And it is good to know you are happy with the speaker. The Manzanita design is a bit of a low cost, simple sleeper that can be quite surprising. Happy New Year! John
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Old 3rd January 2018, 04:09 PM   #1643
drpro is offline drpro  United States
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Fast, fun, Inexpensive OB project
Interested in this build. Does anybody have a US source for 20mh iron core inductors?

Also I have a pair of Hawthorne Audio 15" Augies I purchased before the supply ran out. No nothing about whether or not they would work in place of the GRS 15" described here.

Tnx
David
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Old 3rd January 2018, 04:11 PM   #1644
drpro is offline drpro  United States
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Trying for 14ga on the 20mh
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Old 3rd January 2018, 04:18 PM   #1645
Skip Pack is offline Skip Pack  United States
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Quote:
Originally Posted by drpro View Post
Interested in this build. Does anybody have a US source for 20mh iron core inductors?
Tnx
David
One answer:

SuperQ Steel Core Coils | ERSE

I use them and like them very much.

Skip
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Old 3rd January 2018, 10:01 PM   #1646
CGodecke is offline CGodecke  United States
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I'm just starting a 15" woofer version of the standmounter, and have a question on the dimension of the side wings. What about using 5.5" x .75" boards, the actual dimension of 1 x 6) rather than rip them down to 4.25"? Aligning the front edge of the trim with the front of the baffle, there would be about 4.8" extending behind.

Everything else is pretty straighforward, other than recessing a squircle-shaped driver! Learning curve time.

Thanks,
Cam
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Old 3rd January 2018, 10:11 PM   #1647
Pano is offline Pano  United States
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You can get the inductors from Erse, Parts Express and Madisound.

I've seen and heard the Augies a few times, but don't know the specs. I'm sure they can be used, but the crossover would need tuning. John has worked with Hawthorn some and should know.
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Old 11th January 2018, 02:32 PM   #1648
CGodecke is offline CGodecke  United States
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OK, maybe the issue of side wing width has been addressed often enough? I feel as though I've killed the entire thread! I'll stick with John's statement that the wings extend no more than 4" from the rear of the baffle (for standmount Manzies.)

Finally got a reasonably good dry run of TC9 baffle recess, after getting the right combo of router bit and template guide diameter, along with guide depth for a 1/4" thick template. Definitely not straightforward to do at home, rather than have it CNCed somewhere

Cam.
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Old 11th January 2018, 04:11 PM   #1649
Pano is offline Pano  United States
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Sorry for no answer on the wings. If you want to do a tapered wing on one side and straight on the other you can go a little deeper. That's how I built mine.
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Old 11th January 2018, 07:40 PM   #1650
John Busch is offline John Busch  United States
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The wing depths for both the original Manzanita and Ultra were set at 4" for 2 reasons, simplicity of construction and once you get above a 4" depth behind the Vifa you can start to hear cavity resonances. And you start transitioning from a simple dipole to a more complex cardioid response.

The simple 4" wing(s) helped to keep the crossover fairly simple to. It is a compromise to be sure, but again, needed to meet system construction simplicity goals.

With that said, more complex wing shapes and depths can be employed. I have just finished an updated GRS 15 based Manzanita that uses an updated, but more difficult to fabricate wing set. The complex wing requires some adjustment to the crossover but yields a higher efficiency system with a bit more extension on the lower bass. Hope to post more on that in the near future.
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