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Multi-Way Conventional loudspeakers with crossovers

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Old 12th December 2013, 05:32 PM   #1011
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Yes... the trap, high pass cap, low end roll off induced by both the Vifa driver's native low end frequency response & open baffle roll off effects plus the pad all work together to shape the response of the Vifa. Simple.... but not so simple as is usually the case with a multi-way speaker. And you also have to consider the rear radiation frequency shaping (Roll off) of the Vifa magnet structure, basket and pole piece vent. The front and rear radiation are very different from the Vifa unlike the woofer where there is not much difference.
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Old 12th December 2013, 05:57 PM   #1012
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Sorry, I should have been more clear. When I said "compensate with a smaller inductor", I meant the woofer inductor. For example a 6.8uF cap on the Vifa and a 22uH coil on the Peerless. Or 5.6uF Vifa + 18uH Peerless.
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Old 12th December 2013, 06:55 PM   #1013
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U.L. Varying the inductor between 18 & 22 UF has minimal effects on the upper roll off of the woofer assuming the inductors are all 15 ga iron core.

The real work is with the Vifa high pass cap, pad and trap shunt resistor. All I can recommend is to start with 5.0 UF and add inexpensive 0.33 UF or similar in parallel with the 5.0 up to about 6.5 UF and see how that works.

However, if you go below 5.0 or higher than 6.5 UF will likely need to adjust your pad. Could be 1/2 ohm or 1 ohm to retain the proper cross over frequency.
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Old 12th December 2013, 09:49 PM   #1014
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Got it. I will get a bunch of resistors and a few small caps for tweaking.
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Old 13th December 2013, 03:13 AM   #1015
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That's best. Your room, and even your ears, will necessitate some adjustments.
Even when John and I build the same speaker, we often end up with with slightly different crossover values.

Different rooms, different ears.
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Old 15th December 2013, 11:19 AM   #1016
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Hi

I have a question a little bit out of the scope here.

You have developed the Manzanitas with a square front baffle.

Are the any pros or cons against making the front baffle in a trapez shape?

I am not so much talking about the Manzanitas, but open baffle in general.

best regards

uwe

Last edited by heinz1964; 15th December 2013 at 11:43 AM.
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Old 15th December 2013, 08:21 PM   #1017
Pano is offline Pano  United States
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The cons would be it's harder to build. The pros would be fewer parallel edges. By offsetting the drivers, you can minimize the effects of parallel edges a bit.
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Old 18th December 2013, 01:41 AM   #1018
nater01 is offline nater01  United States
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I am ready to build my first open baffle project, and based on what I have searched out, the Manzanita / Manzanita Ultra is a great place to start. I have read a majority of this thread, as well as the other threads I found via google, however I still have a few questions I was hoping someone could help me with.

- The crossover / design for the dual woofer version of the Ultra was never released? Has anyone tried to build one?

- As space and $$ are not huge concerns at these levels, the Ultra is the way to go vs the original 12" woofer design?

Thank you for your help!
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Old 18th December 2013, 12:47 PM   #1019
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Default "europeen crossover"

Ja- ccap-620 Jantzen Cross Cap MKP capacitor 6.2 uF / 400V
M- BL100-200 Mundorf Baked Varnish Luftspule BL100, 2.0 mH/0.74
M- bs140-220 Mundorf bs140 core coil 22mH/0.56Ohm
M- res20-047 MResist Supreme 4.7 Ohm / 20 Watt
M- res20-082 MResist Supreme 8.2 Ohm / 20 Watt

i can not judgen these elements are they correct?

Yours Bart
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Old 19th December 2013, 09:19 PM   #1020
Marinos is offline Marinos  Greece
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Quote:
Originally Posted by Pano View Post
The Peerless woofer has a sort of tapered flange. I just used that on the front of the baffle. It's made to be that way.
Pano, units have arrived and I can see what you mean about Peerless. Thanks for the information

About Vifa. Is it critical to flash mount it ? It is not that easy to route it's shape.. Also, there is a flange in front of the chassis. Perhaps for positioning the unit at the back of it's supporting surface. What did you do with that ?
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