Fast, fun, Inexpensive OB project

[Pano]

Thanks John. That helps explain your choices and design goals. It tells us what to adjust with different baffles.

 

[classicalfan]

Pano, John,

Thank you both for the clarifications. You've confirmed what I have been planning to do all along. That is to build a combination stand/wings to raise the baffle up to listening height.

Here is a SketchUp drawing of the design. The only difference between the two views is an extension of the base forward in one version to increase stability. I don't think that will make any acoustic difference.

Login - Dropbox

(P.S. I'm not sure how to imbed an image into the post so here is a Dropbox link instead. Let me know if it doesn't work and I'll try something else.)

 

[Pano]

That link isn't valid. Can you export from Sketchup and attach the image here? Or zip and attach the Sketchup file?

 

[classicalfan]

I'm not sure how to do that. Can I just copy the png image file itself into the post, or do I have to link to a URL somewhere that is holding the file?

 

[Pano]

Save the image to your computer, then use the attach dialog here to upload and attach it.
How to attach images to your posts.

 

[classicalfan]

Here is the SketchUp picture. I finally figured out how to do it and it was a lot easier than I thought. Thanks for the hint.



The overall dimensions are 15"w x 42"h, which puts the center of the Vifa at 36" above the floor.

 

[Johno]

Classicalfan, this is how I built mine...

 

[classicalfan]

Pretty much the same idea.

I'm thinking of using a large piece for the base, probably 1.5" thick, in order to add more weight at the bottom. Might not be necessary, but don't see any downside.

 

[Pano]

Thanks for the pix, both of you. That will work great.

 

[classicalfan]

So just to be sure about some of the things that have been discussed.

These configurations with the open area below the baffle will work fine with the crossover that was been presented back in Post #1601. The only component that might need adjusting is the attenuation resistor R1 to better match the room.

Does that sound about right?

 

[Pano]

Yes, that's right. That crossover will work. Most people find that they need to adjust the resistor for their room and ears.

 

[classicalfan]

Thanks Pano for this and all the other comments regarding the Manzanita. I'm looking forward to building it. Just need to find the time.

 

[heinz1964]

Hi

I would like to try to make a Manzanita
with what I have lying around.

I have two 12" Wavecor and 3" Scan Speak fullrange.

I also have most of the parts for the
crossover.

All I AM missing is the big coil
20 mH are Hard to get but I can
get either 18 or 22 mH.

Wich would be the Best?

Best regards

Uwe

 

[Pano]

Probably the 22mH, but not knowing the woofer, it's hard to say. Do you have info on the woofer?

 

[heinz1964]

Hi Pano

It is the Wavecor SW310WA01 :

Qt 0.59
Fs 28.5 Hz
Sensivity 87 dB

 

[Pano]

Thanks. It's not too far off the Peerless 830669 of the original design. Less efficient but a lower FS. I suppose it will play a little lower, but not as loud. Either 18 or 22mH will work, but I'm not sure which would be better. The idea with the big coil is to flatten the response of the woofer on a the open baffle.

It's worth running a simulation in something like Basta! to compare them. Or wait until John chimes in. I think that he has used 22mH in some of his designs.

 

[bobo le chat]

OK, time to take a survey of the many who watch this thread... Have a larger cost effective Manzanita inspired speaker with the following advantages and disadvantages:

Advantages:

Similar design goals of simplicity brought forward from from the original Manzanita. Bang for buck, easy to build with simple tools and use of common off the shelf materials and components.
4 db of added net efficiency. Solid 8 ohm easy to drive load.
Bass extension to 32 Hz.
Improved over all performance over the entire usable frequency range. (32-18.5K)
Off the shelf name brand drivers available nearly everywhere in the world.
Simple wood working skills to fabricate.
Simple fabrication and construction with basic wood working tools.
Higher power handling and way more acoustic output.

Disadvantages:

Larger system in terms of dimensions & weight.
Higher material costs... estimated at $280 - $300 each.
Floor standing configuration that requires a bit more floor space. Kind of an Ultra but with major upgrades.

Baffle dimensions are around 19" wide, 12" deep and 40" high. About 45 pounds net. Two way using an 18" and 4.5" (world class Neo).

10 element crossover.

Look forward to hearing back from all who care to reply. J

Hello John
What news ?
Best regards
Roger

 

[John Busch]

Update from Mr. Slow Man.....

Good morning all... Must apologize for the lack of progress on this project... Health and time issues have really slowed things down. (Ironically hearing - balance issues!) Covid hasn't helped either. (now over 70 and have to be careful) Have all the components and built a mock up - test baffle. Prototype crossover built. Some listening - auditioning and crossover tweaking. Next I need to modify a pair of finished Ultra floor standing baffles I have in storage and put it all together. Want to have a completed project for pictures. The original Manzanita took a year or so of off and on progress to get something worth sharing. J

 

[bobo le chat]

Covid hasn't helped either. (now over 70 and have to be careful) J

I understand perfectly, it is also my case

Take all your time

Good regards
Roger

 

[heinz1964]

Hi Pano

According to the datasheet of the Peerless the sensitivity is measured in halfspace. So I think maybe the two speakers have the same sensitivity after all?

best regards
Uwe