Alpair 12 - Damped Air Coupler box design - Page 7 - diyAudio
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Old 27th March 2010, 07:11 AM   #61
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I've been living with the A12 on beater OBs for the last 2 weeks. These are a significant advance on any other MA driver i've heard (all but the A7, CHP-70, and new CHR).

I have to hold myself back from treating them until we can get them in their miniOnken... I have a 1st draft, but it needs another revision for the tricky ports. Net internal volume of 13 litres.

dave
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Old 27th March 2010, 08:31 AM   #62
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Quote:
Originally Posted by Douglas Ingram View Post
I have become convinced that these Alpair 12's are the driver's that I will be using for an upcoming project. Some readers here may be aware that I am planning a Clairtone Project G "recreation". It uses 18" diameter globe speakers mounted on either side.
I am looking to figure out an enclosure for these drivers. I'll probably have to make a few boxes/globes to get it right, and I'll probably make a set of Pencil 12s to use for reference. Those walnut boxes look nice, I might build those!
I'd greatly appreciate any advice. Dave from Planet 10 has already made some suggestions, and it is upon his advice that i consider Alpair drivers.
Hi Douglas,
Glad you'd like to try the Alp12's. The Pencil 12 Walnut cabinets have been with their new owner for a week. John, who's a pianist is very happy with the results.

If you're going to use hard wood like +20-mm thick solid Walnut, I suggest the following:

1 - Build the boxes with removable rear panels (see previous posts)
2 - Don't add bracing at the beginning, experiment first with 0.2Kg to 0.35Kg of soft damping material.
3 - Gradually add bracing starting in the middle of the cabinet approx. 120 to 150-mm below the driver running from side panel to side panel. We found the Japanese Walnut so dense that we use no bracing in these cabinets.
4 - Use at least 25-mm (1") low density damping felt immediately behind, either side and above the driver.
5 - Place the terminals behind the driver. This position we find more practical (keeps more cable outside the cab).

The Japanese White Birch Pencils have just arrived. I should have time next week.

Cheers

Mark.
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Old 27th March 2010, 04:14 PM   #63
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Thanks for the responses Mark & Dave!

Dave, I will await patiently the development of the MiniOnken box for the Alpair 12. I think that when you get it "right" that it will prove to be a good basis for my globe version. I don't want to nag you, but please do keep me in mind for when that day arrives.

Mark, thanks for the feedback. I just discovered this thread last night and saved the info for building the Pencil 12s, and I'll add any developing information, too. These drivers are very interesting to me.

I remain open to any recommendations that anyone with more experience designing speaker enclosures may offer as I work towards my goal. Fortunately (or not!) this is a long term project and I have time. Patience, on my part, is very much required!
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Old 10th April 2010, 07:15 PM   #64
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Hello,

is there any crossover needed for the pencil or is it just the alpair12?

Whats with the 12,5l bassreflex recommend sometimes?

What do you prefer/recommend?

thank you

Rico
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Old 10th April 2010, 09:43 PM   #65
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A crossover is an electrical circuit (passive or active) that is employed to cross over one driver to another, viz. roll one off above or below a specific frequency. So unless you were planning on using the Alpair 12 with another driver, no crossover will be present.
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Old 29th April 2010, 04:31 PM   #66
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This is Japanese white birch wood cabinets for Pencil 12 at Mark's office. The quality is extremely good.

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Old 29th April 2010, 04:34 PM   #67
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The natural texture of white birch wood is beautiful.

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Old 29th April 2010, 04:36 PM   #68
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Mark and his full range speakers.

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Old 29th April 2010, 06:07 PM   #69
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Nice... furniture quality.
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Old 29th April 2010, 07:28 PM   #70
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Finally here are the picture of the finished boxes in ral3001!
Now start the set-up!
Attached Images
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