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Old 22nd June 2010, 08:23 AM   #1
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Default Alpair 7 - Twin driver studio monitor plan

Hi Fellas,
We have Scott to thank for this twin-Alpair 7 studio monitor plan design. I quite like these duel driver arrangements having attained success with earlier double CHR-70 BR boxes. Power handling is generally comparable or even superior to most similar sized 2 way stand mount systems. This plan should be suitable for larger spaces (within reason)

Suitable amplification is likely to be 12 watts Class A, 50 watts Class A/B up wards. I'd suggest wiring the Alps in series to make 8 Ohms. This plan wont suit flee or candle powered amps.

Please don't punish this design by adding a tweeter! The Alp7's are going to 30-kHz so there's more than enough HF response to please. Even your pet mutts will be satisfied.

I'd suggest 15-mm to 20-mm thick ply, solid woods or the newer Bamboo's for this build. The plan shows Imperial dimensions. For those like me who use System International (metric), get your calculators out. Feel free to post a metric version of this plan (keeping the ©Markaudio IP notice - thanks)

Any commercial interests wishing to use this design, note the ©markaudio IP rights. This plan is NOT available for free commercial use. If you're a commercial maker interested in this design, please contact me via this forum or by email.

Thanks again to Scott for providing the brain-work.

Cheers

Mark.
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Last edited by markaudio; 22nd June 2010 at 08:47 AM. Reason: additional info
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Old 22nd June 2010, 11:17 PM   #2
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looks very familiar, lol

Click the image to open in full size.

from a jbl article off their website (I forgot which one)

"As you double the drivers, at the same volume level excursion is halved, and distortion drops to a quarter."

Norman
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Old 22nd June 2010, 11:20 PM   #3
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Quote:
Originally Posted by norman bates View Post
looks very familiar, lol

Click the image to open in full size.

from a jbl article off their website (I forgot which one)

"As you double the drivers, at the same volume level excursion is halved, and distortion drops to a quarter."

Norman
Norman...any chance you can make the pic....EVEN SMALLER!!!!

LOL
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Old 23rd June 2010, 03:56 AM   #4
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lol, yea, in photobucket the lists under the pics wern't there, I clicked "share" then saw thumbnails. Funny thing is when I previewed it, it worked fine. Oh well. Yea, i get upset when I click on a pic and it is smaller than the previous screen.

aptquark, love the avatar, you can buy early's hats online.

Norman
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Old 23rd June 2010, 09:34 AM   #5
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Quote:
Originally Posted by norman bates View Post
lol, yea, in photobucket the lists under the pics wern't there, I clicked "share" then saw thumbnails. Funny thing is when I previewed it, it worked fine. Oh well. Yea, i get upset when I click on a pic and it is smaller than the previous screen.

aptquark, love the avatar, you can buy early's hats online.

Norman
Early's hats are for sale???

Now I just need to get the wife to approve them for wearing. "Booty Hunter" maybe a little difficult though.

Thanks
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Old 23rd June 2010, 10:18 AM   #6
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Squidbillies Hats and Squidbillies Trucker Hats

Norman
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Old 23rd June 2010, 11:39 AM   #7
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Thanks Norman..."Truck Boat Truck" is my favorite.

Now we best stop or Mark will be pissed.

Cheers.
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Old 24th June 2010, 06:48 PM   #8
tpsorin is offline tpsorin  Romania
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Is this a 1.5 design? Or the two drivers will work in parallel for all frequency range?
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Old 25th June 2010, 06:16 PM   #9
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No, it's 1 way. The drivers are series wired as noted on the plan (you can parallel them if you think your amp can handle a ~1.8ohm nominal impedance load of course. )
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Old 26th June 2010, 03:52 PM   #10
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Hi Mark,

Nice cabinets. I have questions:
1. What is the size of the gap between the two braces? 25.5mm?
2. How about the postion of the two holes for Alpair 7 drivers?

Thanks,
Tony.
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