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Markaudio Alpair Hybrid
Markaudio Alpair Hybrid
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Old 7th July 2019, 09:46 AM   #11
Spassgeneral is offline Spassgeneral  Germany
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May be someone could verify my design with another program like akabak or ajhorn.
I can't see any flaws but I am not so experienced.
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Old 22nd July 2019, 10:27 AM   #12
Spassgeneral is offline Spassgeneral  Germany
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Not so many opinions.
But at least no bad ones.
So I bougt 21mm birch ply and started.
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Old 22nd July 2019, 10:33 AM   #13
Spassgeneral is offline Spassgeneral  Germany
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Ready for the first test run.
Still waiting for the felt to line the walls.
Some bracing is also missing.
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Old 22nd July 2019, 10:39 AM   #14
Spassgeneral is offline Spassgeneral  Germany
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Very promising results.
Definitively does not need baffle step correction.

Quick uncalibrated measure just to get an idea if everything is going into the right direction.
Taken at listening position at 3m distance
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Old 22nd July 2019, 12:24 PM   #15
Spassgeneral is offline Spassgeneral  Germany
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Without any correction solid down to 40hz.
I am curious to see the results when the side of the eclosure is glued and the box is properly sealed.
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Old 22nd July 2019, 03:10 PM   #16
chris661 is offline chris661  United Kingdom
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Any chance you can set for a log scale? Linear scale doesn't represent audio too well.

Chris
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Old 22nd July 2019, 04:48 PM   #17
Spassgeneral is offline Spassgeneral  Germany
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You are right chris.
But to see if there is something totall wrong it was sufficiant for me.
The log graph gives basically the same results.
Green line starting at 37hz.

The alpairs are wired in parallel.
Amplifier is a magnat tube rv2
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Last edited by Spassgeneral; 22nd July 2019 at 05:16 PM.
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Old 3rd August 2019, 06:50 PM   #18
Spassgeneral is offline Spassgeneral  Germany
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So,
during long listening sessios I adjusted the damping. As always., less is more.
Everything glued together.
I oiled the birch ply with linseed oil.
The oil is in dark walnut colour. Looks quite good.
With the dual binding posts I can run the drivers in parallel or in series.
Binding post panel is sealed with self adhesive foam.
Last thing missing is the removable clothed front grill.
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File Type: jpg _20190803_202939.JPG (611.9 KB, 71 views)
File Type: jpg DSC_0356.jpg (705.7 KB, 61 views)
File Type: jpg _20190803_202613.JPG (405.2 KB, 92 views)
File Type: jpg _20190803_204912.JPG (713.3 KB, 92 views)

Last edited by Spassgeneral; 3rd August 2019 at 07:10 PM.
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Old 3rd August 2019, 08:41 PM   #19
Spassgeneral is offline Spassgeneral  Germany
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It's not easy to show the finish on the fotos.
Looks much better in real.
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Old 3rd August 2019, 09:11 PM   #20
freddi is offline freddi  United States
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Markaudio Alpair Hybrid
your design looks like a super project - with decent bracing do you think 12mm Baltic birch plywood would sujffice ? Is the ~4K dip a result of the driver's center to center spacing? - or something elese ?

Last edited by freddi; 3rd August 2019 at 09:13 PM.
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