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Markaudio Alpair Hybrid
Markaudio Alpair Hybrid
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Old 3rd August 2019, 11:27 PM   #21
Spassgeneral is offline Spassgeneral  Germany
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I think 12mm is not enough.
I used 21mm with bracing.
18mm could be fine.
The 4k dip. I really don.'t know.
The measurement is in living room at listening position..
Could also be room influence.
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Old 4th August 2019, 09:24 AM   #22
xrk971 is offline xrk971  United States
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Markaudio Alpair Hybrid
Nice work! The measurement look very good and you are getting quite the bass extension. Must sound very nice.

The 4kHz dip is probably not a big deal as dips that are narrow are not noticeable - vs peaks which are. 4kHz corresponds to a 1/4 wave reflection from a feature that is 2.1cm from the driver cone. Perhaps it is the slight raised edge on the sides next to the drivers. Or it may be the width of the driver bezel as it is not rebated and flush. I like boiled linseed oil very much. Makes a great finish with a deep lustre. I sand with very fine grit paper when oil is wet. The small particles embed themselves into the grain crevices. Then when the oil cures, it makes a smooth surface with voids filled in. It can become smooth and mirror like even though wood started out full of grain.

I also did my Karlsonators with BLO, if you look at the reflection from the top panel you can see what I mean.

Click the image to open in full size.

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Last edited by xrk971; 4th August 2019 at 09:29 AM.
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Old 4th August 2019, 10:31 AM   #23
Nenola is offline Nenola  Finland
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Hmm, now this is really interesting build! I also want to build something with dual 10.3's (I actually have 12 of them )

I've been looking at the Compact Mass Loaded Quarter-wave plans (is it basic bass reflex?) for it, but this hybrid caught my attention. They are pretty much the same size, and thats good.

But now I cannot decide which way to go? Of course the basic box is easier to build, but then again this hybrid design only has the back panel "tilted" inwards, kind of.

How about the sound? What are the benefits and drawbacks for these designs? At least the MLQW is suggested to use as a 1.5-way, but how about this hybrid? Use both as a full-range, or would it be better to use as a 1.5-way?
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Old 4th August 2019, 10:58 AM   #24
Spassgeneral is offline Spassgeneral  Germany
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I already build a pair of tqwp with the 10.2
They sounded really great. They played down below 30hz. But not with ease but rather strained.
Hard to describe in english.
This hybrid design plays everything with ease.
Doesn't matter how loud. They can play very loud and undistorted.
In my high fidelity life I owned about 20 different speakers. Infinity kappa90 renaissance, quadral vulkan mk 5, t+a tb140, magnepan mg1.6, martin logans, apogee, adam audio, kef, tannoy. Just to name a few of them. These alpair hybrid design is definitely in the top leage.

Last edited by Spassgeneral; 4th August 2019 at 11:07 AM.
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Old 4th August 2019, 11:07 AM   #25
Spassgeneral is offline Spassgeneral  Germany
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The alpairs are not flush mount. They will be when I have the panel with the cloth fixed. This is 10mm with proper cut outs. Have to wait for the cloth to come.

I also thougt about doing 1.5 way.
I decided to hear the 1 way without any electronic part in the signal path first.
As there is no bafflestep compensation needed I decided to go without. So the drivers directly wired to the amp.
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Old 4th August 2019, 11:16 AM   #26
Spassgeneral is offline Spassgeneral  Germany
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Felt on the top, back and one side of the box. Just below the lower driver. Holey brace also with one layer of 5mm (not aplied in the picture yet)

The final result, uncalibrated at listening position.
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Old 7th August 2019, 08:55 PM   #27
Spassgeneral is offline Spassgeneral  Germany
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Panels for the grills are prepared.
Only the cloth has to be attached.
Almost finished now
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Old 10th August 2019, 10:12 AM   #28
Spassgeneral is offline Spassgeneral  Germany
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Setup completed.
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Old 13th August 2019, 08:28 AM   #29
Spassgeneral is offline Spassgeneral  Germany
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Covering the front panels with cloth was easy doing.

First I attached a 10mm strip of double sided tape at the edges of the inner side of the panels. The corners were left out.
You can cover the panels with the cloth which will stick to the tape very well. It sticks just in a way that you can adjust the correct fit and tension easily. Then finally fixed the cloth with a staple gun. After that stretched the cloth around the corners an fixed with staples.
Perfect fit.
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