Designing a cabinet for Mark Audio Alpair 7.3 - Page 4 - diyAudio
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Old 23rd October 2012, 11:59 PM   #31
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that would be awfully tricky to try and turn...ill get drawing tomorrow and see what i can come up with.
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Old 24th October 2012, 12:05 AM   #32
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Quote:
Originally Posted by Studio Au View Post
that would be awfully tricky to try and turn...
It is not turned. It is assembled from flat panels.

And yes, it is a challenging build,

dave
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Old 24th October 2012, 12:28 AM   #33
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I have wanted to try my hand a coopering, if I make One similar it will be turned on a lathe for a round finish. Those ports are the only real dilemma I can see. Do you know if the Alpair performs well in a sealed box?
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Old 24th October 2012, 12:41 AM   #34
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For mid-tweeter use sealed or an aperiodic TL would be fine.

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Old 25th October 2012, 07:20 AM   #35
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This is how I think best to make my enclosures.

Layer up concentric teardrop 'rings' of plywood, and turn as a whole on a lathe. After route whole and recess for driver.

Like this concrete pen, but then rounded smooth.
Click the image to open in full size.
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Old 6th November 2012, 01:00 PM   #36
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Anyone have any recommendations for a woofer/sub to use in a FAST configuration.

Alpair 7.3 in a turned B&W like sealed enclosure. And the woofer in a big curbed cabinet.

A larger 8"/10"/12" woofer to handle the lower bass.

Any great drivers spring to mind, available to purchase in the UK.

Have my eye on the Peerless XLS 10 (70ea)
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Old 6th November 2012, 01:56 PM   #37
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I'm looking at the Peerless 835026. Models extremely well. Being aluminium, it will match the gray Alpair.

Bob
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Old 6th November 2012, 02:30 PM   #38
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hey nice work! I like where this is going. Ever thought about making an RP of the cabinet shape and taking a mould off it? Carbonology in the UK do a simple kit for this, then u cd produce a beautiful carbon fibre enclosure for the Alpair.

The peerless is available @ Falcon and Europe Audio I think - but what is the power handling on these? The travel doesnt look more than the Hivi M8N's.
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Old 6th November 2012, 02:41 PM   #39
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Here is the link to the eBay seller

2X Peerless XLS10 Subwoofer P830452 Loudspeaker Speaker | eBay

and the specs

Specifications

Nominal Impedance (Ohms)
Zd
4
Min Impedance
Zmin
5.2
DC Resistance (Ohms)
Re
3.6
Voice Coil Inductance (mH)
Le
0.99
Resonant Frequency (Hz)
Fs
22
Mechanical Q Factor
Qms
3.86
Electrical Q Factor
Qes
0.24
Total Q
Qts
0.23
Moving Mass (g)
Mms
136.6

Suspension Compliance (mm/N)
Cms
390um/M
Effective Cone Diameter (cm)
D
21.1
Effective Piston are (cm2)
Sd
349.7
Equivalent Volume (Ltrs)
Vas
66.90
Force Factor
Bl
16.75
Reference Voltage Sensitivity
dB
86.6
Weight of Magnet (kg)
2.42
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Old 7th November 2012, 10:16 AM   #40
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Here is a quick mockup.

Click the image to open in full size.
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