Alpair 10P 'hybrid' build - diyAudio
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Old 23rd July 2014, 04:46 PM   #1
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Default Alpair 10P 'hybrid' build

IMG852.jpg

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Finally started this build yesterday; all wood cut and ready to trim, do the driver cut outs and assemble cabs tomorrow

H88 x D27 x W18.5 (cm) with a 7 degree lean

The cabs are an experimental folded line type with a rear exit. Internal line length is approx 155 cm, lined with Bawotumex
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Old 23rd July 2014, 07:00 PM   #2
zman01 is offline zman01  Bangladesh
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Interesting project - keep us posted.

Any design goals in terms of F3 or F10 you can share?
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Old 23rd July 2014, 08:07 PM   #3
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An f3 in the 40's would make me happy, altho the line is slightly under optimum length perhaps

I guess the goals are adding more bass impact, keeping the response reasonably flat and preserving the good sensitivity of the driver
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Old 24th July 2014, 06:19 AM   #4
zman01 is offline zman01  Bangladesh
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I guess the goals are adding more bass impact, keeping the response reasonably flat and preserving the good sensitivity of the driver
The first point - more škickš in the bass if I understand correctly? Not a bad goal to have, especially since it is a relative weak spot for many wide-band designs.
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Old 24th July 2014, 07:58 AM   #5
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Most Alpair drivers have a natural rise to compensate for baffle step, the 10P less so. But off-axis seems to level off the lower treble and the response above 10khz still looks ok.

Hopefully the cabinet design works ok too
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Old 24th July 2014, 07:33 PM   #6
Bare is offline Bare  Canada
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Interesting build.. I'm considering this driver for a project as well.
What is the actual Cone diameter.. If you might?.
Asking because I've noticed that Mark Audio has an annoying habit of giving the inner edge of the Mount ring as Nominal diameter. Never the actual piston /cone dimension.
Piston cone /area is a significant spec.. in my observations
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Old 24th July 2014, 07:39 PM   #7
chrisb is offline chrisb  Canada
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Are these published specs insufficient?


T/S Anechoic: 2.2/30g spider final version: 10P Gen.1
Revc= 6.200 Ohm
Fo= 42.398 Hz
Sd= 88.250 cm
Vas= 29.995 Ltr
Cms= 2.712m M/N
Mmd= 4.719 g
Mms= 5.196 g
BL= 4.741 TM
Qms= 2.425
Qes= 0.382
Qts= 0.330
Levc= 50.196u H
No= 0.579 %
SPLo= 89.645 dB
Xmax = 7mm (1 way) limited by Arrestor
Power = 30 watts Nom.
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Old 24th July 2014, 07:58 PM   #8
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....I've noticed that Mark Audio has an annoying habit of giving the inner edge of the Mount ring as Nominal diameter. Never the actual piston /cone
Madisound has the annoying habit of assigning MA drivers to a size class based on frame size. Mark names his drivers by the cone diameter. The cone of the A10P is 10cm in diameter. Of course, the Sd is on the spec sheet, and that is the number you really want.

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Old 24th July 2014, 08:04 PM   #9
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Quote:
Originally Posted by Bare View Post
Asking because I've noticed that Mark Audio has an annoying habit of giving the inner edge of the Mount ring as Nominal diameter. Never the actual piston /cone dimension.
The number in the name is very close to the actual cone diameter, in cm for the Alpairs, in mm for the lower end line.

dave

Edit: Bob beat me.
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Old 24th July 2014, 09:26 PM   #10
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Originally Posted by Bob Brines View Post
The cone of the A10P is 10cm in diameter.
98.7 mm for A10.2 and 97.4mm for A10p to be more exact (no A10.3 easily to hand)

dave
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