Alpair 10 Gen. 2 introduction - diyAudio
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Old 11th November 2010, 07:38 AM   #1
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Default Alpair 10 Gen. 2 introduction

Hi Guys,
Here it is, the new Alpair 10 Gen. 2. Its a whole new ball game with this driver. Apart from some parts of the frame, this a all-new design and build that moves on from the previous model. There's allot of history on the proto thread so I'll stick to essentials, but with more detail as I "tweaked" right up to the last second prior to mass production.

First off, my thanks to Matsubara san and Taniguchi san. Their work on the rear suspension and coils is superb. My thanks as ever to Even Yu. This guy gave this new built project 199%. I couldn't have asked for more. The Alpair series exist largely thanks to Evan's dedication. My thanks also goes to Lui Yi Ping for a nice "tweaked" front suspension, to Mr Chui being a superb maker of the poly parts; To Rebacca and Will for their work on the cones, And to everyone who's made the effort to get these drivers singing.

1 - Cones. All-new Multiform construction (as per other Gen. 2 Alpairs). The new profile is shallow. The overall depth has been reduced by 20% while 2 additional radii are added to its profile making this cone the most complex we've produced to date.

2 - Suspensions. Lui Yi Ping has "tweaked" the front suspension to reduce load resistance over the first 4-mm of travel. The new Nomex rear suspension is a new light grade synthetic material currently only being used on this driver. Note just how thin it is by looking at the parts pic.

3 - The new coil is a Japan made rectangle wire, tight-wound onto a light alu body. The complete coil assembly weighs under 4g being produced for us by a Japanese maker.

4 - Frame and connectors are all re-designed. The frame includes a new injection moulded seal. This increases the damping factor and makes installation easier. The connectors are new and include extensions for simple cable connection.

Outcomes:
The Alp10 Gen. 2 driver is a large step forward from the old model. It pushes more air, 28 litres compared to 19.5 while total Q is up to 0.35 (old model 0.33). The Resonance frequency on the new model is 36Hz (40Hz on the old model) while SPL remains at 87dB. From the technical standpoint, this driver is delivering allot more for your bucks.

Acoustic performance is improved. Central imaging is wider, mids are clearer and highs go further. I wanted to take the 10 allot further this time around. Essentially, you're going to get more of just about everything. More dynamics, range, depth, clarity etc; But no harshness, the Alp10 Gen. 2 remains sweet.

I'll have to leave the assessments up to you guys but having listened to the new drivers and compared them to the old model for nearly a month, I'm confident you'll like the changes.

Cheers

Mark.
Attached Images
File Type: jpg Alp10-gold_grey-front.jpg (101.1 KB, 2505 views)
File Type: jpg Alp10-gold-btm.jpg (106.2 KB, 2418 views)
File Type: jpg Alp10-parts.jpg (107.0 KB, 2342 views)

Last edited by markaudio; 11th November 2010 at 08:08 AM. Reason: typo fix
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Old 11th November 2010, 07:51 AM   #2
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Alpair 10 Gen. 2 information:

T/S date LMS V4 Anechoic:
Revc= 7.200 Ohm
Fo= 35.386 Hz
Sd= 88.250 cm
Vas= 28.119 Ltr
Cms= 2.543m M/N
Mmd= 7.480 g
Mms= 7.956 g
BL= 5.606 TM
Qms= 2.530
Qes= 0.41
Qts= 0.35
Levc= 93.626u H
No= 0.297 %
SPLo= 87 dB
X max= 8.5-mm (1 way)
Power = 35 watts nom. 70 Max
Coil = 25-mm alu body with rectangle copper winding.

Running in procedure:
This driver is designed to deliver optimum emittance from 350 hours onwards
1 - DON’T USE ANY ARTIFICIALLY GENERATED SOUND!
2 - First 30 hours, use very low volumes. Hours 30 to 100, gradually increase volume but remaining gentle
3 - 100 to 350 hours, add some bass to carefully extend the suspensions.
4 - Remain gentle, sensible use of this driver will yield pleasing acoustic results.

Peak excursion:
The power-train of this driver is capable of shunting +28 litres of air close to its mechanical limit. The power-train of the Alpair 10 Gen. 2 has a mechanical X Max (1 way) of 8.5-mm (in flux). Only 6.0-mm of this feature should be used to handle non-linear “peak-shock” loads, for example the brief roll of a drum beat. For optimum travel of this power-train, linear loads NOT exceeding 4.0-mm is within its capability for a single load period not to exceed 30 MINUTES. The normal driven load should remain with 3.8-mm. For a driver like this, its nice; Together with a well matched cabinet, you'll get a very nice bass. Please DON'T treat them like rock un roll woofs. You'll surely break them if you push too hard for too long.

General care:
Cleaning can be done by using a soft moist cloth. Take care not to press down on the cone, gently guide the cloth across its surface. NEVER press down on the cone with your fingers. You risk serious distortion of the power-train if you engage in this practice.

Cheers

Mark.
Attached Images
File Type: gif Alp10-Freq-No2010-C.gif (106.5 KB, 2336 views)
File Type: gif Alp10-Freq-No2010-B.gif (108.1 KB, 2226 views)
File Type: gif Alp10-Imp-Nov2010.gif (111.5 KB, 559 views)

Last edited by markaudio; 11th November 2010 at 07:54 AM. Reason: typo fixes
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Old 11th November 2010, 08:50 AM   #3
mp9 is offline mp9  United States
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you reported driving the prototype with a 4watt tube amp and this goes against my understanding of it but how likely would you think my 3watt Fi 2A3 amp drive the 10gen2 in a high gain silbury (assuming compatibility), with satisfying dynamic contrast at moderate volume levels?
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Old 11th November 2010, 10:25 AM   #4
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Location: Burlington, NC
When will they be available for sale?
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Old 11th November 2010, 10:43 AM   #5
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Quote:
Originally Posted by mp9 View Post
you reported driving the prototype with a 4watt tube amp and this goes against my understanding of it but how likely would you think my 3watt Fi 2A3 amp drive the 10gen2 in a high gain silbury (assuming compatibility), with satisfying dynamic contrast at moderate volume levels?
Hi Mp9,
I've played the mass production drivers on Tony's 4 watter. Nice and smooth, bass is a bit limited although surprisingly clear considering the limited power although I love 2A3 tubes. I've got some beautiful vintage 2A3's but need a nice small amp to use them. Your 3 watts might be tight for power, much depends on your volume preference and musical taste.
Cheers
Mark.

Last edited by markaudio; 11th November 2010 at 10:44 AM. Reason: additional
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Old 11th November 2010, 10:52 AM   #6
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Quote:
Originally Posted by buzzforb View Post
When will they be available for sale?
Hi Buzz,
North America - Alp6P, Alp6M and Alp10-G2 Drivers already on rout to Madisound by ocean freight. Talk to Brian or Adam at Madisound for an update on arrival time.

EU - Alp6P, Alp6M and Alp10-G2 Drivers already on rout to Blue Planet Acoustic by ocean freight. Talk to Nick or Thorsten at BPA for an update on arrival time.

Japan/Asia - All main dealers in Japan have stock. Other Asian countries can order from me directly. Email - support@markaudio.com

Australia and NZ - Can order from me direct as Dan doesn't currently carry this stock. Email - support@markaudio.com

Russian Federation - Oleg has stock on Grey Alpair 10G2. Email - oleg@eonmail.ru

All other countries, contact me: Email: support@markaudio.com

Cheers

Mark.

Last edited by markaudio; 11th November 2010 at 10:54 AM. Reason: additional
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Old 11th November 2010, 09:32 PM   #7
mp9 is offline mp9  United States
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The transfer function looks nice, better than the A12, to me anyway. I'm sure the A12 would do better with my amp but the Avebury is out therefor it becomes a which is worse wrt how much of a lose of the A12's 89db due to box lose in the pensil 12 vs. the intact 87db of the A10gen2 in a high gain silbury horn?
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Old 12th November 2010, 02:59 AM   #8
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Quote:
Originally Posted by mp9 View Post
The transfer function looks nice, better than the A12, to me anyway. I'm sure the A12 would do better with my amp but the Avebury is out therefor it becomes a which is worse wrt how much of a lose of the A12's 89db due to box lose in the pensil 12 vs. the intact 87db of the A10gen2 in a high gain silbury horn?
Ummmmmmmph...... Not sure why you look at the project so negatively. Going the flee amp rout limits driver/box choices. Better to make a decision, pick an Alp driver model and experiment, aim to "tweak" the box and the system, that's the fun of doing projects like this.

Depending on the set-up, you should get around 91 to 92dB system efficiency from an A12 in Pencil, +3dB or greater gains from using A10 in horn. With 3 watts on tap, you could get a pleasing acoustic outcome provided you don't want high-volume "rock un roll" output.

Cheers

Mark.

Last edited by markaudio; 12th November 2010 at 03:03 AM. Reason: additional
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Old 12th November 2010, 03:15 AM   #9
mp9 is offline mp9  United States
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Wow, and thanks that's very encouraging. So no trouble with the A12/Pencil option and a possibility of the A10mk2/Silbury working too. I really like "manageable" sized double mouthed horns like the Silbury. Choosing between the two won't be easy, i'm thankful for that.
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Old 12th November 2010, 03:37 AM   #10
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Quote:
Originally Posted by mp9 View Post
Wow, and thanks that's very encouraging. So no trouble with the A12/Pencil option and a possibility of the A10mk2/Silbury working too. I really like "manageable" sized double mouthed horns like the Silbury. Choosing between the two won't be easy, i'm thankful for that.
Glad to offer encouragement. One thing I can say, both the A12 and new A10's sound very nice and smoooooooth on good 2A3 tubes. This tube is a personal favourite of mine (Brian Cherry's Joplin 2A3).

Cheers

Mark.

Last edited by markaudio; 12th November 2010 at 03:41 AM. Reason: typo fix
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