Alpair 7 Gen.3 Coming soon - Page 3 - diyAudio
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Old 9th June 2011, 12:01 AM   #21
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hi Mark , have you ever thought of making a 100w rms woofer ? your drivers are so good , would be nice to have something like that
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Old 9th June 2011, 12:37 AM   #22
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So how long until we can play with these? I had planned to get another set pretty soon, might be worth waiting I think.
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Old 9th June 2011, 04:04 AM   #23
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Quote:
Originally Posted by THORNSPAWN View Post
So how long until we can play with these? I had planned to get another set pretty soon, might be worth waiting I think.
Hi Thorn,
At factory now making more drivers. Will post more info later this week.
Cheers
Mark.
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Old 15th June 2011, 03:18 PM   #24
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Default Alp7 Gen. 3 - Mass production data

Hi Guys,
The first batch of Alpair 7 Gen.3's are on their way to Madisound USA. Here's the mass production data:

I'm really pleased with our design modifications on the Gen. 3. Take a look at its frequency range data (particularly the Gen.2 - Gen.3 comparison data). Note we are running these tests in the anechoic chamber to +40-kHz.

This driver is pretty much operating to Broadcast Standard (Fo=70Hz to 30-kHz at no more than 10dB total variance across this range). I feel sure no other single cone driver (no whizz, plugs etc) of this size is capable of equalling this Alp7's performance at this time. It goes to show what can be done to generate linearity over an extended frequency range.

The off-axis response is also excellent. The multi-form cone and under-hung front suspensions are doing their work well. I takes along time in the anechoic chamber to setup the baffles to off-set positions. Fortunately, I had enough time allowed in the chamber to do all the off-axis data collection this time.

Norio and me played the first pair off the line last Saturday. We were mighty pleased although I felt a bit apprehensive. Make sure guys that you get the rest of your system into shape. This Alp really wants to be fed only the best of inputs. You will hear everything!

More detail on the build later

Cheers
Mark.

Alpair 7 Gen. 3 Data (with cover)
REVC 5.4 Ohm
Fo 70.90 Hz
Sd 5.02 K mm/2
Vas 4.58 Ltrs
Cms 1.27 uM/N
Mmd 3.74 g
Mms 3.95 g
BL 3.83 G/cm
Qms 3.07
Qes 0.65
Qts 0.54
Levc 21.30 uH
No 0.24%
Spl 85.80 dB (with rear cover)
Spl 85.20 dB (rear cover removed)
Pwr 20w Nom.
X max 4-mm 1 way
Coil Dia 20-mm
Main tolerance +/- 1.5 Hz on mean Fo
Attached Images
File Type: jpg Alp7-gen.3-fr-raw-june2011-sml.jpg (158.7 KB, 674 views)
File Type: jpg Alp7G2-Alp7G3-fr-comp-sml.jpg (195.1 KB, 665 views)
File Type: jpg Alp7-gen3-fr1530-june2011-sml.jpg (173.6 KB, 585 views)
File Type: jpg Alp7-gen3-imp-raw-june2011-sml.jpg (180.5 KB, 569 views)

Last edited by markaudio; 15th June 2011 at 03:23 PM. Reason: additional
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Old 15th June 2011, 03:29 PM   #25
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Hi Guys,
Here's more pics.
I'll try to make a a full information PDF over the weekend or next week.
Cheers
Mark.
Attached Images
File Type: jpg Alp7-gold-1-sml.jpg (88.0 KB, 554 views)
File Type: jpg Alp7-grey-1-sml.jpg (86.2 KB, 137 views)
File Type: jpg Alp7-components-2-sml.jpg (123.8 KB, 154 views)
File Type: jpg Alp7-components-1-sml.jpg (130.2 KB, 154 views)
File Type: jpg Alp7-gold-box-1-sml.jpg (124.9 KB, 142 views)
File Type: jpg Alp7-grey-box-1-sml.jpg (123.1 KB, 130 views)
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Old 16th June 2011, 08:37 PM   #26
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Default Subscribing.

Mark, sounds fantastic.

When will you ship these to Dave @ Planet10?

I'll reread this thread (read it a while ago) but in short, do you feel that its a substantial improvement over version 2?

Thanks,
UL
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Old 16th June 2011, 08:46 PM   #27
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Quote:
When will you ship these to Dave @ Planet10?
Mine come from Madisound. They usually shape same or next day as they arrive there.

dave
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Old 16th June 2011, 08:49 PM   #28
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Ah Dave, since you are a reseller, I just figured you'd get it directly from Mark Audio. Did not know that Madisound also acts as a distributor.

Thanks Dave.

UL

ps: how in the world do you monitor all these threads and still get work done...
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Old 16th June 2011, 09:01 PM   #29
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Wow Mark, those frequency response plots you great!

Very interested in hearing these. Hopefully Dave has a pair setup at his DIY Fest in august.
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Old 16th June 2011, 09:25 PM   #30
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Ah Dave, since you are a reseller, I just figured you'd get it directly from Mark Audio.
You have to buy a lot more than i do, to be get them direct from Mark. Some day maybe.

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