Alpair 7 - out of the bag

markaudio · 16th June 2009, 09:44 AM

Hi Guys,
Since Mark L has "let the cat our of the bag", I've been receiving much email traffic. I'm not able to cope with the various questions and make these drivers at the same time. So here's some basic information from the pre-production units.

I will make a proper post in Vendors later next month once done making these drivers.

Alpair 7 - Extended Full Range unit operating to 30-kHz @+80dB.
New frame - Dia = 130-mm
New cone - all machine formed (not spun)
New U cap - dual bond direct on to a pre-formed edge at top of v coil.
New connector system - separate moulded units interlocked into the frame, colour coded.

T/S - Pre-Prod batch 003 - LMS-4114-06/09
ALPAIR7 - 2 mag. with cover
Revc= 3.600 Ohm
Fo= 65.835 Hz
Sd= 5.027K mm
Vas= 5.148 Ltr
Cms= 1.435m M/N
Mmd= 3.868 g
Mms= 4.073 g
BL= 2.819 T.M
Qms= 1.944
Qes= 0.763
Qts= 0.548
Levc= 19.445u H
No= 0.186 %
SPLo= 84.715 dB
Xmax = 4.5mm (1 way)
Rated at 20 watts cont.

That's it for now. Please email me only if urgent.
Cheers,
Mark.

markaudio · 16th June 2009, 09:46 AM

And a Pic
(Also, my chance to intro our Evan Yu, excellent speaker builder, worth his weight in gold!)

ped · 16th June 2009, 03:13 PM

Very cool!

Will these afford little more spacing between the mounting holes and the edge of the driver cutout? It's a little too close for comfort with the 6's and 10's that I have

planet10 · 16th June 2009, 03:55 PM

Mark,

It looks like the A7 has a double magnet & a cap?

dave

EUVL · 16th June 2009, 04:06 PM

> Since Mark L has "let the cat our of the bag" .....

Maybe we should call it the "Cat" instead.

Patrick

_henry_ · 16th June 2009, 04:21 PM

ALPAIR evolution

looks great

HareBrained · 16th June 2009, 05:17 PM

Mark,

You may want to clearly state on the FR/Z sweeps that they are the preproduction units, in case something changes. You don't want that data to be touted as representative if it turns out to not be.

It looks like an interesting driver. Good luck with finishing the transition to production.

John

markaudio · 17th June 2009, 05:07 PM

Hi John,

Thanks for your reminder. I did say "pre-production" and remind guys that there may be some variation. But, if there are variations, I anticipate such changes will be moderate. Most of you know I work hard to publish driver data that is very close to "actual" performance.

Thanks

Mark.

Scottmoose · 17th June 2009, 06:31 PM

Nice job on the new A7 Mark -looks like it's going to be a great little unit; possibly a little more flexible for different sorts of loads too. I like the reasonably low mass-corner.

badman · 17th June 2009, 06:51 PM

Do these use an aluminum former?

16th June 2009, 03:55 PM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 3	Mark, It looks like the A7 has a double magnet & a cap? dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi

17th June 2009, 06:51 PM	#10
badman diyAudio Member Join Date: Sep 2003 Location: Sunny Tustin, SoCal	Do these use an aluminum former? __________________ Bass is supposed to sound big. A 6.5" is not a woofer size.

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16th June 2009, 03:13 PM	#3
ped diyAudio Member Join Date: Apr 2003 Location: PA	Very cool! Will these afford little more spacing between the mounting holes and the edge of the driver cutout? It's a little too close for comfort with the 6's and 10's that I have

16th June 2009, 04:06 PM	#5
EUVL diyAudio Member Join Date: Oct 2003 Location: Optical Valley	> Since Mark L has "let the cat our of the bag" ..... Maybe we should call it the "Cat" instead. Patrick

16th June 2009, 04:21 PM	#6
_henry_ diyAudio Member Join Date: Jun 2002 Location: Indonesia	ALPAIR evolution looks great

16th June 2009, 05:17 PM	#7
HareBrained diyAudio Member Join Date: Mar 2009	Mark, You may want to clearly state on the FR/Z sweeps that they are the preproduction units, in case something changes. You don't want that data to be touted as representative if it turns out to not be. It looks like an interesting driver. Good luck with finishing the transition to production. John

17th June 2009, 05:07 PM	#8
markaudio diyAudio Member Join Date: Nov 2008	Hi John, Thanks for your reminder. I did say "pre-production" and remind guys that there may be some variation. But, if there are variations, I anticipate such changes will be moderate. Most of you know I work hard to publish driver data that is very close to "actual" performance. Thanks Mark.

17th June 2009, 06:31 PM	#9
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Nice job on the new A7 Mark -looks like it's going to be a great little unit; possibly a little more flexible for different sorts of loads too. I like the reasonably low mass-corner.

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