Mark's new Alpair 12 - Page 2

tinitus · 02:34 PM

Quote:

Originally Posted by markaudio

Hi guys,

Tinitus, Good question. Like so much in this industry, there's no agreed standard.

Cheers,

Mark.

Ofcourse we do know that its NOT one way when you write 12mm Xmax

Many times it enough to KNOW the company, and how they usually spec their drivers
But sometimes it does happen that the same manufactorer use one way on some of their drivers, and peak to peak on a few of their other own drivers, which is very confusing
Its very convenient when they also spec poleplate thickness and voice coil height

freddi · 10th October 2009, 11:40 PM

build a Karlson type for it and apply some serious watts

GM · 11th October 2009, 12:10 AM

Simmed as a T-TQWT indicates Vas is much too low to work in a K.

GM

tinitus · 11th October 2009, 12:59 AM

I wonder, why such high Fs and relatively big Xmax ?

markaudio · 11th October 2009, 02:56 AM

Hi Greg,
I've been made aware of the design support you've given to a competitor. We'll wait to see what others come up with in the way of box plans.

Hi Tinitus,
The windings on the coils are long + my work (and Matsubara San's) delivers a wide X-Max.

The Alpair 10 design is similar to the 12. Its well known for its linearity. You may wish to take a look at some the German reviews as their evaluations are very comprehensive. In particular Hi Fi Selbstbau:

http://www.hifi-selbstbau.de/index.p...tpage&Itemid=1

In their "Datenblatter" section under "broadband chassis" you've find the Alpair 10 review. I think its now a subscription view.

Alpair 12 and Alpair 7's are on their way to Germany and Japan, no doubt evaluations on my design and build work will be done in great depth.

Mark.

GM · 11th October 2009, 04:45 AM

Quote:

Originally Posted by markaudio

Hi Greg,
I've been made aware of the design support you've given to a competitor. We'll wait to see what others come up with in the way of box plans.

Greets!

Not sure who/what you're referring to nor why I should wait on others for alignment ideas.

GM

tinitus · 05:22 AM

Quote:

Originally Posted by markaudio

http://www.hifi-selbstbau.de/index.p...tpage&Itemid=1

Mark.

Ich glaube ich werde mich anmelden

Sure, Xmax is nice
But I will try from a different angle
This Eminence 8" have close to the similar specs (mms), but much better sensitivity
http://www.eminence.com/proaudio_spe...8&SUB_CAT_ID=2
Ofcourse not the quality of yours
If it had the higher sensitivity it might be a fine mate with Mundorfs AMT ribbon

freddi · 11th October 2009, 02:23 PM

Quote:

Originally Posted by GM

Simmed as a T-TQWT indicates Vas is much too low to work in a K.

GM

Beta 8CX "works" in k with Vas of ~20 liter - I've had one mounted in a coupler of ~ 1 cubic foot rear chamber/0.5 cubic foot front - but the aperture may have to be adjusted empirically (especially at the beginning) for best overall tone and front chamber arranged so the coupled-cavity peak is livable -- does front chamber height have some control of response? Carl didn't provide any data on his experiments and ran a 10" Scan Speak in a little coupler (IIRC 27.25"Hx14"Wx12D" which by BP standards would have a big ol' cavity peak. A one fold tapering t-line might shift things away from that condition.

Beta 8CX
Total Q (Qts)
BL Product (BL)
Fs-65.52Hz
Re-5.6
Le-0.85mH
Qms-8.82
Qes-0.34
Qts 0.33
Vas-19.99 liters / .71 cu.ft.
BL-11.1 T-M
Xmax-3.2mm
Sd-210.0 cm2

Scottmoose · 11th October 2009, 03:14 PM

Quote:

Originally Posted by tinitus

I wonder, why such high Fs and relatively big Xmax ?

Fs is lower than most other wide-band units of equivalent size & Xmax substantially higher while still having a very wide useable BW. That's a problem?

Quote:

I've been made aware of the design support you've given to a competitor.

Mark, I'm not sure of the context here, but FWIW, GM did a couple of (excellent) MLTLs for the JX92S a few years back, which have been on the EJ Jordan site for a long time. Recently, Jordan USA, without asking his permission, let alone offering to pay him a percentage, appear to have started selling the 48in tall design commercially.

markaudio · 11th October 2009, 04:51 PM

Hi Scott,
Thanks for the info.

Hi Greg,
I now understand your past situation re some of your design work. Please accept my apologies and I'd welcome any suggestions you have for cabinet designs. Is it OK to send you a message via the forum?

Hi Tinitus,
I'll explain more about the Alp 12' mechanical properties ASAP.

Cheers,

Mark.

11th October 2009, 12:10 AM	#13
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Simmed as a T-TQWT indicates Vas is much too low to work in a K. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Mark Audio Alpair 10 MLTL Design	Jim Griffin	Full Range	210	5th April 2012 01:11 AM
Jordan JX92S from EAD or Mark Audio Alpair 10?	ilwooz	Full Range	56	20th March 2010 01:26 AM
Mark Audio Alpair 5/CSS SDX7 DIY	Chris74	Swap Meet	4	17th February 2009 02:44 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

10th October 2009, 11:40 PM	#12
freddi diyAudio Member Join Date: Aug 2005	build a Karlson type for it and apply some serious watts

11th October 2009, 12:59 AM	#14
tinitus diyAudio Moderator Join Date: Nov 2005	I wonder, why such high Fs and relatively big Xmax ?

11th October 2009, 02:56 AM	#15
markaudio diyAudio Member Join Date: Nov 2008	Hi Greg, I've been made aware of the design support you've given to a competitor. We'll wait to see what others come up with in the way of box plans. Hi Tinitus, The windings on the coils are long + my work (and Matsubara San's) delivers a wide X-Max. The Alpair 10 design is similar to the 12. Its well known for its linearity. You may wish to take a look at some the German reviews as their evaluations are very comprehensive. In particular Hi Fi Selbstbau: http://www.hifi-selbstbau.de/index.p...tpage&Itemid=1 In their "Datenblatter" section under "broadband chassis" you've find the Alpair 10 review. I think its now a subscription view. Alpair 12 and Alpair 7's are on their way to Germany and Japan, no doubt evaluations on my design and build work will be done in great depth. Mark.

11th October 2009, 04:51 PM	#20
markaudio diyAudio Member Join Date: Nov 2008	Hi Scott, Thanks for the info. Hi Greg, I now understand your past situation re some of your design work. Please accept my apologies and I'd welcome any suggestions you have for cabinet designs. Is it OK to send you a message via the forum? Hi Tinitus, I'll explain more about the Alp 12' mechanical properties ASAP. Cheers, Mark.