Alpair 10 - Generation 2 - sneak peek - Page 3 - diyAudio
Go Back   Home > Forums > Commercial Sector > Manufacturers > Markaudio

Markaudio Designers and builders of audiophile grade drivers

Reply
 
Thread Tools Search this Thread
Old 12th April 2010, 11:21 AM   #21
diyAudio Member
 
norman bates's Avatar
 
Join Date: Nov 2003
Location: iowa
any new news on this front ?
  Reply With Quote
Old 12th April 2010, 11:06 PM   #22
diyAudio Member
 
markaudio's Avatar
 
Join Date: Nov 2008
Quote:
Originally Posted by norman bates View Post
any new news on this front ?
Hi Norman,
Hope your well and having fun with projects. Yup, I'll be with some Japanese guys at a new Japan run factory on 27th April. First 2 drivers on the planning board are:

Alpair 6 - new paper cone model
Alpair 6 - Gen 2 metal cone model
Alpair 10 - Gen 2 standard model
Alpair 10 - Gen 2 special model

As you may imagine, I'm really excited by the prospect of making drivers with more Japanese technical input and support.

Timeline remains around May June. I may take us longer because I'm keen to include more Japanese know-how.

Will keep this thread up to date.

Cheers

Mark.
  Reply With Quote
Old 13th April 2010, 05:11 AM   #23
diyAudio Member
 
norman bates's Avatar
 
Join Date: Nov 2003
Location: iowa
excellent.

Take your time, better sound is better sound.


Norman

Last edited by norman bates; 13th April 2010 at 05:12 AM. Reason: fast fingers
  Reply With Quote
Old 16th April 2010, 03:54 PM   #24
diyAudio Member
 
FullRangeMan's Avatar
 
Join Date: Aug 2009
Location: Brazil
Default Good news

WOW... Good news, Looks ALPAIR-10 G2 is another winner fullrange driver, Congratulations to MarkAudio.
Any chance for a 16 ohms voice coil to a parallel twin??
Cheers, Gustavo
__________________
>Never go to a psychiatrist, adopt a cat or dog from the streets. On the streets pets live only two years average.
  Reply With Quote
Old 29th April 2010, 05:44 PM   #25
timpert is offline timpert  Netherlands
diyAudio Member
 
timpert's Avatar
 
Join Date: Nov 2004
Location: Netherlands
Do you already have a (preliminary) parameter set for the new Alpair 10?
  Reply With Quote
Old 29th April 2010, 06:58 PM   #26
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
In talking with Mark, i believe, with the standard model, he is aiming at keeping the parameters close enuff to the old one as possible, so that existing designs work. If you recall, Mark also has a poll on the decorative bezel. The purpose of shipping it unattached was so that people could upgrade existing boxes with the Mk 2 drivers.

The special edition will need new box designs.

(i beleive Mark is on a road trip to Oz ATM so his response times might get long)

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 29th April 2010, 07:36 PM   #27
chrisb is online now chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Quote:
Originally Posted by planet10 View Post
In talking with Mark, i believe, with the standard model, he is aiming at keeping the parameters close enuff to the old one as possible, so that existing designs work. If you recall, Mark also has a poll on the decorative bezel. The purpose of shipping it unattached was so that people could upgrade existing boxes with the Mk 2 drivers.

The special edition will need new box designs.

(i beleive Mark is on a road trip to Oz ATM so his response times might get long)

dave

certainly if the net flange / bezel thickness is along the lines of the Alpair 7s we have on hand (i.e. ~9mm), baffle will need to be rethunk for rebated mounting
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi
  Reply With Quote
Old 29th April 2010, 11:31 PM   #28
diyAudio Member
 
markaudio's Avatar
 
Join Date: Nov 2008
Hi Chaps,
I'm still here but will be away next week to meet 2 customers in Sydney, then time out, returning to Hong Kong on 22nd May.

There's allot happening behind the scenes. First, I've just finished arranging the shipping of 2 metric tonnes of drivers to Germany and a metric tonne to Japan. My back is killing me! A note on this: Virtually all the latest Alpair 7 production has been bought by Germany and Japan. I have only a few pairs in stock. Likewise for CHR-70, CHP-70. All BB4-AL (black coned CHR's) have gone to Germany. Woofs and tweets: over half the stock has gone, this includes the white coned model.

Onto the Alpair 10. Last Tuesday, I had all day meeting with the new Japan operated factory. We have started the planning process for production of this driver, and the Gen 2 Alpair 6. There's still more development happening:

Alpair 10:
1 - Matsubara san will deliver 3 new sets of Prototype Japanese ultra low mass coils. They should arrive from Japan by 10th May.
2 - Matsubara san has now delivered 3 new sets of Mk-2 rear suspensions.
3 - I have finished all my cone work. The new profile tooling is complete.
4 - I have also finished the U cap work.
5 - We are re-designing the rear section of the magnet assembly (motor). Pole and rear plate metal grades are being changed.
6 - New A/B bonding agents are being assessed to the cap to cone connection.
7 - The assembly process is being studied and evaluated by the new factory.

The hope is to produce 2 models of Alpair 10. The first will be close to the existing driver. Some minor gains in efficiency and top end. The 2nd. driver will be a "special". The cone will be mass-minimum so finishing will be different. The coil will be shaved down to less that 800 microns. More efficiency will and increased transients are the goal for this driver.

Here's the last test (March) I did using some of the newer parts so its "work in progress". The data is RAW so please don't kill me. Note the upper range between old and new models, also the minor increase in efficiency. Changes at this stage will be small. There's a little more HF gain and range extension from the Jan 2010 test. This I expected but much depends on the 100 hour and 500 hour test. We are close to the wire on how much mass can be shaved off some components. As I often say, I'm not in the business of making "boom bang abang" drivers.

Expect the special model to have T/S something around the figs below. But don't take them as fixed. I still want to work on increasing Vas and Total Q. Lots of alchemy still to do:

LMS - Proto-003-0.08CCAW-A1.5
Revc= 7.200 Ohm
Fo= 46.381 Hz
Sd= 8.825K mm
Vas= 15.940 Ltr
Cms= 1.441m M/N
Mmd= 7.031 g
Mms= 7.508 g
BL= 6.516 T.N
Qms= 1.315
Qes= 0.387
Qts= 0.299
Levc= 74.323u H
No= 0.451 %
SPLo= 89.060 dB

Must dash, lots do do before I fly.

Cheers

Mark.
Attached Images
File Type: jpg Alp_10)new_March.jpg (90.9 KB, 603 views)

Last edited by markaudio; 30th April 2010 at 01:24 AM. Reason: additional info
  Reply With Quote
Old 30th April 2010, 12:09 AM   #29
diyAudio Member
 
markaudio's Avatar
 
Join Date: Nov 2008
Hi guys,
A note on mounting the new Gen 2 drivers. Ideally, the side wall thickness of the front baffle that extends behind the driver's mount should not exceed 8-mm. On our anechoic tests, +10-mm baffles disturb the Gen. 2 drivers by some +/-2dB greater variance in the LF range (<800Hz). Whereas keeping the side walls to around 8-mm or less removes the influence.

Please bear in mind that I designed the frames for minimum air resistance out from behind the cone. So keeping the baffle mount on the thin side around the back driver is worth doing.

For guys using thicker baffles, chamfer the back edge with the largest radius possible to reduce the possibility of a return wave hitting the rear of the cone.

Hoping my quick pic will help.

I'll do a sticky post on this once I've finished the Alp 6's and 10's.

Cheers

Mark.
Attached Images
File Type: jpg mounting-1.jpg (38.8 KB, 592 views)

Last edited by markaudio; 30th April 2010 at 12:38 AM. Reason: typo mending
  Reply With Quote
Old 30th April 2010, 01:18 AM   #30
diyAudio Member
 
markaudio's Avatar
 
Join Date: Nov 2008
Hi Guys

I just been reminded to explain the reasons for much of my tweaking. Sorry this is quick, time is short but briefly........... See - graph - green areas marked 1,2 and 3.

1 - the +dB hump helps to off-set baffle step losses. Less correction (if any) is needed when using my drivers that have this feature.

2 - Lowering the output in the mid range helps the reduce "shout" and "sibilance. Vocals benefit with more balance. In particular, I can't stand vocal sibilance...sssssss. Drive's me nuts so I tweak driver output in this part of the range to help reduce the phenomenon.

3 - Rising HF response usually from 5-kHz up gives more choice on on-off axis positioning. You want more brightness in your music - toe in, want more Jazzy smooth, toe out. I personally tend to listen at about 10 degrees off axis. Suits my room set-up. Pick you position.

I'll do another sticky when time permits.

Cheers

Mark.
Attached Images
File Type: jpg Alp_10)new_March1.jpg (96.1 KB, 599 views)
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Alpair 10 Bass + Alpair 5 - Woodwill Japan markaudio Markaudio 16 26th January 2010 11:48 AM
Alpair 10 and 5 Combination _henry_ Full Range 19 1st June 2009 08:24 PM
alpair 10 box width ? norman bates Full Range 9 15th May 2009 03:54 AM
Alpair 10 Measured T/S Parameters MJK Full Range 12 30th March 2009 06:04 PM
Alpair 10 wide bass driver and Alpair 10 Fullrange _henry_ Full Range 71 15th March 2009 11:37 AM


New To Site? Need Help?

All times are GMT. The time now is 01:18 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2