Mark's proto 6.5" Woofer, 1" silk Tweet combo - Page 10 - diyAudio
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Old 4th April 2010, 04:05 AM   #91
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Quote:
Originally Posted by mattchan2000 View Post
I am...however....seriously...considering putting the T3 & W6 in my car...Mark...U supply Xover design for car?
Hi Matt,
I'm not so familiar with car audio but I'd be tempted to cross around 4-kHz. From my memory, there's lots of DIY audio sites with cross-over calculators. Take a look at my next post, use the new Woof data and see what you can find. Please feel free to post your web research on this thread, or you're welcome to start a new thread in the Markaudio section.

Cheers

Mark.
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Old 4th April 2010, 04:32 AM   #92
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OK chaps,
This is it, the eleventh hour is upon me. All the mass production components for the Woofs are in and have been QC'd.

Here's the results from making 4 drivers from the mass production parts:

Pre-MP Woof No.6 - WHITE cone model - LMSV4
Sample No1
Revc= 7.000 Ohm
Fo= 32.892 Hz
Sd= 13.998K mm
Vas= 32.238 Ltr
Cms= 1.159m M/N
Mmd= 19.255 g
Mms= 20.207 g
BL= 8.176 TM
Qms= 2.701
Qts= 0.376
Levc= 604.256u H
No= 0.254 %
SPLo= 86.061 dB

Sample No2
Revc= 7.000 Ohm
Fo= 32.734 Hz
Sd= 13.998K mm
Vas= 31.186 Ltr
Cms= 1.121m M/N
Mmd= 20.139 g
Mms= 21.092 g
BL= 8.444 TM
Qms= 2.599
Qes= 0.426
Qts= 0.366
Levc= 611.074u H
No= 0.248 %
SPLo= 85.969 dB

Pre-MP Woof No.6 - BLACK cone model - LMSV4
Sample No1
Revc= 7.000 Ohm
Fo= 34.046 Hz
Sd= 13.998K mm
Vas= 39.473 Ltr
Cms= 1.419m M/N
Mmd= 14.452 g
Mms= 15.404 g
BL= 7.414 TM
Qms= 2.687
Qes= 0.420
Qts= 0.363
Levc= 606.558u H
No= 0.359 %
SPLo= 87.569 dB

Sample No2
Revc= 7.000 Ohm
Fo= 33.630 Hz
Sd= 13.998K mm
Vas= 36.951 Ltr
Cms= 1.328m M/N
Mmd= 15.912 g
Mms= 16.865 g
BL= 7.555 TM
Qms= 2.646
Qes= 0.437
Qts= 0.375
Levc= 598.633u H
No= 0.311 %
SPLo= 86.946 dB

We're pretty much on track with these results. Total Q is a little lower than the last of the hand-built samples. This is much what I hope for as these results will favour manageable size ported/vented boxes from around 14 to 30 litres, sealed around 10 to 15 litres, OK for TL etc. etc.

We're well inside the +/- 5% production variance target. These results are close to +/-2.5%, so the mass production drivers should be very output performance consistent.

Kick off at the assembly factory is Wednesday April 7th.

Cheers,

Mark.
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Old 7th April 2010, 07:34 AM   #93
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Hi Guys,
We've started work on the woofers. First job is the cone sub-assembly. We've already attached the front suspension before Easter so the pics illustrate the next steps in the assembly process.

Looking at the pics from left to right......

First up: Is the nice young lady on the machine; This set-up makes 2 holes near each cone's neck to take the flying leads from the coil to the connector set. The machine also fixes 2 round keeper rings to act as a barrier between the lead and cone material. The Woof 6 is designed around a short power-train (front suspension to the rear of the coil) facilitating a more neutral static centre of gravity (CG). Running the leads through the cone creates sufficient working clearance for the leads under higher oscillatory loads and aids increased mechanical linearity under these operating conditions.

Next, the leads are fed through the keeper rings and soldered into position. The front suspensions exhibit a "wet" appearance around their edges, due to a application of a prep-adhesive. The purpose is to increase the adhesion properties between the suspension and the frame.

The third pic shows the cones entering a low-bake oven. This process cures (fixes) the pre-adhesive. Finally, the cones are stacked ready to enter the final assembly.

More later
Mark.
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File Type: jpg woof6_cone_prep1.jpg (95.2 KB, 366 views)
File Type: jpg woof6_cone_prep2.jpg (85.2 KB, 365 views)
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Old 7th April 2010, 11:24 AM   #94
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Hi guys,
Next stage, rear assembly. These 2 pics give you an idea of the process. We're joining the T-Yoke and magnet. Note the machine has a double glue action. The first is a glue ring laid on to the inside of the Yoke-plate, the second is applied to the magnet.

The frames have their front washer's pre-mounted so now we join both sub assemblies together and centre using a centring tool (the little yellow unit in the centre of the frame). This is a tolerance critical process, explains the amount of activity in the second photo. Let's put it this way, I much "encourage" the workers to check once, check twice, then check it again. If it ain't centred, its "B" for Bin. If I say "B" everyone knows what has to be done.

Back to the line I must go.

Mark.
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File Type: jpg Tyolk1.jpg (87.0 KB, 355 views)
File Type: jpg TYolk2.jpg (110.2 KB, 339 views)
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Old 7th April 2010, 12:49 PM   #95
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Of possible interest fellas........

When you buy a budget driver, chances are the front washer will be riveted on to the rear of the frame (see red areas on left pic). This is the quickest and cheapest method. It works well but there is some risk of loose fix if the process is not carefully regulated. This is one area where the making of some cheaper product can come undone but..........

We've tweaked this method this by adding additional processes.

We use a pressure regulated press to fix the rivets, thus tolerances can be better controlled; And apply a metal bonding agent over the rivets to increase the total fix value on this part of the assembly.

Thought you might to know.

Back to the line

M
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File Type: jpg washer_fix1a.jpg (102.1 KB, 338 views)
File Type: jpg washer_fix1b.jpg (89.8 KB, 180 views)
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Old 7th April 2010, 02:55 PM   #96
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Thumbs up Informative pics

Mark,

Thanks for sharing those. Really interesting to learn more about how drivers are built.

bb
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Old 7th April 2010, 03:32 PM   #97
tresch is offline tresch  United States
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Yes, yes! This is super cool! It's like watching Mr. Roger's neighborhood!

As a forum full of builders-of-things, I'm sure I can speak for everyone and say that this is awesome.

If you can capture some video of your cool machinery at work, that would be even more awesomer
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Old 7th April 2010, 09:08 PM   #98
chrisb is offline chrisb  Canada
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Mark - as you know, I've been mostly attending the Full Range forums, wherein a couple of recent threads have reminded me of this project.

Forgive me if this has already been addressed, but do you have an ETA on dates of availability and pricing for these units?
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Old 7th April 2010, 09:37 PM   #99
CSS/XBL is offline CSS/XBL  Canada
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Quote:
Originally Posted by chrisb View Post
Mark - as you know, I've been mostly attending the Full Range forums, wherein a couple of recent threads have reminded me of this project.

Forgive me if this has already been addressed, but do you have an ETA on dates of availability and pricing for these units?
Chris,

The CSS labeled version in both black and white will be $30 each and as soon a they are ready I'm getting 1 box (9 pairs) of each by air/express and then the rest by sea.

Bob
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Old 8th April 2010, 12:49 AM   #100
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Hi Chris, Bob and all,
Should finish woofs by the weekend. Centring tool removal today, cap fitting, front seals........errrr what else...........sweep testing (worked until 11.30 last night....need more coffee).

Packing.......possibly later today but more likely tomorrow. Still waiting to poly screw bags to arrived.....arrrgh.

Also starting CHR, CHP and Alp 7. But I'm still not happy with the front finish on some of the CHR frames so I'm gearing up for a "B" session!!!!! (remember that's "B" for bin). I think some of you guys call it "kicking bottoms"!!!!!!

More later.

M

Last edited by markaudio; 8th April 2010 at 12:50 AM. Reason: typo mending
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