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Old 26th March 2012, 03:56 PM   #1
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Thumbs up MicroFonken build thread

Just getting started. Built out a cutting sheet and full size templates based on the one page PDF from Planet10*, then did the initial cutting over this weekend from a reasonably clean 2'x4' piece of half-inch birch ply found at the Home Despot.

Click the image to open in full size.

Lots of sanding, fitting and glueing to come, but I'm excited about the potential of these little speakers.



*Big thanks for providing these plans. Please let me know if you have a paypal donations or sales account and if there is a charge for them.

Last edited by liamstrain; 26th March 2012 at 03:59 PM.
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Old 26th March 2012, 04:48 PM   #2
fakeout is offline fakeout  Canada
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? You mean the plans for the μFonkenWK are out?

Is the Fostex FF85WK a model you can't expose to the sunlight? (I think it's not shielded but eventually I won't have a CRT anymore...) And does this model require a filter?
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Old 26th March 2012, 05:05 PM   #3
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I don't know if there are official final plans. I interpolated my own cutting sheet from the µFonken* "preliminary release" PDF on this page: Meet the Fonkens

As far as I know, the FF85WK is not shielded. I don't think sunlight is a problem, I just didn't want to leave them unprotected where the toddler, dog, AND sun can beat down on them.

I do not think there are filter requirements for these - I'll be running them exclusively from my laptop though, so I will probably end up generating a custom eq to my own tastes.
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Old 26th March 2012, 05:13 PM   #4
Nanook is offline Nanook  Canada
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Default You should be excited.

I have yet to hear any pair of Dave's speaker plans that don't sound good (and I've lived with several over the last 3 or 4 years). If you haven't purchased Dave's "eN" versions see if he has a DIY kit to Enable them. You won't be disappointed.
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Old 26th March 2012, 05:33 PM   #5
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by fakeout View Post
? You mean the plans for the μFonkenWK are out?

Is the Fostex FF85WK a model you can't expose to the sunlight? (I think it's not shielded but eventually I won't have a CRT anymore...) And does this model require a filter?
how much sunlight exposure are we talking about?
yes, the driver is not shielded - none of the WK series are
by requirement for filtering, I assume to mean for BSC and or contour EQ for "FR correction"? I think that's rather subjective


Quote:
Originally Posted by liamstrain View Post
I don't know if there are official final plans. I interpolated my own cutting sheet from the µFonken* "preliminary release" PDF on this page: Meet the Fonkens

As far as I know, the FF85WK is not shielded. I don't think sunlight is a problem, I just didn't want to leave them unprotected where the toddler, dog, AND sun can beat down on them.

I do not think there are filter requirements for these - I'll be running them exclusively from my laptop though, so I will probably end up generating a custom eq to my own tastes.

Be aware that all the drivers in the new WK series required revisions to enclosure volumes and/or tuning. Of course I have access to the new drawings, but am not sure if they've been officially released - sometimes they're posted on this forum long before Dave can get around to updated the commercial sites. (life has a way of disrupting even the best business plan)

If not too late I'd confirm your working drawings with Dave before gluing anything up.

I've built dozens of pairs of these and the slightly larger "milli" series, and would make a couple of suggestions re assembly:

1) line the panels with damping material before final panel is glue up
2) reconsider the terminals from those shown in photo to something that can be attached/removed from the outside of the boxes after assembly - there is very little room for access inside these boxes . We use a cheap recessed plastic cup with 5-way binding posts, and there is a nice and cheap surface mount terminal plate by Parts Express. Both of these have terminals on 3/4" so if you like you can use Pomona or similar dual banana plugs.
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Last edited by chrisb; 26th March 2012 at 05:42 PM.
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Old 26th March 2012, 05:47 PM   #6
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Ah - thanks for the tips Chris. I'll see if Dave has some time to take a look at the drawings.
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Old 26th March 2012, 05:49 PM   #7
fakeout is offline fakeout  Canada
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Quote:
Originally Posted by chrisb View Post
how much sunlight exposure are we talking about?
I was thinking if I made a pair for my mother and she put them in her living room, there are glass doors...

Anyway, yeah, I read something about the vent size being slightly different for the WK enclosure. I hope he gets it right. What? A car symbol?
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Old 26th March 2012, 06:58 PM   #8
chrisb is offline chrisb  Canada
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Originally Posted by liamstrain View Post
Ah - thanks for the tips Chris. I'll see if Dave has some time to take a look at the drawings.

maybe I can save you both the time - a quick review of both drawings shows the following:

overall cabinet dimensions unchanged

reduction of 1mm in the height of port to 12mm - since the port actually continues around the back edge of "shelf", that part and the front panel need to be 1mm longer ( i.e. 109 mm)

(if parts are already cut too short and there's none to spare, a couple of layers of veneer / edge-tape should do the trick)

1 mm decrease in height and 2mm increase in width of single port divider to 12mm x 18mm


and I forgot to mention in the early "suggestions" :

even with 1/2" thick material, it's very important to bevel or round over the back side of driver cutouts - whether with trim router or by hand, this is obviously much easier to do before any assembly

and the brace shown coupling to the magnet - even if shy by a "hair", and serving only to brace the 2 sides and back panel, I'd consider this part important

the FF85Wk will need at least 100hrs of break-in playing time (even just mounted in the cardboard box and played for a few days while you're building the enclosures) before it finally settles in to accurately assess the amount of internal fill deemed necessary and adjust any electronic EQ.
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Last edited by chrisb; 26th March 2012 at 07:03 PM.
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Old 26th March 2012, 08:33 PM   #9
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Quote:
Originally Posted by chrisb View Post
(if parts are already cut too short and there's none to spare, a couple of layers of veneer / edge-tape should do the trick)

1 mm decrease in height and 2mm increase in width of single port divider to 12mm x 18mm
When i talked to Chris this AM, i hadn't confirmed that there is a revision beyond what he had. In the current plan the vent spacer is 17mm wide.

A mm here or a vent slot shelf 1mm short is not that big a deal.

If anyone wants a plan of the current revision please email me and i'll send a copy.

dave
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Old 26th March 2012, 08:40 PM   #10
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Fantastic - thank you. Yes, I'm beveling the driver cutout (30 degree via jigsaw).

I've sent Dave my cut sheet as well, and he also had the vent changing to 12mm. Otherwise no major changes.

I will say... bigger boxes are easier... it's hard with my rig to cut these smaller pieces super accurately (less room to clamp the straight edge and square) - but it's a fun challenge.
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