New Home for the BG Ribbons - Part 27

[Amphiprion]

Speaking of excuses.... poker night anytime soon?

As for me, I'm pondering an active open baffle system right now. Probably an MTMWW configuration.

[Hank]

Soon, caterpillar, soon.
Regarding your MTMWW, what drivers?

[Saurav]

I'm pondering an active open baffle system right now

Come on in. The water's warm

[Johnloudb]

Chuck, just wondering what size chamfer bit you used on the back of the woofer cutouts?

John

[JonMarsh]

I don't blame you Hank, if I hadn't already jumped into this project I might follow your foot steps.

Here's what I got so far. The thin board is just there for support. I plan on cutting the holes ASAP, then doing the round over work, and putting on the walnut veneer. I made a few errors I need to cover up.

I'm new to real wood working for the most part, and haven't done much, and never used a rooter before. My sound sensitivity issues slow me down as well. Then the weather hasn't helped much. Excuses, excuses, .....

Slow and steady gets it done, John... the slow will seem inevitable some days, but as long as YOU remain steady, it will get done. :B

[Johnloudb]

Slow and steady gets it done, John... the slow will seem inevitable some days, but as long as YOU remain steady, it will get done. :B

Thanks for the encouragement Jon! It's starting to look like a speaker now, just a matter time.

[---k---]

Chuck, just wondering what size chamfer bit you used on the back of the woofer cutouts?

John

Not Chuck, but hopefully I can help keep you moving...

I start with a 3/4" chamfer (you don't have to plunge it all the way down, depending on the thickness. I don't take more than 1/2 the total thickness. I've also used and Ogee bit after the chamfer to open it up more and also a hand rasp. Now that I've done a few speakers, I just lay hands on the baffle and wait until it tells me what it needs.

This is from Jon's Modula MT:


Just get something that looks like that. It will vary based on the driver and the thickness of the baffle.

[Johnloudb]

Thanks Ryan, that pretty much cleared it up for me. I just got this MLCS bit which should do a good job I think.

http://www.amazon.com/MLCS-TripleWing-Chamfer-Bit-Degree/dp/B001G6QCYK/ref=sr_1_1?ie=UTF8&s=hi&qid=1277830927&sr=8-1

Now that I've done a few speakers, I just lay hands on the baffle and wait until it tells me what it needs.

Wow, a speaker muse - cool! :T

[chasw98]

Chuck, just wondering what size chamfer bit you used on the back of the woofer cutouts?

John

Hi John
A little late but here is a picture of the bit I use to relieve the back of the cutout.



It has a 45 degree angle, measures 1 inch from top to bottom (cutting surface) and 1.875 inches in width. It has a 1/2" shank. It is called a 'chamfer' bit available at MLCS Club Denon

http://www.mlcswoodworking.com/shopsite_sc/store/html/smarthtml/pages/bt_chamf.html

[Hank]

Hang in there John - you're making progress. Keep posting pics.
Chuck - what's the current state of your project?

[chasw98]

Chuck - what's the current state of your project?

Hank, you must be psychic (or inhaled too many fumes at 3M too long). Since I have worked every weekend since Memorial Day and I was still at work at 10:00 PM last night, I am taking 6 days off in a row.

My goal is to finish the arrays over that period of time. I purchased matte black formica for the front of the units and have 3/4" oak to use around the edges. So far I have one unit torn down and started painting the back side, speaker holes, edges, etc. flat black. Then I plan to apply the formica and route it out, attach the oak, oil it down, reassemble and then do the other one. Here is my start at 9:46 AM today.



Check back, I will try and take pictures as I progress (or maybe digress :cry: )

[---k---]

It's now been almost 2 hours, where's the update.

[chasw98]

It's now been almost 2 hours, where's the update.

Be careful what you wish for :T

After more than a year in the making, finally peeling the protective paper from the plexiglass that holds the planar elements...



What else can you do while paint dries?

[Johnloudb]

Hang in there John - you're making progress. Keep posting pics.
Chuck - what's the current state of your project?

Thanks, a few days ago I started a separate thread for my speaker build, with pics here:

https://www.htguide.com/forum/showthread.php?t=36874

Chamfering is up next.

Chuck,

Sounds like a good plan for finishing the speakers. 6 days(?) - good luck!

No, you move a tad faster than me. Will be fun to watch.

[Hank]

Atta boy, Chuck! Go John!
I think my problem is all the solder fumes I've inhaled over the years, since I built my H.H. Scott LK-48B tube integrated amp kit when I was about 15 - 16. :stupid2:

[chasw98]

Atta boy, Chuck! Go John!
I think my problem is all the solder fumes I've inhaled over the years, since I built my H.H. Scott LK-48B tube integrated amp kit when I was about 15 - 16. :stupid2:

Youngster! Heathkit shortwave receiver at 11 years of age. Yes, tubes.

[ThomasW]

You kids settle down or you'll both be grounded.... :B

Heathkit Stereo AM/FM receiver .... when 13yrs old

[chasw98]

You kids settle down or you'll both be grounded.... :B

Heathkit Stereo AM/FM receiver .... when 13yrs old

I know you're lying! Electricity hadn't been invented when you were 13!

[chasw98]

For all you toolhounds (Ryan & jonmarsh), this is how you set your blade at 45. Oh, and there is a picture of the formica on the array and routed out.

[ThomasW]

I know you're lying! Electricity hadn't been invented when you were 13!

Better tread lightly, because it's against the law to abuse an 'at risk' individual....... Now where did I put my cane? ....

And yes Wixey makes fun toys.... :T

[Ray Collins]

EA3 Heathkit amp and DX100 transmitter when I was 13...1958?!

Ray

[JonMarsh]

Youngster! Heathkit shortwave receiver at 11 years of age. Yes, tubes.

Sounds familiar... Heathkit shortwave receiver in 1962. We won't discuss what age that was....

Got the Beatles broadcasts from Chicago on AM with that and my outdoor antenna... life was never the same after that.

[chasw98]

And here are some pictures of the oak trim being applied and, of course, being held in place with a bunch of CLAMPS! No project is complete without clamps!

[Dennis H]

Dang, I'm a late bloomer compared to you guys. Dynaco tube amp and preamp in '66. Too funny that the tube crowd are still 'discovering' these things 44 years later.

Back in the day you could buy replacement tubes at Safeway. Now you have to import them from Russia. I considered replacing them a PITA even back then and was glad to move on. I guess my ear just wasn't golden enough to realize what I was giving up.

Edit: Oh I forgot. I had a crystal AM radio kit in grade school. Pretty crude -- you moved a slider across an open coil to find a station and moved a wire contact thingy over the crystal to get the best signal. All built on a cardboard chassis. Anybody remember those?

[Paul W]

Built my first crystal radio at 6 (no year to be mentioned . Yup, it was soldered!

[chasw98]

And so it goes. The woofers are mounted and wired. I have "refitted" the plexiglass array so that it is a nice snug fit in its cutout and I am reassembling.

[JonMarsh]

Looking like some real progress, Chuck!

[chasw98]

Looking like some real progress, Chuck!

It's getting there. Here is the first one asembled and ready to make music. Paint still drying, oil still curing, though.

[Johnloudb]

Really nice work Chuck! I see you opted against the round over on the edges. Though, I don't think it would look any better that way ... probably look worse.

[JonMarsh]

What, the finish isn't broken in? It'll never sound right that way... you need at least 500 hours burn-in on the finish for the high frequency sheen to cure. :B

[chasw98]

Really nice work Chuck! I see you opted against the round over on the edges. Though, I don't think it would look any better that way ... probably look worse.

Thank you. Actually, if I want to round over the edges I still have the option. I just wanted to get it done and hear and see what it is like in the finished form. But I would have to take them down, disassemble, do the round over, refinish the edges, etc. to add that option too them. Never say never :T

[JimS]

Nice progress Chuck, glad to see you've found some time to get back on this project :T

The black really slims them down and should improve the WAF significantly :B

Now playing with a TADAK dac - my first experience with tubes as I missed out on all the '60s fun . . .

[Hank]

Chuck boy, you are ON FIRE! Go, go, go, go!

[chasw98]

Thank you, Hank.

Here they are in their finished form.





Now all I need to do is get the energy to finish the subs and the equipment rack.

[ThomasW]

Hurray!!!!! :B :B :B :B

[---k---]

Wow. That looks amazing.


I need to show those to my wife... so I look a lot more normal.

[Face]

They look a few inches too short.

Congrats and enjoy!

[Evil Twin]

Now, I see you have finished constructing a new system. At least we found a way to motivate you to complete this project. The Emperor was most displeased with your apparent lack of progress. But now, your skills are complete. Indeed you are powerful as the Emperor has foreseen.

But don't be too proud of this technological terror you've constructed. The ability to destroy your hearing is insignificant next to the power of the Force.

Today will be a day long remembered. It has seen the installation of a new battery in my landspeeder, and the completion of Chuck's line array speaker system.

[Hank]

Chuck, you've done it! :T With the plexiglas "surround", the BG's look like they're floating in space - nice effect. Enjoy!