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Discussion Starter · #1 · (Edited)
Final Product





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Original Post ---------------------------


I don't know why I'm building these except that I don't have anything 'finished'. All my speakers are test boxes with half done XO'ers and robbed of parts.

I wanted these light weight, because I don't know how I'll use them. They will probably even see some PA use. Ya, not exactly ideal, but might be fun.

SEOS12 matte
DNA-360
Celestion FTR12-3070C x 2

The second woofer will be in a second box and I plan to make it somehow optional. Not sure how the XO will work for that.

Rip the maple veneer plywood to width
http://s874.photobucket.com/user/tu...4-4F95-8777-38BEBDA6F497_zps37phlufu.jpg.html

Dado the backside with a 3/4" stack
http://s874.photobucket.com/user/tu...5-4FFF-98D5-4185E4B832C9_zpsdigmx79o.jpg.html

My son interrupted me already and wanted to do some bowl turning.
http://s874.photobucket.com/user/tu...A-4EFF-9263-19560ED6FDE4_zps2qy8zthr.jpg.html

Cross cut to within 1/2" of final dimensions
http://s874.photobucket.com/user/tu...F-4262-8DB4-5F7853262943_zpsw4k55oa6.jpg.html

Setup the cross cut sled for mitres
http://s874.photobucket.com/user/tu...4-4EB2-B6B0-157E00B03CC7_zps7ymqydej.jpg.html

Use a stop block to get equal lengths
http://s874.photobucket.com/user/tu...1-4F91-B562-AEBCF09423CB_zpsq3npal35.jpg.html

Gonna biscuit join for strength on that mitre, so I test it on some scrap MDF. If I screw up these mitres, this rather overpriced plywood has been wasted, although I could do corner infills out of walnut or something.
http://s874.photobucket.com/user/tu...C-4188-BB16-EB8636B1E769_zpsbyp0zpy1.jpg.html

I wanted to veneer with this birdseye maple, but barely didn't have enough, even if I didn't veneer the bottoms.
http://s874.photobucket.com/user/tu...9-4C0B-8123-BE8CC4DF2E8F_zpsrknnh0ub.jpg.html
 

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Discussion Starter · #2 ·
Carrying on.


I made this clamping block to protect to mitred corners out of a scrap piece of 2x2 maple.
http://s874.photobucket.com/user/tu...1-48FD-BB05-5FB3B366F370_zpsinqmnibs.jpg.html


All biscuits are cut and ready for assembly.
http://s874.photobucket.com/user/tu...1-46A4-8AF8-C7F9FE20511D_zps5uu30rpg.jpg.html


First problem. I was not aware my table saw was cutting so steep. Thankfully, this is workable. You can see the biscuit hiding in there. They do an excellent job of alignment, better than I expected.
http://s874.photobucket.com/user/tu...2-426B-B486-BCFBE2631E02_zpskovvyudl.jpg.html


Just before clamping
http://s874.photobucket.com/user/tu...5-4C79-95A4-5A798EC0057F_zpspgndwzdy.jpg.html


Sizing up the MDF baffles
http://s874.photobucket.com/user/tu...F-4672-BBB0-471D76AA6B7A_zpsgjv4kmev.jpg.html


Making a template to route the waveguide recess using one of Erich's CNC baffles
http://s874.photobucket.com/user/tu...A-436F-A054-96DD80DA855D_zpsn1guecpa.jpg.html


Rough cut out
http://s874.photobucket.com/user/tu...6-4BB7-A9E5-A3D635E80DA3_zpsofn9ufip.jpg.html



Tonight I finish the waveguide template and start routing the baffles. Will also reinforce those halfway open mitre joints with some epoxy.


Stay tuned
 

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Discussion Starter · #3 · (Edited)
This post will contain the data I collect on the Celestion FTR12-3070C as it comes in.

First, free air impedance right out of the box (no break in).



In the box (looks like a 52hz tune)



Frequency response (blue line, green is the tweeter)



Will update this post once I have more data on it.

------------------------

Here's the on axis response with and without the grills. Blue is without grills.



Here's the horizontal at 0, 30, and 60 degrees.



And here's a ground plane measurement for the bass response.



The 50hz tuning is about 7db down from average. There's a bit of a bump around 150hz.
 

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Thanks for sharing. I love threads that share the details and techniques like this.


Did you consider doing the 2-step router-around-the-waveguide method for the waveguide template? That seems easier and likely to produce a better template than what you are doing.


-Max
 

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Quote:
Originally Posted by tuxedocivic  /t/1523167/enough-theory-talk-i-gotta-build-something-celestion-ftr12-3070c/0_50#post_24499549


Carrying on.


Sizing up the MDF baffles
http://s874.photobucket.com/user/tu...F-4672-BBB0-471D76AA6B7A_zpsgjv4kmev.jpg.html


Tonight I finish the waveguide template and start routing the baffles. Will also reinforce those halfway open mitre joints with some epoxy.


Stay tuned

Only a single 1x2" brace?



You are not nearly as obsessive as I expected you to be.


+++


About that brace: Did you simply fit it to the sides and slide it in? Then simply glue it in place? What I am wondering, is if there is any pre-loading or tension on the cab walls?
 

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Discussion Starter · #7 ·

Quote:
Originally Posted by maxcooper  /t/1523167/enough-theory-talk-i-gotta-build-something-celestion-ftr12-3070c#post_24499645


Thanks for sharing. I love threads that share the details and techniques like this.


Did you consider doing the 2-step router-around-the-waveguide method for the waveguide template? That seems easier and likely to produce a better template than what you are doing.


-Max

You're welcome. I didn't think of that. I think this will go well enough and I figured would be simpler. I'll see how the template turns out. If it's not tight, I'll chuck it and try something else.
Quote:
Originally Posted by wvu80  /t/1523167/enough-theory-talk-i-gotta-build-something-celestion-ftr12-3070c#post_24499775


Only a single 1x2" brace?



You are not nearly as obsessive as I expected you to be.


+++


About that brace: Did you simply fit it to the sides and slide it in? Then simply glue it in place? What I am wondering, is if there is any pre-loading or tension on the cab walls?

Ha, no that's not the only brace. I'll be doing more once the baffle is on and I know where the rear of the CD and woofer motor are. I'll also be running dowels front to back that'll go through the back piece. You'll see



That lone brace was just friction fit (pretty tight) with glue. I'll be giving it a dose of epoxy as well. I threw it in there because I had the scrap and new I'd be epoxying the mitre joints anyways.
 

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Discussion Starter · #10 ·
Well, this should have more bass capabilities. I guess my goals for this speaker are:


Able to run without subs, but will use subs when possible.

Very strict standards for frequency response (the XO is going to be insane).

Portable (to a point).

Look good.

Sound very good.


I think this will have better bass capability as 2x12" woofers should outperform 2x10" woofers easily. But I actually would not be surprised if the 1099 was still a higher fidelity speaker. A dedicated midrange shouldn't be ignored. I'd like to build a pair of those this summer. My mids are ruined and I've robbed the rest of the parts. So I will just buy the kits like everyone else and do it right. Mine were in modular test boxes. Not exactly "finished".
 

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Tux, any drawings for this speaker to let us have a rough idea how this speaker would looks like? I'm extremely interested in this
 

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Quote:
Originally Posted by tuxedocivic  /t/1523167/enough-theory-talk-i-gotta-build-something-celestion-ftr12-3070c#post_24500267


Well, this should have more bass capabilities. I guess my goals for this speaker are:


Able to run without subs, but will use subs when possible.

Very strict standards for frequency response (the XO is going to be insane).

Portable (to a point).

Look good.

Sound very good.


I think this will have better bass capability as 2x12" woofers should outperform 2x10" woofers easily. But I actually would not be surprised if the 1099 was still a higher fidelity speaker. A dedicated midrange shouldn't be ignored. I'd like to build a pair of those this summer. My mids are ruined and I've robbed the rest of the parts. So I will just buy the kits like everyone else and do it right. Mine were in modular test boxes. Not exactly "finished".

You're going to have to go into greater detail on the differences when you're done. I'm very interested to hear the design decisions/understand them.


I'd find it very amusing if you bought a kit from EricH for a speaker you designed as well lol.
 

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Discussion Starter · #13 ·
Werewolf, I don't have a drawing. Its gonna be something like the tempest, with another 2/3 sized both under it without the waveguide but same woofer. It'll start to take shape soon.
 

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Discussion Starter · #14 ·
Template worked out good.



I fasten the template to the baffle using 18ga nailer into the surrounding material that gets trimmed off eventually



I forgot how must dust routing in MDF makes. I should have done this inside. I don't have proper dust collection. I wear a mask.



While I have the woofer out for measurements. I picked this driver partly based on looks.





Routing the driver recess didn't go well. Bondo up the boo boo.



Quickly cut some ports before heading in for the evening.
 

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Air gun for the dust
That's the most efficient way of getting it all over everything. Where's your vacuum?


Celestion makes some great drivers. I am sure this will turn out to be a really nice design.
 

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Discussion Starter · #16 ·

Quote:
Originally Posted by mtg90  /t/1523167/enough-theory-talk-i-gotta-build-something-celestion-ftr12-3070c#post_24501288


Where's your vacuum?

.

In the corner collecting dust



I don't have dust collection. And setting up the shop vac every time is a pain. I have a blower to build a dust collector but haven't gotten to it. I have a big door on one side of the shop, and a garage door on the other. With both open and a cross breeze, it all goes out the garage door. That photo of me blowing out the dust was followed by a giant plume of dust out the door. That and I let dust land all over everything in the shop. Ya, sucks, but what ever. Every month or so I do a big clean up
 

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Quote:
Originally Posted by tuxedocivic  /t/1523167/enough-theory-talk-i-gotta-build-something-celestion-ftr12-3070c#post_24501131


Werewolf, I don't have a drawing. Its gonna be something like the tempest, with another 2/3 sized both under it without the waveguide but same woofer. It'll start to take shape soon.
so this is a ported design as well?
 

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Discussion Starter · #18 ·
Yes it'll be ported. Triangle corner ports. They're space efficient and easy to do, plus I like the look. Sealed roll off is a tad high, and I'd like to be able to play full range in a pinch. Tuning will be 50hz. That isn't full range enough for my music tastes, but in a pinch...
 
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