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DIY Speakers and Subs > DIY HT Design Midrange and HF Candidates
A9X-308's Avatar A9X-308 11:21 AM 09-01-2009
Quote:
Originally Posted by penngray View Post

what woofer will you use? Im using the fatial Pro 12PR300 (from Augerpro) with it.

There would be an AE TD10M below, and a JBL 2241 below that. These are for sides/rears. I already own all the drivers.

mayhem13's Avatar mayhem13 05:14 PM 09-02-2009
PE elliptical guides, the 8" round and the Eminence Dltalight 2510 arrived today! PIx to follow later. I have high hopes for the larger elliptical. The smaller one tapers to an ellipse too soon so i don't think i'll be able to interface it to the SB29 properly but i'll try just the same.
mayhem13's Avatar mayhem13 08:26 PM 09-02-2009
As promised, we'll start with the Deltalight 10. A pretty well made driver all around. Fit and finish are better than i expected and extremely light



The cone has a very slight blue tint to it



Notice the vented pole piece

And the Waveguides



They're kinda flimsy and will probobly require some mass loading of some type



Hopefully the QSC guides will arrive tommorrow. The plan is to route a cavity into the baffle that's 2" thick just in the area that will hlod the tweeter.....faceplate removed of course. With a bit of foam behind the tweeter, should make for a solid mounting point. Then, depending on the finished depth of each guide after machining to get the opening at the right diameter, i'll mount the guides to an overlay baffle and overlay it. Just got finished cutting some MDF panels and drilling the router guide holes using a template this way everything will line up. Did a couple of thinner sheets as 'shims' so to speak.
augerpro's Avatar augerpro 05:18 AM 09-03-2009
Mayhem what holds the SB29 diaphragm to the rest of the driver? The three screws you removed for the faceplate? I just ordered the new neo version since it doesn't seem to have the same mounting system as this one and may be easier to screw to the back of a baffle/waveguide.
mayhem13's Avatar mayhem13 05:31 AM 09-03-2009
It appears it might be glued on but i'm not going to investigate it either as it doesn't belong to me. The Neo SB29 looks interesting and even a bit more efficient too.
augerpro's Avatar augerpro 06:20 AM 09-03-2009
Ooh, that's good to hear. Should be super easy to route a shallow waveguide from wood to move the AC back.
penngray's Avatar penngray 08:01 AM 09-03-2009



Hey Mayhem....is that my SB29?....WTF you taking it apart for !!!





























j/k
mayhem13's Avatar mayhem13 09:12 PM 09-03-2009
No worries Penn, the diamphram is mounted to a plate which is fixed to the housing somehow and the screws that fixed the faceplate can be re-installed and wil keep everyhting in alignment.

Hey Brando, i know you're busy so when you're ready and have the time i'll ship the 2510 your way for some testing. I'm hoping it meets the low HD needs of this design or we may have to go the dual 8" route.
mayhem13's Avatar mayhem13 05:59 PM 09-04-2009
Here's the QSC guide compared to an MCM 6.5". Overall i have a good feeling about the QSC guides and the mounting options. Hopefully be the end of the weekend i'll have them all ready for mounting and testing


mayhem13's Avatar mayhem13 06:03 PM 09-04-2009
For the 2 way fans, here's a cheap Nathan alternative. With dome or CD, about $350 pr.


Jay_WJ's Avatar Jay_WJ 08:22 PM 09-05-2009
QSC WG looks really nice except, with that size, I'd like 6 holes for mounting screws. How stiff is it?
penngray's Avatar penngray 08:26 PM 09-05-2009
Quote:
Originally Posted by Jay_WJ View Post

QSC WG looks really nice except, with that size, I'd like 6 holes for mounting screws. How stiff is it?

Its fine with 4 screws. You have to realize that the CD used is the celestion 1425 and its a very light CD compared to the BMS or B&C.

I guess if we are using the heaver CDs then it might need more screws but then I would just add a brace inside for the CD to sit on.
A9X-308's Avatar A9X-308 09:04 PM 09-05-2009
Quote:
Originally Posted by penngray View Post

Its fine with 4 screws. You have to realize that the CD used is the celestion 1425 and its a very light CD compared to the BMS or B&C.

I guess if we are using the heaver CDs then it might need more screws but then I would just add a brace inside for the CD to sit on.

I wondered about this but decided I'd use some sort of support for the drivers (B&C and Emilar) that I plan to use on these WG's if I'm not comfortable when I try them.

I ordered 4 of these WG's on Friday. Due in about a fortnight.
mayhem13's Avatar mayhem13 10:16 PM 09-05-2009
Quote:
Originally Posted by Jay_WJ View Post

QSC WG looks really nice except, with that size, I'd like 6 holes for mounting screws. How stiff is it?

My mounting plan involves the SB29 recess mounted on the baffle with the WG mounted to a removeable overlay so it won't have to support the tweeter. The overlay baffle will also serve to pretty things up by covering the mounting ring of the 2510 and 6md38.
penngray's Avatar penngray 10:28 PM 09-05-2009
Quote:
The overlay baffle will also serve to pretty things up by covering the mounting ring of the 2510 and 6md38.

Im very interested in how you are doing that!
LTD02's Avatar LTD02 11:05 PM 09-05-2009
well, this application seems spl limited from the outset, but i will sit by and see how it develops. maybe i will be surprised. i support the initiative and experimentation in any case! ;-)
mayhem13's Avatar mayhem13 09:39 AM 09-06-2009
Quote:
Originally Posted by penngray View Post

Im very interested in how you are doing that!

I'm gonna start with a conventional box with the woofer and mid surface mounted. The area of the box that houses the tweeter will be comprised of three layers of 3/4" mdf with a 2.75" diameter hole routed to 1.5" deep and the back lined with a thin layer of felt, then the tweeter dropped in. The MCM waveguide when machined for the correct interface is 1" deep, so i'll recess mount that to a baffle cover plate of 1" mdf. This baffle cover will also have holes routed for the other drivers and recesses from behind to cover the woofer/mid mounting rings and will have an appropriate roundover. The baffle cover will be secured with 6 fasteners to the enclosure which will also act as grill guides. This is just the mockup of course, as i just bought a nice Delta Pro Planer and joiner so i see a hardwood bezel of somesorts coming soon. Just chopped up some nice motorcycle shipping pallets of real "5/4" white oak and a local woodworker supply shop has some odd lengths of Walnut for cheap.
augerpro's Avatar augerpro 08:14 PM 09-21-2009
Any results on waveguide testing?
mayhem13's Avatar mayhem13 08:23 PM 09-21-2009
Sorry to all but things have stalled a bit for i was recovering from some fractured ribs and as i'm prepping to move into a new house this friday. Tore down the workshop and yet managed to amass some more tools. Plus my damn wife went and got seaon tickets for the Jets.....so i'm gonna loose a few sundays for a while.....unless they start losing again.

Considering the bathrooms circa 1979 decor, it's a matter of priorities really. I think Dan's hot on the job market these days and i don't wanna impose.

The QSC and MCM are ready to go so at least there's some progress.
penngray's Avatar penngray 08:25 PM 09-21-2009
My best friend is a HUGE Jets fan...J.E.T.S JETS JETS JETS
zorg43x's Avatar zorg43x 05:39 AM 10-07-2013
Is there any progress with the QSC waveguides? I'd like to see the measured off-axis response.
But anyway, can't get them nowhere, spare parts only frown.gif anybody knows where to purchase them or likes to sell 'em?
tsloms's Avatar tsloms 05:50 AM 10-07-2013
Quote:
Originally Posted by zorg43x View Post

Is there any progress with the QSC waveguides? I'd like to see the measured off-axis response.
But anyway, can't get them nowhere, spare parts only frown.gif anybody knows where to purchase them or likes to sell 'em?

From Parts Express!!

http://www.parts-express.com/pe/showdetl.cfm?partnumber=245-625
zorg43x's Avatar zorg43x 05:55 AM 10-07-2013
yes, the "152"-ish ones.. but I'm interested in the round "122i" style waveguides, the ones mayhem intended to measure...
tsloms's Avatar tsloms 06:51 AM 10-07-2013
I have no idea then. Have you called qsc and asked them?
zorg43x's Avatar zorg43x 08:28 AM 10-07-2013
no, but emailed, no answer though :/
at my local store they said they could try it, but normally QSC supplies only spare parts for them (e.g. when damaged, in some cases in exchange of the replaced (damaged) part)...
LTD02's Avatar LTD02 08:52 AM 10-07-2013
why would you want a round horn when the seos 12 is more advanced technology?

round horns have increased center to center space and a hole in the on axis frequency response.
zorg43x's Avatar zorg43x 09:38 AM 10-07-2013
I assume crossing at 1200-1400Hz, where the wavelength is still smaller than the distance (center to center, this applies e.g. for 15" as well, crossing point 800-900Hz ), so the drivers will be in phase.
I am not sure why one should use significantly assymetrical wg when you are limited by the smaller dimension anyway. I assume when horizontally aligned, there will unevitably be an unewen power response vertically (the woofer is circular).
I wouldn't say they have a hole, but they should not be listened at 0° but rather a couple of degrees off (so the crossover should be adapted to a flat response at let's say 15°). I guess you can partially improve it with an appropriate foam in the mouth though.
A9X-308's Avatar A9X-308 07:48 PM 10-07-2013
Quote:
Originally Posted by zorg43x View Post

yes, the "152"-ish ones.. but I'm interested in the round "122i" style waveguides, the ones mayhem intended to measure...
I have 4 unused and not needed 122 flares. PM if interested.
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