Hey guys...we need a little rallying here... - Page 210

Ahh, this one I can field

For about the last year, my HT had been powered by 6 PRO-10s and 1 SHO-10 (center); I recently upgraded the LCR to 3 SEOS-12/DNA-360/KBL 2226J DIY speakers. Its definitely an upgrade, and I'm very happy with the new setup. I plan on redeploying the former L/R PRO-10s as heights in a 9.x setup, once I have additional amplification (receiver does 9.1, but anything more than 7 channels requires external amplification).

The waveguide, CD, and woofer are all higher end components than those in the CHTs. That said, despite using inexpensive components, the CHT speakers are no slouch to my ears, and I upgraded not because I was disappointed in what the CHTs were giving me, but because I started getting hooked on DIY speaker building, and wanted a project. The biggest differences to me are with music (vs. movies), low end extension (since I built ported), and ability to handle high levels without compression (not as much an issue for me, since I typically only listen at -10 dB).

Thanks, Stan.

But the beryllium diaphragms do not improve on the beaming behaviour though, do they? So if the SEOS24 are toed-in 45 degrees with their on-axes crossing over in front of the listening sofa (which center seat is at the usual 60 degrees stereo triangle), would not the top-end response be very rolled-off still, especially for listeners in the outer seats (although within the 90 degree window of the SEOS24)?

That is true. It is a trade-off and I would personally take the beaming above ~13khz. Content above that range is less important but not completely irrelevant. Adding a super tweeter is has its downsides specifically comb filtering and vertical null issues. IMO they were used in the past because large format CDs sounded terrible above 8-10khz.

People make too much over 'beaming behavior'. Humans cannot hear much above 12kHz anyway and the older you are the worse it gets. The further away your couch is from the horn/ waveguide the wider the coverage area is. And if you 'toe in' your loudspeakers the coverage area widens.

The real advantage to beryllium diaphragms is that they move the audible distortion of breakup up and out of your ability to hear it. The results is that everything simply sounds better! And you get silly and wax poetic about this recording has more 'air' than another recording. I have beryllium diaphragms and have NOT regretted making the purchase.

Just my 2 cents. Discount at will.
______________
Best Regards,
Carl Huff
Edited by Carl_Huff - 12/18/12 at 11:16am

Oh that would be sweet indeed. Honestly Seos 12 does not look very sexy with 10" woofer. It would be nice to have them matched visually.

I think they look okay once you actually paint the speaker. The angled speaker box I just mentioned is a little wider than the standard 14.5" that most of these designs use now.

Originally Posted by Erich H View Post
Honestly, just last week while moving things around, I considered getting a price to simply mold a new front plastic baffle with the SEOS-10 built in and just use that same angled rear portion of the box. That would be pretty sweet, but a bit expensive.

+2 for this idea !

News Flash!!
Today; Santa visited me - he was dressed just like a FEDEX guy. And lo and behold what did I find in my boxes?

3 - 350 drivers
3 - SEOS12s
And a big-bad, extremely well packed & BEAUTIFULLY machined face for Big Mal, (aka "BUC")

Erich - THANK YOU!!
Can't wait to get home tonight and play with my new "toys"

Didn't happen unless you've got pictures to prove it.

LOL. You stole our line.

that's what happens when you're smokarzing too much.

Fixed.

I dont't know what you're talking about.

lol. Yeah, something about a SEOS GTG at pgwalsh's...April 20th at 4:20?

Lol....haha

I had that baffle cut a little taller and wider so you could trim it down if needed. I think you changed your box dimensions at some point, so if it doesn't fit, just let me know and I can probably get another one pretty quick. But I believe those dimensions were from your final design. The CNC company has some open time to finally get some sub boxes cut and I can always get a few others things thrown in if needed.

Any word on the B&C 8"?

If not I might try the Swope MTM as that looks like a nice project.

Erich,

The baffle is an excellent fit - thanks!!
Less than 1/4" trimming required. It's already glued on my box. :-)

so where are the photos????

Dr Waslo;
You ask - you shall receive

First a dry fit:

As Erich pointed out the minimum vertical height for my box should have been just a tad taller. It will work out as-is, at 13 3/8". However; I would recommend a minimum of 14", and if you want round-overs or room to add a grill, go 15".

Here it is glued up. So how do you tell if someone is a newbie speaker builder? The answer - shortage of clamps


Cut some 1/4" hardboard, and a crossover test fit.

that looks great. TBH i like your design better then the standard big mal which looks too square IMO

Very impressive Cuzed. You will have an excellent center channel for sure.

Appreciate the kind comments.
However credit to BWaslo, rdrewmc, and Erich for their Big Mal suggestions and support.

Wondering if anyone has tried a SEOS12 with dual 8 inch woofers.

Reason I am asking is that would like to move to an acoustically transparent projection screen, and I will have very little space between the screen and the front wall. I will need three very shallow cabinets, so I think anything >8 inch woofer might not be possible. The 4 woofer designs look nice, but just wondering if a 2 x 8 has been considered.

Is this a fixed screen or mechanical? I was having the same debate, but am going to push the screen forward towards the viewers. Obviously space is a huge factor in this.

The screen would be fixed. This is a dedicated theater room, 17 x 14 x 8 feet. Screen is on the 14 foot wall, and a single row of seating about 2/3 way back. Right now I have a "standard" 120 inch diagonal screen with center channel below and L & R on the sides. I'd really like to get the vocals to be "in" the screen and not below. I have not upgraded speakers in like 15 years, so I think it's time! If I go with acoustic screen (a woven screen), I'd like to not reduce the useable length of the room by more than 8-10 inches. That makes for a very shallow speaker box. I can, however, go way tall and wide on the boxes if necessary to get proper volume. I just thought a pair of 8's would be good for a shallow speaker depth.

If anyone has any experiences to share with SEOS project mounted on-wall and/or used with a woven screen, please share, thanks!

There's an in-wall build somewhere, but I'm having trouble finding it. That may be an option.

cuzed2 is making a SEOS 12 center speaker using 4 6" woofers based on my Malcolm and Daniel designs. It or Daniel (two sixes ) should do what you want. See
http://www.diysoundgroup.com/forum/index.php?topic=115.0

PM member AV Science Sales 5. He built the SEOS12/DNA-360/TD12M and uses an AT screen. Here:http://www.avsforum.com/t/1433151/my-td12m-seos-12-build