SEOS Surround Build - Page 6

Thanks so much for the explanation. I'm excited to try out your design!

 

If I think that in a year I'll use an AT screen, would you recommend implementing that crossover change option? Or would one be okay letting AVR EQ handle the compensation?

On the schematic you'll be sent (not sure what Erich is doing) there is a note. Resistor - 1 to 3 ohms. Or something like that. If one day you go with an AT screen. Swap in the 1ohm. Or even 0ohm (as in, get rid of it.). It's really subtle though. If it means having to take apart your speaker, I wouldn't be worried about it.

tuxedocivic,

is using these horizonatlly a really bad idea? this is specifically for surrounds.
mine are placed fairly high above the seats, tilted down. I think having the speakers oriented horizontally would give better coverage of the listening area in my case (two rows 4 seats each). what do you think?

That's a good question I've given some consideration, but haven't mentioned it for fear of confusion (can I use it as a center, how about 3 rows of seats, etc.) but since you've asked I'll try and answer.

The short answer is you certainly could use it horizontally.

The long answer, depends on the geometry. No matter, there is always going to be a null in the vertical position somewhere. If you want to cover all your seats, you need to look at the verticals and decide what's not good enough. Maybe for the Fusion Max it's at 30 degrees above and 20 degrees below axis. So depending on where you place the speaker, you have 50 degrees of decent coverage. If you have 2 rows of seats and they're pretty close to the wall, you may not fit into that window. If you have 1 row of seats and can get that row fairly on axis, then ya, pretty good way to do it.

The nice thing about horizontal placement, is the ceiling reflection will be very nice and uniform. So it's not a bad way to go. Also keep in mind, we're talking surrounds. If a few seats miss out on half an octave for a total of a few minutes of the movie, maybe it doesn't matter.

No, this speaker isn't a good choice for a horizontal center in most situations. Maybe if you were sitting a ways back and your seating was only a few seats wide and your side walls were far away. Not a common scenario. I'd like to do a center design that matches this kit though. Thinking

thank you.

just to clarify, I meant turning the whole box on its side so that the horn now has 40-50 degrees horizontal and about 90 degrees vertical coverage. is that the scenario you were discussing?
Normally the horn is also turned 90 degrees so that wider horizontal coverage is maintained. I've seen it done with center channels and pro sound floor monitors. But that's not what i want to do. I figured 40 degrees horizontal should be enough to cover both rows and 90 degrees vertical would allow me to "crossfire" surrounds above the seats in a way similar to the mains heavily toed in.

Yup, that's what I meant to. Maybe Java could do it and tell us how it goes.

If you kept the waveguide horizontal, that would be bad. There would be a very large null in the vertical at modest angles.

They make good mains in a moderate system (by moderate I mean by the standards around here, will slaughter most systems in the other parts of the forum) or surrounds for a really high output system in a large room. As mains, consider these have a higher sensitivity than quite a few of the 12" models.


Oh c'mon You don't want to take down and re-hang those beasts

Nice, please do another build thread.

Ya, I put together a little 8" design. Very budget minded. Uses the Eminence alpha 8a. But likely won't be kitted. If someone wanted to build it, they have to order parts themselves and go through me for help/cross over. The SEOS8 should blend with the SEOS12, but Jeff didn't use the SEOS8. He used an EOS8 I believe.

Your message to the world of noobs that "we can do it!" has inspired me. With apprehension, I'm off to the hardware store to buy clamps sander, paint, etc. My boss doesn't know where his orbital sander is, and everyone else has vibrating sanders that I don't think I want to use. And no one seems to have large enough clamps. 

 

Hey, maybe I'll get so good I'll be building them speakers later with these tools!

 

Yeah with the Paradigms, when I turn it up to -10 calibrated or higher, either the receiver is distorting, or the speakers can't handle more than 100w (which is about all they're rated for, however much that's worth), or a combination of both...because it'd get harsh around 94dB.

Yes I have the ADP-170s. I might move them to the back. I'd thought last year I'd compromise on bipoles for more direct than the dipoles. Due to my narrow room, I'd be interested in small in-walls. I like the SEOS providing uniform directivity, and firing the right speaker at the left seat, so that the closer right seat is off-axis but receives about the same level. 

 

I think it's easy for the experts who've been doing this for year to lose sight over how daunting these projects can be for DIY noobs. Needed tools. The things that can go wrong, etc. 

But Erich grouping the parts in kits, providing flat packs...the designers designing a speaker for every purpose...and great documentation on how to choose what, and then people like you explaining how to put it together and what the pitfalls are in the instructables -- it just makes it so much more accessible to a larger crowd. I was definitely intimidated last year and wouldn't have bitten. The Econowave massive thread and difficulty in finding high-sensitivity designs (they seemed to mostly cater to two channel fans?) put me off a bit. CHT and eD were bitter-sweet.

 

So I'm glad I finally found my next speakers! I'm going to try just the pair to see how that does in my narrow long room, heavily toed in like in Bill Waslo's article. 

Good luck Eyleron! We're always here to help

This is great stuff! You changed it from a "12-part documentary" to a "quick action film."

 

My only wants when watching it were things like "I wish he used two cameras so we could see what he's doing without his hands getting in the way." 

 

Maybe for your next build:

 

• Have you thought of building a rig with a tiny macro lens that you can move with an overhead "crane" so you can run the camera "through" the crossover at low angle, "driving" around the components like they were buildings, dipping under the mono-rail-sized wire at times?  

 

• Maybe you could mount components chosen not just for their stellar audible performance, but also for their aesthetics, thus you can model the Gangnam District of Seoul and turn it into a video that Psy could use?

 

Aside from those super high priority desires of mine...what a fantastic job you're doing with the docs and videos! 

Java,

Nice job on the crossover build video!
I'm sure this will help many with anxieties for this portion of DIY speaker-building

Ha, I was only kidding about the cityscape fly-throughs, but now that you mention using the macro, yeah that would be nice In your honor, I even included one crappy low angle macro from cell phone.

(This Christmas, I either wanted to get myself new speakers, a music keyboard, or an interchangeable lens camera like the Sony NEX or a Micro 4/3. Looks like speakers won!

Love the narrow depth of field!
Functionally educational and aesthetically pleasing.

Imagine changing the focus in the video like a film rack focus effect