SEOS Surround Build - Page 5

Java,

Looking good - very good!
I like the finish. Is that a wood veneer on the box?

And a belated Merry X-Mas

Looks like that mount gives you plenty of tilt. What do you think of it? Obviously you have it in a stud. Are they tough enough to hold the speaker up with that kind of leverage?

Wow very cool. I hope those mounts are secure!

By the way, this is the perfect use for this design. The low cross, steep cross over combined with the close driver spacing means you'll have wide vertical coverage all while maintaining the sensitivity and power handling to hang with your mains. I hope you enjoy them for a long time

Looks like that mount gives you plenty of tilt. What do you think of it? Obviously you have it in a stud. Are they tough enough to hold the speaker up with that kind of leverage?

Looks fantastic, Java! Great work.

It looks like the same finish as the mains (paint over the mdf). Incredible finish, that bondo work really pays off!

Thanks for posting a picture of the roller. I was actually going to ask what you used, haha

Thanks for sharing your painting tips. I'll be painting a cabinet soon, and your specific suggestions helps a lot.

-Max

Great work Java, outstanding paint job. Sorry if I missed it, are you lining these with insulation again like the mains?

You do a great job documenting the steps in you builds Java, its good stuff.

I used hurricane nuts on one build. Never again. You don't know frustration until the stuffing gets pulled into to the nut! Good old wood screws work just great and are loads easier in every way.

Oh wow. That looks so much better than my test enclosure

Thanks a lot for documenting all this. Hopefully many others can glean from all the work you've put into this. Hope you enjoy them!

Es muy bueno, no? Si!

This Spring I intend to do a SEOS build concurrently with a Mael-X 18 build. You really did do a great job, man!

I bought a couple Fusion Max kits that use the Delta 10a and DNA-350, so I think this is the same speaker.

It also happens that I'm upgrading from Paradigm Performance speakers: Titan v3 and CC-170 v3!

So this thread will be a big help to this noob.

 

Tuxedocivic's comment about the greater vertical directivity of this design (which is desired in surrounds) has me wondering if it's not as appropriate for a front L/R or L/C/R purpose that I'm using them for?

Edited by Eyleron - 1/14/13 at 9:35am

No it is just that with surround speakers the listening positions are spread out over the vertical axis of the speaker more then they are with the L/C/R, so the wider lobe helps with keeping even coverage over the whole seating area. That is not as necessary for the L/C/R where most listeners are within a narrow vertical window relative to the L/C/R but the wider lobe does not hurt performance.

OK good, thanks. I was worried that it was an intended wide vertical dispersion and would splash the ceiling and floors. 

 

Now that I think about it, since I eventually want to do an AT screen, I suppose I should've requested no front ports so I could port to the side? Or now I'll just have to leave a few extra inches between speaker and screen?

Ya, you got the same kit Eyleron. Thanks for buying it. The name changed from Delta Max to Fusion Max once Erich made the Karma, Fusion, Alpha series names.

I'd like to explain the, imo, biggest advantage to this design over the others since your question relates.

Here is what happens with the speaker when you go from 10, 20, 30 degrees above the on axis. Sorry, this is an old frequency response before I finalized the cross over, so it's a little rough. The trend is the same though. Hopefully this will make sense.



You see the green line there is a bit of a dip starting to form at the cross over point. That dip is much worse IF we raise the cross over point or separate the distance between the drivers (ie. a 12" or 15" woofer).

So let's look at the Fusion Pure with a 1450hz cross over.



Not bad, but worse. Now about 10db down at the cross over.

The thing I'd like to mention is it can be different above and below the on axis. Take a look at the Fusion Pure below axis (sorry, winter came around the time the Fusion Max finished, so I only have simulations to properly show this, the Fusion Pure shows the effect well enough).



You see there are much bigger nulls below axis than above. It's quite difficult to aim the lobe up like that unless using an active cross over, but it did work out for me on this one. I wanted this to happen for a few reasons.

1. We rarely listen while lying on the floor.
2. Floor reflections are easier to absorb with carpet or rugs, than ceiling reflections.
3. When you stand up, you don't want to think, "huh, where did the vocals go?".
4. For surrounds close to the ceiling pointing down (like Java) there is a fair bit of reflected sound off the ceiling.
5. If mounted under a screen, these naturally fire up a little.

Kind of wordy and technical, but hopefully that helps somewhat. In the first few pages of the "hey guys" thread there is quite a debate about how important this is. The truth is, it is important, but sometimes more than other times.

FYI, here is the on axis frequency response of the finished cross over. There is an option in the cross over to change a resistor to change the top end up and down. I use an AT screen so I left it a little up.