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My new DIY SEOS Builds and DIY Subs!

post #1 of 24
Thread Starter 
2013 has been a year of upgrading. I posted the video details in the room transformation thread/forum. I figured I'd detail the relevant DIY portions for audio and video in their respective sections as well.

So I had a "projector" room, but it was time to upgrade. I had the bug for a new projector for quite some time, and after selling one of my toys, I figured it'd be a reasonable trade.

Receiver: Harman Kardon AVR247
Speakers: Athena Technologies WS100 LR and Surround, WS60 Center
Subwoofer: Pioneer 8" in a ported box - approximately 15 years old

Found a Pioneer SC-65 for $750 at the local Best Buy. I know, the Costco 1522 was 599.99, well I'm stubborn and wanted the Elite. I'm an engineer at a large company and we often market two nearly identical items, that to anyone outside would look identical, except one can have better components or a more rigorous level of testing. Not knowing the particulars myself, the extra $150 was worth it.

Picked up rack to put everything on as well. (You can tell some of the story is out of order, the projector isn't yet ceiling mounted here)

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Well the sound was greatly improved with just the receiver, but being good friends with Gorilla83 meant I didn't have enough bass.

Enter the Ultimax 15s:
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Damn, now it meant building boxes. Gorilla helped me through this, setting up the sizes necessary and ripping the plywood. I brought the "flat packs" back to my house and got to assembling.

But my garage was meant for cars (see above) and not woodworking. Luckily my dad's a cabinet maker and I had a few tools laying around. biggrin.gif

Time for a work bench!

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Gramps came over to inspect, and a good buddy helped me get everything level. He's the same guy who helped Gorilla83 and I mount his AT screen.

Now I could begin assembly:

Dry Fit
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Assembly
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Size Shot - See the Vitamin Water Bottle
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Now came the time to decide on a finish. I wanted to try staining the boxes dark black. My dad stopped by and ran the router for the first box and prepped them. We tried a Sherwin Williams stain, but the birch just couldn't get dark enough for my liking:

Much darker than this pic makes it look due to the flash:
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So I went to Woodcraft and got some dye stain. Threw this on top and then some spray clear lacquer satin finish.
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I did two coats of dye stain on one, and a single coat on the other. My impatience meant doing things a bit out of order, but they came out looking tremendous.

A new receiver, a new big projector and now two big subs. I needed an amp to drive them, and I decided upon an iNuke NU6000DSP. Now I needed not only the amp, but some more power. I ran two dedicated 20 amp lines to the room.
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Not my most favorite part!

Still not done. I had a great picture and killer bass, but needed better speakers. DIYSoundGroup and Erich had what I needed. I liked Gorilla's setup, and bugged a few people on the board for their opinions. Thanks Sibuna!

Three Fusion-10 Pures and two Fusion 8s. A lot more work than I anticipated.

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Crossover layout trials:
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I used this piece of plywood as a template and drilled through some 1/4" MDF for the actual boards. I did this all at the same time, keeping the template for any future builds and making an extra... just in case.

Making the first:
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Wiring side:
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Testing:
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In various stages of completion:
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Mounted in the box:
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Wires run:
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Fusion 8s as well:
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Had to try them before finishing them:
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Wow, impressed! Sound was incredible.

Time to clean it up and finish them.
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Much better!
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Now I needed to turn the amp on remotely since I put the outlet for it down in the basement:
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Solid State relay and a signal wire ran.

Oh and I had to manage all of the connections so I made a new four gang outlet layout.

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In the end I eliminated the extra 15 amp circuit from the far right. I kept the wiring inside the box as it was existing and labeled it as containing two power sources.

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Still messy, but you get the idea. The aftermarket outlets didn't fit the standard single rectangular openings for the cover plate, so I took it to work and one of the guys opened up the plate to match their factory covers. It turned out great.

So there it is. My room transformation. There are a ton of skips I've stepped and details I've left out. I also took few pictures of the process and skipped some stages all together. It's a tough room to photograph completely, and I've been too lazy to break out the dSLR setup. Gorilla came by the other night and took some measurements with his Omnimic. I'll post them up later and make sure he comments on it.

All in all, it was a great experience. A lot of work and now all I can think about is if I should move everything downstairs and refinish an area of the basement to suit it. The space I'm in is only 12' x 14' with an opening to the outside hallway. Down in the basement I have a solid 13' x 18' area, with the ability to go wider if I box out the beam a little better.

Thanks for reading and if you have questions let me know!
post #2 of 24
looks great, can't wait to see how all that measures. Only suggestion i have is building a small stand for the center

also make me one of those 12v relay boxes biggrin.gif
post #3 of 24
Nice! Wish I had a work area to play diy in.
post #4 of 24
Thread Starter 
Quote:
Originally Posted by Sibuna View Post

looks great, can't wait to see how all that measures. Only suggestion i have is building a small stand for the center

also make me one of those 12v relay boxes biggrin.gif

Honestly I'd be glad to make you one of those boxes if you'd like. It took me all of 30 minutes, while one of the roommates made dinner I made the box. In reality I can crank out a much nicer piece.

PM me for details if you want to do it.

And I'll fire up the work laptop momentarily and post the measurement results. I'm still a newbie for those, but since I work in the advanced engineering measurements group for my day job, eventually I'll get the hang of it. I'm used to those simple things, like forces and displacements! (We do have a full acoustics team though and I get to play around with their stuff from time to time)
post #5 of 24
They look great!!
post #6 of 24
Rubber ducky makes bathtime so much fun. LOL

Can't wait to see those measurement results and your thoughts on how the 6000dsp handles the load.
post #7 of 24
My gosh you are an animal. You got all that accomplished in the time it took to post one comment. biggrin.gif

Seriously, great job. I love seeing all the recent builds. We went through the sealed 18 craze, and now we're on to the SEOS craze. smile.gif
post #8 of 24
I approve! About time you got this thread up!

Post up some of those omnimic sweeps we grabbed on Friday. Full extension down to 10hz in room and just a few db down to 5hz. biggrin.gif
post #9 of 24
Not to be a downer but I don't like how the inductors are laid out.
post #10 of 24
Thread Starter 
Thanks guys. For timing it was a pretty rush build. The first component arrived March 22nd (Projector) and I really didn't get started with the audio until the night of April 5th. It's been done for a week, so the build was literally every weekend that I didn't have a commitment, and a bunch of nights after work.

The first few weeks with the DIY 15s were with an EP4k, so that's the only reference point I have. The iNuke can push them far beyond their capabilities, it was purchased for headroom and since the pricing isn't far off of the lower wattage DSP models I went with the 6k. I picked it up for $440 shipped, and if I were more patient it would've been $425 with the updated coupon from GuitarCenter.

Erich and the whole DIYSoundGroup community made the SEOS kits a no-brainer. Bang for the buck they're an insane value. I've heard most of Gorilla's setups, and I think the SEOS builds get most of the way towards any of the more expensive setups for a fraction of the price. There's a big time investment and you've still got that last 10% of performance which we all eventually pay and get, but for now it's a good start.

I'll get those measurements up tonight.
post #11 of 24
Nice Carlo.

Gettin it done!
post #12 of 24
Great stuff. Nice to see a Fusion Pure build.

Some suggestions. Raise the center a little. Move the L&R in towards the screen a little and also lower them. And toe them in just a tad more. Give that a whirl. It'll mean getting stands, but hopefully not a problem.

Thanks for posting your build. An incredible job.
post #13 of 24
Thread Starter 
Quote:
Originally Posted by Mrkazador View Post

Not to be a downer but I don't like how the inductors are laid out.

The first few pictures show an earlier version, the picture inside the enclosure shows one at 90*. I had the same concern.

I think the space between the laminated cores is larger than you may think and they should be fine. I'd be surprised if there were any actual detriments to this setup.
post #14 of 24
Thread Starter 
So here are a couple of curves. I'm new, so I'm not sure I'm doing this right. Andrew saved them on my computer and I just reopened them, they were on 1/6th scale by default I suppose.

This is with my subs and mains crossed at 100Hz


This is at 150Hz


Those may be too zoomed out to tell anything:

Here's the 100Hz cross again:


And 150:


I have a few more of other things we tried and other seats.
post #15 of 24
The 150hz curve is weird.

Looks like your subs are 10db hot and you need PEQ at 45hz. Plans for any eq?
post #16 of 24
Thread Starter 
Quote:
Originally Posted by tuxedocivic View Post

The 150hz curve is weird.

Looks like your subs are 10db hot and you need PEQ at 45hz. Plans for any eq?

We had them up a bit for personal preference. The amp has DSP so I will be able to adjust it there. Just haven't had a chance yet.
post #17 of 24
more importantly how does it all sound, as an owner of similar speaker i assume its sounds awesome
post #18 of 24
The graphs were captured at 1/24 smoothing FYI. Like many of us, running the subs flat just doesn't cut the cake. biggrin.gif He has DSP built into his inuke - perhaps we should add USB to your panel so we can plug in from downstairs? biggrin.gif

Oh - and I can attest it sounds awesome. In that size room output was not an issue. We ran through some popular tracks and were averaging around 125db at the LP. eek.gif

There is however still room for more subs. Hahaha. tongue.gif
post #19 of 24
Thread Starter 
Quote:
Originally Posted by Gorilla83 View Post

The graphs were captured at 1/24 smoothing FYI. Like many of us, running the subs flat just doesn't cut the cake. biggrin.gif He has DSP built into his inuke - perhaps we should add USB to your panel so we can plug in from downstairs? biggrin.gif

Oh - and I can attest it sounds awesome. In that size room output was not an issue. We ran through some popular tracks and were averaging around 125db at the LP. eek.gif

There is however still room for more subs. Hahaha. tongue.gif

Second outlet from the left, top left under the HDMI...I already ran a USB.

I'm good. Lol
post #20 of 24
Quote:
Originally Posted by Gorilla83 View Post

averaging around 125db at the LP. eek.gif

There is however still room for more subs. Hahaha. tongue.gif

You guys are animals eek.gif
post #21 of 24
nice write-up.

experimenting with moving the subs around may provide a better frequency response. right now it appears there is a hole around 70hz+/- likely caused by a 1/4 wave reflection off a boundary or two. it would be interesting to see how the response might change if the subs were centered under the screen and aimed at each other. that should clean up the hole in the mid-bass and possibly eliminate the first horizontal room mode.
post #22 of 24
Nicely done! The crossovers look especially clean! How big is the screen and which PJ are you using? Forgive me if you posted that already biggrin.gif

Scott
post #23 of 24
Thread Starter 
Quote:
Originally Posted by LTD02 View Post

nice write-up.

experimenting with moving the subs around may provide a better frequency response. right now it appears there is a hole around 70hz+/- likely caused by a 1/4 wave reflection off a boundary or two. it would be interesting to see how the response might change if the subs were centered under the screen and aimed at each other. that should clean up the hole in the mid-bass and possibly eliminate the first horizontal room mode.

Thanks for the tips. I'll try that! Granted I can't keep the subs there, then there's no place for the center. I need a bigger room!
Quote:
Originally Posted by skeeter99 View Post

Nicely done! The crossovers look especially clean! How big is the screen and which PJ are you using? Forgive me if you posted that already biggrin.gif

Scott

Click the link in my sig. It's a 92" 16:9 screen, home made, with a JVC RS46. Thanks for the kind words.

Quote:
Originally Posted by tuxedocivic View Post

You guys are animals eek.gif

What? I can't hear you. eek.gif Thanks again for the suggestions.
post #24 of 24
Quote:
Originally Posted by 351carlo View Post

Click the link in my sig. It's a 92" 16:9 screen, home made, with a JVC RS46. Thanks for the kind words.

Awesome, maybe I should open my eyes a bit biggrin.gif
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