Fusion 8 and Ulitmax 8 tower module build! - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 27 Old 04-25-2018, 02:52 PM - Thread Starter
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Fusion 8 and Ulitmax 8 tower module build!

While I've loved my Rocket RS850s I've gotten tired of looking at something I didn't build. I've gone through more than my share of speakers including JBL 3677s, 8340s, 8330s, QSC 2150s, Paradigm, Klipsch , Def techs, Volt 10lx, HTM-12. I recently installed HTM-12s in my theater room and tested them in the living room. I wanted to look at something I built as I've been a DIYer for almost 2 decades.

I've loved modules for years so I figured why not. I wanted something that wasn't too wide but sounded huge and the fusion 8 seemed perfect. I've had many friends rave about them especially for their price. Then it came to subs. I want a clean look and wanted something good down to 30hz. This is a sports, cartoon and hang out room.. I have a theater for the low stuff. After hours of modeling in Winisd the Ultimax 8 was the best I found to model in a net 1 cubic foot box with a tuning around 29hz. This required a 4" port (to keep velocity down) and 40" of port.. a tight fit.




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Last edited by cdy2179; 02-10-2019 at 04:18 PM.
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post #2 of 27 Old 04-25-2018, 02:57 PM - Thread Starter
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post #3 of 27 Old 04-25-2018, 03:04 PM
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Wow! Nice job.
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post #4 of 27 Old 04-25-2018, 03:34 PM
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Those are absolutely GORGEOUS!!!!!!
How are you powering everything and how do they sound ?
Do you have any more detailed pics of the port tubes ? I’m not understanding how they are shaped or run inside the enclosures. Thanks
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post #5 of 27 Old 04-25-2018, 03:37 PM
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post #6 of 27 Old 04-25-2018, 03:44 PM
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Those are FANTASTIC! How do they sound? Do they put those 850's to shame?
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post #7 of 27 Old 04-25-2018, 05:04 PM
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Unbelievable job there, nice one!
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post #8 of 27 Old 04-26-2018, 05:40 AM - Thread Starter
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Thanks guys!

To answer the questions they sound awesome. Everyone knows the fusion 8 sounds huge, detailed, dynamic etc. The UM 8 subs are extremely musical with a ton of chest punching slam.. I basically have the cone area of 2 12s they just have tad high tune at 29hz which was by design. The system is everything I wanted.

I'm crossing them over at 120hz just to let the subs in on the action more and I like the bass a little hot. As you can see in my WinISD response above I tuned some house curve into the enclosure design for fun!

The subs are being pushed with a Crown XLS 1500 and currently the mains are fed off of a Yamaha AVR. The crown used to push the Rockets but I need it on sub duty now. I may get another amp for the main... or maybe I won't. It's not really needed to be honest with the sensitivity of the Fusion 8.

As for the ports here's a pic of them minus the flare ends. Once in the cabinet they can be adjusted. I would have rathered a little more space from the drop down section to the port end but that's the best I could do and this takes advantage of the entire depth and length of the cabinet. Performance is perfect with zero port noise unless I get below tuning and lose cone control so I have a balanced miniDSP on the way to set the HPF.

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post #9 of 27 Old 04-26-2018, 06:50 AM
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post #10 of 27 Old 04-26-2018, 07:01 AM
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That’s a lot of port in the enclosures. How much volume do they take up?
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post #11 of 27 Old 04-26-2018, 07:45 AM
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Marvelous! Really nice job, man. This inspires me to do something modular looking with the Concentrics that I need to build for my main floor. Instead of Ultimax 8's though, I'd be using HT18s.
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post #12 of 27 Old 04-26-2018, 07:46 AM
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They look great!! Did you make the outriggers yourself?
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post #13 of 27 Old 04-26-2018, 07:59 AM
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Very nice!
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post #14 of 27 Old 04-26-2018, 08:16 AM
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Very nice build


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post #15 of 27 Old 04-26-2018, 10:43 AM
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Looks awesome. My OCD would have me flip the top cabinet over so the boxes are mirror images of each other lol....
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post #16 of 27 Old 04-26-2018, 01:00 PM - Thread Starter
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Quote:
Originally Posted by tk123 View Post
That’s a lot of port in the enclosures. How much volume do they take up?
Sure thing. I have that on my scratch drawings at home but just take the OD of thinwall 4" find the area pi (r sq) x length. I think before port and driver deductions I was around 1.4 cubes or so. Of course the flare is a tad different as you don't begin taking it's length into account until half way into the flare.
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post #17 of 27 Old 04-26-2018, 01:16 PM - Thread Starter
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They look great!! Did you make the outriggers yourself?
Thanks.

Yep, I bought some 3' flat stock metal at Lowe's for $7 each .. bought two.

The rubber feet are from amazon.

So all together the feet cost me $22 with hardware. A few bucks for gloss black too.

It took me an hour to cut, shape and drill them out.

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post #18 of 27 Old 04-26-2018, 01:22 PM - Thread Starter
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Looks awesome. My OCD would have me flip the top cabinet over so the boxes are mirror images of each other lol....
That was a big decision for me and couldn't decide. I took pics of the towers with the baffles both ways and let my wife and kids vote as well as a few facebook DIY sites. Almost everyone including the family choose the configuration I went with.

OCD wise it does group the drivers all centered with the ports on the edges so it is symetrical as a unit so I guess it depends on how your OCD looks at it.
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post #19 of 27 Old 04-26-2018, 01:31 PM
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Originally Posted by cdy2179 View Post
Thanks.

Yep, I bought some 3' flat stock metal at Lowe's for $7 each .. bought two.

The rubber feet are from amazon.

So all together the feet cost me $22 with hardware. A few bucks for gloss black too.

It took me an hour to cut, shape and drill them out.

The whole build is super impressive!!
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post #20 of 27 Old 04-26-2018, 01:35 PM - Thread Starter
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I forgot to add this pic. As many know the new drivers are hemp cones and are green. Needless to say I had to find a fix. There are companies that sell speaker dye so I figured clothing dye would work fine and it's dirt cheap. Did some research, bounced the idea off of Erich and that's that. Worked great with 2 lightly misted coats of RIT black liquid dye in a little spray bottle.

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post #21 of 27 Old 04-26-2018, 01:52 PM
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Quote:
Originally Posted by cdy2179 View Post
That was a big decision for me and couldn't decide. I took pics of the towers with the baffles both ways and let my wife and kids vote as well as a few facebook DIY sites. Almost everyone including the family choose the configuration I went with.

OCD wise it does group the drivers all centered with the ports on the edges so it is symetrical as a unit so I guess it depends on how your OCD looks at it.
I'm slippin today lol. I did another look at your configuration and it is how I thought it should be. My brain flipped the driver and port on the top box, hence my comment.

I need some sleep badly as this isnt the first misinterpretation I've made today lol..
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post #22 of 27 Old 04-26-2018, 02:29 PM
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Quote:
Originally Posted by cdy2179 View Post
I forgot to add this pic. As many know the new drivers are hemp cones and are green. Needless to say I had to find a fix. There are companies that sell speaker dye so I figured clothing dye would work fine and it's dirt cheap. Did some research, bounced the idea off of Erich and that's that. Worked great with 2 lightly misted coats of RIT black liquid dye in a little spray bottle.

Excellent! Did you cover the surrounds or just spray them too? I would love to make my 1099 cones black instead of blue.
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post #23 of 27 Old 04-26-2018, 02:46 PM
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Hot damn those are nice! Great job!!
Ditto.
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post #24 of 27 Old 04-26-2018, 03:02 PM - Thread Starter
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Excellent! Did you cover the surrounds or just spray them too? I would love to make my 1099 cones black instead of blue.
I just misted over the green cone and dustcap. Sure a little got on the surrounds but once it dried it all blended in and it looks perfect.
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post #25 of 27 Old 04-26-2018, 03:03 PM
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Excellent job! Where did you find the veneer for the baffles? I love that look, and have just the sub to wrap with it
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post #26 of 27 Old 04-26-2018, 04:27 PM - Thread Starter
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Excellent job! Where did you find the veneer for the baffles? I love that look, and have just the sub to wrap with it
Thanks. It's a pelin burl from this website. I found it in the bargain bin as it had some flaws but I was able to cut most out in driver cutouts and those left add character. I got a lot of 8 sheets at 10"x34" for $40 shipped. I only used 3 sheets so I still have over half of it left. I'm sure I'll do some other projects with it down the road.


https://www.veneersupplies.com/
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post #27 of 27 Old 04-26-2018, 05:11 PM
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Thanks. It's a pelin burl from this website. I found it in the bargain bin as it had some flaws but I was able to cut most out in driver cutouts and those left add character. I got a lot of 8 sheets at 10"x34" for $40 shipped. I only used 3 sheets so I still have over half of it left. I'm sure I'll do some other projects with it down the road.


https://www.veneersupplies.com/
Appreciate the info. Have been on their site before, tough finding 3 or 4' x 8' sheets (I'm sure shipping is an issue there) so I end up buying locally, but if I find myself needing smaller I'll definitely look at them again.
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