Fusion-8 builds - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 31 Old 02-28-2019, 02:57 PM - Thread Starter
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Fusion-8 builds

Built a pair of the Fusion-8s. Also ordered the matching center, but will not be building that until I replace our old LED DLP TV to make room for it.

I guess this is a rather abnormal build for me - I didn't modify anything! Well, almost nothing, I'll get to that a little later. On with the pics!

Pile 'o parts:


Tackled the crossovers first. Got the PCBs from @mtg90 (thanks again Matt!):



Have a local Rockler Woodworking store, so off to get the Baltic Birch. All panels for the L/R cut and ready for assembly:


Dry fit to double-check. I'm veneering these, so I built the boxes ~1/16" smaller than the baffle. This will work:


Off we go!



Boxes complete, crossovers mounted, putting the baffles on. Embarrassed to say, I do not have enough clamps...


Couldn't wait to get a listen. These put out an amazing amount of bass in this location:


Back into the shop for veneer:
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post #2 of 31 Old 02-28-2019, 02:58 PM - Thread Starter
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All veneered and sanded. And this is what you want those seams to look like. Right! No seam!



Stained. Minwax Early American, seems to be my go-to color:


Second coat of poly applied. Getting there...


So here's the modification I made. I didn't care for the gloss on the waveguides, so I did a light spray of flat black from a rattle can, let that dry for a couple of days, then wiped them down with a soft cloth (not pictured here). Ended up with more of a matte finish, if I don't like how they came out I can bead blast them later.


Duratex on the front baffle and we're all set. Next time I think I'm going to attempt to spray the Duratex, it is very difficult to get even coverage on the baffle as there is not much flat surface. Final pics:



A big "Thank You!" to @Erich H for his commitment to the DIY crowd!
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post #3 of 31 Old 02-28-2019, 03:35 PM
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Looks really good! Do you like the contrast of the green hemp woofer? I recall seeing a post that someone used a light stain to turn the woofers black. Great job with the WG too. All the workmanship looks very clean. Are you going to do the same treatment for the center or will it be hidden away?
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post #4 of 31 Old 02-28-2019, 04:27 PM
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post #5 of 31 Old 02-28-2019, 04:30 PM - Thread Starter
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Quote:
Originally Posted by notfastenough View Post
Looks really good! Do you like the contrast of the green hemp woofer? I recall seeing a post that someone used a light stain to turn the woofers black. Great job with the WG too. All the workmanship looks very clean. Are you going to do the same treatment for the center or will it be hidden away?
Thanks!

Yes, the woofers definitely have a green tint. I haven't seen them in position in good light yet, but when I do and if I then feel they are too distracting I plan to use some Rit dye on them to blacken them up.

Center will be the same. Bonus there is that the baffle for the center has squared edges, so I can build the box the same size as the baffle, veneer up to the front face and round over that edge with a 1/2" radius router bit. Much easier than trying to get the veneer butted up perfectly to the baffle. My 1/2" bit is not the same profile as the CNC roundover, so I couldn't use that method on the L/R.
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post #6 of 31 Old 02-28-2019, 04:38 PM - Thread Starter
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Quote:
Originally Posted by corradizo View Post
Nice job! Welcome to the Fusion8 club!
Many thanks! Happy to be a member.

I knew I would not be disappointed with them. I am, however, very surprised by the bass response. I am running them full range right now, watching some clips from WoW, Interstellar, etc. without subs. Very impressive, and I only have about 4 hours on them.

A colleague at work is looking for something with good full range response for both music and movies. Going to have him over for a listen, good chance I'll be building another set of these with him after that!
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post #7 of 31 Old 02-28-2019, 05:41 PM
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Those turned out great! Is that cherry veneer?I love the waveguide ,I was never a fan of the gloss finish.
I want to spray my baffles with Duratex.I need to figure out an inexpensive way to do that.
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post #8 of 31 Old 03-01-2019, 05:34 AM - Thread Starter
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Quote:
Originally Posted by markg35 View Post
Those turned out great! Is that cherry veneer?I love the waveguide ,I was never a fan of the gloss finish.
I want to spray my baffles with Duratex.I need to figure out an inexpensive way to do that.

Nothing that exotic . It's inexpensive birch veneer from Menards - https://www.menards.com/main/kitchen...6525695098.htm


I have an inexpensive spray gun, similar to https://www.harborfreight.com/air-to...gun-43760.html. I'll have to give that a try on some test pieces when the weather improves.
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post #9 of 31 Old 03-01-2019, 08:06 AM
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Quote:
Originally Posted by smcmillan2 View Post
Nothing that exotic . It's inexpensive birch veneer from Menards - https://www.menards.com/main/kitchen...6525695098.htm


I have an inexpensive spray gun, similar to https://www.harborfreight.com/air-to...gun-43760.html. I'll have to give that a try on some test pieces when the weather improves.
Looks good.I wish we had Menards where I live.
Thanks for the link to the sprayer.I'll give one a "shot".
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post #10 of 31 Old 03-01-2019, 01:03 PM
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Beautiful! I'm about to order a pair of these. I hope I can make then that nice and that I'll enjoy them in my large living room. Right now I have a pair of Polk r-50's. I'm sure they have to at least be quite an upgrade over my current situation lol.
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post #11 of 31 Old 03-04-2019, 05:33 PM - Thread Starter
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I had some time this weekend so I decided to cut up the panels for the Fusion-8 center. And in my typical fashion I couldn't stop there. I typically wait to post until I have finished the build, but I figured I already posted the L/R builds, so what the heck...

All the panels and bracing ready. Why stop there?


Terminal cup hole drilled, may as well start gluing it up...


Well, there's still time left before my buddy arrives (we made plans to get to the local brewery), so we'll just glue up the bracing. And the other side. And caulk some seams.


And after enjoying some beers (this is always a good idea ) may as well assemble the top and baffle, right? Note I forgot to line the cab with mattress topper before applying the baffle, oops. Might have been the beer...


So, since the box was complete, may as well veneer it the following morning (I did line it with mattress topper before veneering, so Yay! But what a PITA with the baffle in the way)...



And what the heck, sand, file, more sanding...


Got home tonight after work and rounded over the front edges. It became readily apparent that I would struggle using the big router on the face like I had planned with all the gaps for the drivers (I only have a 1/2" shank 1/2" roundover bit, pity), so I went around on the top, sides and bottom instead. That left a lot of hand sanding at the corners and imperfect roundovers, but the Duratex should hide the majority of the issues. Applied stain, will hit it with the poly tomorrow after work.
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post #12 of 31 Old 03-04-2019, 06:53 PM
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+1 for the rit dye treatment

2 light coats, 24 hrs apart, used a soft brush, because, after spraying with small eyeglasses cleaner atomizer
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DIY FAN Denon X4400 , ATI A 2000 for 7.4.6 SCATMOS Sammy 82" 4K/HDR
L/R: Fusion 15 V2 , C: 88 Special , SL/SR: 88 Special(V2) , RL/RR: F-3, TF/TR: Volt 6's TM: SLX, FH: F4Q4
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post #13 of 31 Old 03-04-2019, 07:05 PM - Thread Starter
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+1 for the rit dye treatment

2 light coats, 24 hrs apart, used a soft brush, because, after spraying with small eyeglasses cleaner atomizer
I believe it was one of your posts that put that idea in my head.

I see you have the purple cone variety. The green cones, at least in my room, don't seem nearly as light. We'll see how they look when there's a decent amount of light on them in the summer, but they are facing northeast so that probably won't be an issue. Not much light gets to them in their spots.

But I will be using the Rit dye method if they become an issue!
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post #14 of 31 Old 03-04-2019, 08:01 PM
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WOW! The veneer and duratex look so good together! Thanks for sharing.
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post #15 of 31 Old 03-04-2019, 08:08 PM
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FTR wrt the greenish drivers

on my SS 88's, in low and very low ambient light,

not an issue
tho YMMV
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post #16 of 31 Old 03-04-2019, 08:21 PM
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Quote:
Originally Posted by smcmillan2 View Post
Thanks!



Yes, the woofers definitely have a green tint. I haven't seen them in position in good light yet, but when I do and if I then feel they are too distracting I plan to use some Rit dye on them to blacken them up.



Center will be the same. Bonus there is that the baffle for the center has squared edges, so I can build the box the same size as the baffle, veneer up to the front face and round over that edge with a 1/2" radius router bit. Much easier than trying to get the veneer butted up perfectly to the baffle. My 1/2" bit is not the same profile as the CNC roundover, so I couldn't use that method on the L/R.
Just built there fusion 8 center and the cinema 8s. I think the green is very dark and actually I don't mind it. The light isn't great in my room anyway so ain't nobody but me gonna notice. If the fusion 8s would have been available when I ordered probably would have chosen those over the volt 8s.

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post #17 of 31 Old 03-05-2019, 04:42 PM - Thread Starter
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Just built there fusion 8 center and the cinema 8s. I think the green is very dark and actually I don't mind it. The light isn't great in my room anyway so ain't nobody but me gonna notice.
Ditto. In the room where I have the L/R I don't even notice the green, don't expect those to be a problem. Where I am placing the center is a different story and I may have to darken them up, but we'll see.

Nothing new on the center build tonight, just put the first coat of poly on it. More pictures coming in the next few days.
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post #18 of 31 Old 03-05-2019, 04:45 PM - Thread Starter
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WOW! The veneer and duratex look so good together! Thanks for sharing.
No problem. Not an original thought in my head however , I simply copied what others have already done for the finish. I am pleased with the look though!
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post #19 of 31 Old 03-05-2019, 05:43 PM
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pleased with the look . . very sweet, tight and right

Question. What is your listening distance?

which relates to me wondering about how much better / worse , if more than negligible, will the EOS horns soundfield be compared to the SEOS?

My HTM6's at7.4 ft. as L/R and moderate toein are stellar.

but your room is not my room,

just curious of you consideration 'bout that

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post #20 of 31 Old 03-05-2019, 06:24 PM - Thread Starter
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Quote:
Originally Posted by asarose247 View Post
pleased with the look . . very sweet, tight and right

Question. What is your listening distance?

which relates to me wondering about how much better / worse , if more than negligible, will the EOS horns soundfield be compared to the SEOS?

My HTM6's at7.4 ft. as L/R and moderate toein are stellar.

but your room is not my room,

just curious of you consideration 'bout that
I'm curious about that myself actually. My constraints were in height rather than width, would have loved to buy a wide horizontal center with the 10" or 12" SEOS waveguide and 6" or 8" drivers but alas, that doesn't exist (that I have seen). And depending on how wide it was, it may have been a problem with proximity to the HTM-10s.

Listening to music on the Fusion L/R gives me the impression that dispersion from the EOS is narrower, but I can't tell how much narrower than the SEOS in the HTM-10s as they are in different rooms - The Fusions being in the least-optimal setting. One of these days when I have the place to myself I want to compare them in the same room, but as neither of our setups are in dedicated spaces I have to fit what I can into the space that presents itself.

Much like art, I don't know much about the design/science behind it/makeup, but I know what I like. And so far I am really happy with all of the DIYSG speakers I've built. Expecting the same reaction once I get this Fusion center in place, really looking forward to how it sounds. And BTW, it's replacing a modified Volt-6 center...


ETA: Sorry, I didn't address your original question. MLP is ~11' from center speaker. But this is our living room and we have various positions, across the span of the wall. Definitely not ideal.

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post #21 of 31 Old 03-05-2019, 06:25 PM
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Quote:
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Ditto. In the room where I have the L/R I don't even notice the green, don't expect those to be a problem. Where I am placing the center is a different story and I may have to darken them up, but we'll see.



Nothing new on the center build tonight, just put the first coat of poly on it. More pictures coming in the next few days.
I actually had to shorten my center 1 1/8" so it would just for into my built-in.

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post #22 of 31 Old 03-05-2019, 07:34 PM
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@ the OP

11ft.?

why , that's exactly, mol, my mlp in the living room wrt the F15's . .
seems like a serendipitous conjunction for some easily done A/B testing .

what does an 8" SEOS "sound" like at 11 ft.?

I'll get back to you . .

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post #23 of 31 Old 03-09-2019, 07:24 AM - Thread Starter
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Didn't take pictures of the process after the stain was applied, 2 coats of poly and then Duratex applied to front, just like the L/R:




Running it at low volume so far in the family room, it seems a little thin. Either A) I need to put more poly fill in it, B) it's because I haven't adjusted the setup except for distance or C) a bit of both. New TV supposed to arrive sometime next week, so I'll wait until the center is in it's final spot to deal with that.
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post #24 of 31 Old 03-09-2019, 07:48 AM
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Beautiful job! That center looks awesome.

I vote for option "B" on the thin sound. It took me a good while to get my center (HTM-12) dialed in. It bounced between dialog sounding thin or sounding boomy on the bottom end. I've got it just right now with a combo of mic placement for YPAO and some manual PEQ added. Give your AVR's room correction a shot at it.
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post #25 of 31 Old 03-09-2019, 07:56 AM - Thread Starter
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Originally Posted by jcmccorm View Post
Beautiful job! That center looks awesome.

I vote for option "B" on the thin sound. It took me a good while to get my center (HTM-12) dialed in. It bounced between dialog sounding thin or sounding boomy on the bottom end. I've got it just right now with a combo of mic placement for YPAO and some manual PEQ added. Give your AVR's room correction a shot at it.
Thanks! Pretty pleased with the look of all 3.

Yeah, it will get the Full Monty with regard to setup, once the new TV arrives and I can put it where it belongs. Not overly worried about it at this point, and it's simple enough to add more fill if needed.
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post #26 of 31 Old 03-09-2019, 07:58 AM
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Quote:
Originally Posted by smcmillan2 View Post
And BTW, it's replacing a modified Volt-6 center...
Quote:
Originally Posted by smcmillan2 View Post
Running it at low volume so far in the family room, it seems a little thin. Either A) I need to put more poly fill in it, B) it's because I haven't adjusted the setup except for distance or C) a bit of both. New TV supposed to arrive sometime next week, so I'll wait until the center is in it's final spot to deal with that.
I also built a custom Volt-6 center (I used a pair of round ports for symmetry rather than the stock port), which turned out to be impressively crisp and clear and full-sounding, and I will also be replacing it with a Fusion-8 center, more because I feel the need to upgrade something than because I feel the Volt-6 is lacking at all.

I am surprised you are finding the Fusion-8 to sound thin compared to the Volt-6, but I expect it will be just fine once you re-calibrate.

Take the Red Pill (BassEQ) BassEQ Demo Clips
Video: Sony 85" X900F @ 80" eyes-to-screen (49.4° viewing angle)
Audio: Denon AVR-X4400H 7.2.4 Atmos
Mains: Fusion-15 LR, Custom Tapered Ported Volt-6 Center, Ported Volt-10 Surrounds, Custom 45°/45° Double-Angled Ported Volt-6 Atmos
Subs: The Two Towers (HT18 32cf 11.5Hz x 2), UM18 4cf x 2, Crowson MAs x 4
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post #27 of 31 Old 03-09-2019, 08:11 AM - Thread Starter
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Originally Posted by aron7awol View Post
I also built a custom Volt-6 center (I used a pair of round ports for symmetry rather than the stock port), which turned out to be impressively crisp and clear and full-sounding, and I will also be replacing it with a Fusion-8 center, more because I feel the need to upgrade something than because I feel the Volt-6 is lacking at all.

I am surprised you are finding the Fusion-8 to sound thin compared to the Volt-6, but I expect it will be just fine once you re-calibrate.
To be fair, I haven't compared them in the same spot. The Fusion-8 center is currently in another room, sitting atop a 5 gallon paint bucket (), and I have only listened to it at low volume. It will be fine, and an improvement over the Volt-6 center, once I can place it and tweak everything.

I agree with your assessment of the Volt-6 as a center. I have been pleasantly surprised by it's capabilities, and that center will be moving into the family room.
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post #28 of 31 Old 04-28-2019, 08:34 AM
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How hard is it to get the veneer accurately butted up to the DIYSG standard round-over like you did? Any tips or tricks to make this step go well?
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post #29 of 31 Old 04-28-2019, 09:15 AM - Thread Starter
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How hard is it to get the veneer accurately butted up to the DIYSG standard round-over like you did? Any tips or tricks to make this step go well?
Tougher than laying it on flat surfaces, but doable. Here's my method (Note that I built the boxes ~1/16" smaller than the edge of the baffle to do this):

* Using a straight edge and a sharp razor knife, straight cut the edge of the veneer. Test fit it against the baffle edge dry.
* Tape off baffle edge (shown in pics above).
* Apply contact adhesive to substrate and veneer as normal.
* Carefully align the straight edge of the veneer with the baffle edge and stick it. Dowel rods help here, place them lengthwise on the substrate. This helps keep the veneer from sticking in an unwanted spot. Slowly pull the dowel rods from under the veneer, sticking it down by hand as you go.
* Roll/trim as normal.

I will typically allow a "bump" in the middle of the veneer when applying this way, parallel to the straight edge. This way I can smooth the veneer towards the edge I'm butting it up to, forming an even tighter butted edge. (Think dowel rod in middle of veneer, stick both edges on either side, then hand smooth the "bubble" out toward the baffle edge).

If the seam ends up wider than you like, wood filler can be used to fill that gap. Just be sure to sand that area well, as the filler will also fill the woodgrain and then not match the rest of the piece.

Having said all that, it is much easier to start with squared edges, veneer/trim to the edge, then apply the roundover (as I did with the center build).
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post #30 of 31 Old 04-28-2019, 10:20 AM
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Have you had any more time with the Fusion 8 center to assess its performance and sound?


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