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Center Channel Project finished after nearly a year of work.


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10 replies to this topic

#1 of 11 OFFLINE   Mike Keith

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Posted November 28 2005 - 04:07 AM

Most of you probably frequent AVS or DIY Audio so this is a repeat for the few who don’t, plus this site has been so slow lately, so I thought it could use another topic, even if its posted in other forums.

Like most of my projects, I seem to take way too much time trying to find the proper hardware or a method of doing something wacky. The time spent isn’t really indicative of the difficulty, just a product of my finicky attitude and desire to do things that no one else would do, plus I always do at least a few prototypes and spend some time listening before I proceed.

The fit and clearances along with the proper hardware for the gimble assy was probably the hardest part of the project, although I now have an even deeper appreciation of the difficulty in aligning grains and matching different pieces of wood together to give a homogenous look. Working with hard and soft woods mixed is another challenge that I find very frustrating at times, especially on a lathe. The full adjustment range exceeds 6 inches at the rear-articulating ball assy, which on second thought was probably the single most difficult to devise and construct. The adjustment can allow close to 30° of angle on the mid/woofer cabinets relative to the tweeter pod. Every part can be removed and broken down like a gun, each mid enclosure pivots on a spring loaded pin that fits into a receptacle and can be depressed for removing the enclosure from the gimble mounting ring once the top thumb screw is removed. Everything is solid Oak or painted MDF to match my mains. The tweeter pod is easily removable with a ¼ -20 bolt behind the faceplate.

The prototype has been up and running for months so I have tweaked the sound to satisfying results already, these little woofers will pack a whallop for their cone area, but a little overprices IMO. Next time a do a set of mains I will more closely consider the cost of the drivers, these nearly broke me.

Woofers- Scan-Speak 8530-K01S
Tweeter- Vifa XT-25 with custom faceplate.
Crossover- Marchand XM44-4 (2.6K 4th order)

Woofers are paralleled (2-way) and powered by the Halo A-52 and a separate channel to the Tweeter. The inside is stuffed with poly batting (4oz) and the inner walls are lined with the same tar slurry goop that I have been using for a while now, total weight for the speaker assembled (without stand) is about 55Lbs. This is about as baffle-less as you can get, which has been my goal for some time now so I think I can move on to other designs finally, OB will be next. Total cost is hard to calculate but I would guess about $750.

Pictures,
http://kingdaddy.lin...Center Channel/

#2 of 11 OFFLINE   Allen Ross

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Posted November 28 2005 - 01:46 PM

Looks nice, hope it sounds as good as it looks.
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#3 of 11 OFFLINE   Mike Keith

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Posted November 30 2005 - 03:46 AM

Wow, this was once the coolest DIY forum around, now it’s a ghost town, what happened? In fact all the DIY forums seem to be dead, no one is interested in others projects any more. So sad.

#4 of 11 OFFLINE   Michael Hartwig

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Posted November 30 2005 - 04:39 AM

Those are certainly a labour of love. Now coupled with your other speaker creations you could have an astounding look to a dedicated listening room. Just speakers, chair, some green plants; all other equipment not visiable. great work!

#5 of 11 OFFLINE   BlakeN

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Posted November 30 2005 - 06:24 AM

Mike- I think you will find a lot more activity at HTGuide.com it seems a lot of the diy forums have migrated to theirs.

#6 of 11 OFFLINE   Mike Keith

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Posted December 02 2005 - 01:55 AM

Michael: Thanks for the compliment. My speakers are however so odd looking I find it hard sometimes to just listen to the music, in reality I would prefer an invisible speaker so I'm not so distracted, but they do make a conversation piece. BlakeN: Thanks for the tip, but that forum is almost totally dedicated to the Modula project, anything else is pretty much ignored.

#7 of 11 OFFLINE   Patrick Sun

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Posted December 03 2005 - 04:12 AM

Thanks for sharing. It looks like a lot of TLC went into the design of the speaker. I wish I had the proper tools (XO design software, and measurment setup) to commit to more speaker design, but I have to face the reality that I don't have enough space for a lot of speaker projects, and my current setup suits me fine for now.
"Jee-sus, it's like Iwo Jima out there" - Roger Sterling on "Mad Men"
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#8 of 11 OFFLINE   John Wes

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Posted December 08 2005 - 03:13 AM

Very, very cool!

#9 of 11 OFFLINE   Matt^Brown

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Posted December 13 2005 - 04:34 AM

That is one amazing looking speaker. I have never tried a DIY project but after seeing that I feel like I can at least build a sub. Thanks for the inspiration.
The Legend is better than reality!

#10 of 11 OFFLINE   Rory Buszka

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Posted December 13 2005 - 08:16 AM

Matt, feel free to ask us any questions as you're designing and building your subwoofer. We could use some activity around here.
"It sounds like it's barfing out the bass." - Zach

#11 of 11 OFFLINE   Mike Keith

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Posted December 15 2005 - 12:23 PM

Amen brother. I also have my DIY Sonosubs up for sale. Thanks Matt.




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