***Working Man's DIY Dedicated Home Theater*** - Page 22 - AVS Forum
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post #631 of 649 Old 06-25-2014, 04:51 PM - Thread Starter
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post #632 of 649 Old 06-27-2014, 10:39 AM - Thread Starter
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post #633 of 649 Old 06-27-2014, 10:57 AM
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Quote:
Originally Posted by NicksHitachi View Post
Help!
Oooh, Oooh! I see it. It's either the red CAT cable or the gray power wire that's the problem!

Acoustic treatments look good!

Dude, are you made of leprechauns? Cause that was awesome!

The Plains Theater Has Begun
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post #634 of 649 Old 06-27-2014, 11:13 AM
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If time starts running out... Cut the green wire with the red stripe.. or was it the red wire with the green stripe......

My Basement HT Construction ~ Faster than the speed of Dark

"I've cut that piece 3 times and its still too short..."
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post #635 of 649 Old 06-27-2014, 11:56 AM
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post #636 of 649 Old 06-27-2014, 12:09 PM - Thread Starter
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Bahaha it wasnt THAT BAD before i tore out all the equipment...

Sometimes you gotta tear something up to make it better!
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post #637 of 649 Old 06-27-2014, 12:12 PM
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+ MicrobrewS for TMcG =



Maybe I should start drinking..............wished my cable system looked like that!
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post #638 of 649 Old 07-15-2014, 05:15 AM - Thread Starter
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Workingman's theater is still broke down....

While rack was torn out I decided to do it right when I put it back together. I ordered standard rack rails, shelving, and other parts to make rack standard. Since so much of my gear is becoming pro gear with rack mount ears it just started to make more sense, not to mention it should look better and perform better also.





I also ordered a rack mount box which I'll be mounting my minidsp into along with xlr panel mount jacks to make it a tidy box that will also mount in the rack. In case your not familiar the cables have to be stripped and converted to phoenix connectors and that makes for a messy setup IMO without mounting in a box. This will be a fun project I think, I've only seen a couple other people do this and look forward to trying my hand at it. I got the box 2U tall so I can fit another minidsp in there if(when) I need more dsp capability.

Also I found a really cheap source for rack stuff. I haven't received the stuff yet so I'll hold back from a recommendation just yet, but their prices and shipping were extremely good. Here is the box I got to mount the minidsp into:



The door and trim for the rack is complete minus glass installed I'll get some pics of that within a few days and hopefully get glass installed also. I'm hoping to get rack back together within a week or two and then start on my surround speaker build:


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post #639 of 649 Old 07-15-2014, 05:57 AM
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I'm anxious to hear what you think about those surrounds! I'm considering those as well.

Dude, are you made of leprechauns? Cause that was awesome!

The Plains Theater Has Begun
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post #640 of 649 Old 07-15-2014, 07:04 AM
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Nick,

Why the coax instead of the waveguide for surround ?

-

"Too much is almost enough. Anything in life worth doing is worth overdoing. Moderation is for cowards."
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post #641 of 649 Old 07-15-2014, 07:25 AM
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Awesome theater. I'm stealing your landscaping fabric idea for the acoustic panels! I was looking for something cheap to cover the backs of the insulation with, that is perfect

Also really cool diffusor's you built.
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post #642 of 649 Old 07-15-2014, 09:45 AM - Thread Starter
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Quote:
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Nick,

Why the coax instead of the waveguide for surround ?
Form factor is one major reason. AFA performance, center to center distance of the woofer and compression tweeter is 0 so that avoids phase shift for listening positions off axis. IOW when listening on axis to a 2way it should sum nicely for a flat response but as you move further below the vertical axis the speaker the distance to the waveguide gets longer than the distance to the woofer causing phase issues and nulls at crossover unless the speaker is designed that way. For coaxials the center to center is always 0 since they coincide.

It has to do with time alignment of the drivers and the forward lobe of the speaker. Sometimes speaker designers will say the forward lobe tilts slightly downward, that means slightly below on axis the drivers are perfectly time aligned and in-phase. Upward obviously means the opposite.

This comes up a lot when measuring speakers, the exact axis to measure the speaker determines summation at crossover. If you were sitting extremely off axis on a two way with waveguide, you might even find the frequency response to be flatter if you inverted polarity on one of the two drivers, they might actually time align better.

Thats the short answer.....

Quote:
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Awesome theater. I'm stealing your landscaping fabric idea for the acoustic panels! I was looking for something cheap to cover the backs of the insulation with, that is perfect

Also really cool diffusor's you built.
Thanks! Go for it! No patents here....
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post #643 of 649 Old 07-15-2014, 01:15 PM
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The polarity on my FUSION 8's are reversed (tweeter from woofer) and I always thought the tweeter being set farther back in the cabinet with the wave guide in front corrected the time issues ?

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"Too much is almost enough. Anything in life worth doing is worth overdoing. Moderation is for cowards."
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post #644 of 649 Old 07-15-2014, 01:41 PM
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Often, Mike, that's true - but it depends on the phase shifts caused by the crossover. Different filter types have different phase behavior.
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post #645 of 649 Old 07-22-2014, 04:30 AM - Thread Starter
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Mounted Minidsp in Rack Box:










Here is how i handled grounding the shield(pin1) on each input and output:

One short jumper wire from pin1 to body pin.





DIY Rack Mount Minidsp Balanced 2x4 Enclosure

Now I can finish the rack. The rack rails are in and several shelves mounted. Now just need to mount pro gear, install glass in door, and hook it all back up.....

The on to speaker building!!!! Woot!
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post #646 of 649 Old 07-24-2014, 07:10 AM - Thread Starter
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So I guess I can add running one or two more 30A lines to my theater to-do list.... I contacted my electrician today for options.

I found a deal too good to pass on for two more EP2500s

I'm gonna use the two new EP2500s for the mains(3 of 4 channels). My mains stay just under full excursion with 450W with a LR-4 in place at 80Hz. I'll never probably need that power but its good to have too much than too little.

The fourth channel i'll run to the Maelstrom 21. I want to pull it out of the wall(IB) and make a box for it to go up front in the middle front of the screen. The IB tansmits too much energy to the structure in its current baffled installation. If I had another and could install them opposed that would be an awesome option but they are NLA. One channel of the EP2500 will be significantly anemic for that driver in any reasonably sized enclosure but I don't want to put too much power through it as it was one of those "Vegas Subs" that Kevin Haskins liquidated super cheap which most likely has the epoxy problem on the shorting ring. If you heat up the motor too much the shorting ring might come loose and start rattling around in the motor.

The other two EP4000s I'm using to run my sealed MFWs(X8).
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post #647 of 649 Old 08-10-2014, 01:22 PM - Thread Starter
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Got a build thread going in the DIY speakers forum for my Volt-10s finally....

Check it out!

Get Bent With A Curvy Volt-10
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post #648 of 649 Old Yesterday, 08:34 PM
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Not sure if this the right place but here goes

I bought some wall plates with speaker binding posts and I can't seem to get sound now. I've tried banana into the front and out of the back of the plate as well as bare wire out of the back of the plate. No sound at all, any ideas ?
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post #649 of 649 Old Yesterday, 08:43 PM
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I applaud you for the cable management...you sir are clean.
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