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***Working Man's DIY Dedicated Home Theater*** - Page 7

post #181 of 610
Thread Starter 
You down ETC yeah you know me!.......
post #182 of 610
Who's down with ETC? (Every last homie.)

Ahh...good times...
post #183 of 610
Quote:
Originally Posted by NicksHitachi View Post

Yup I'm sure there is room for improvement with chunks over the 4"thick panels I'm using. However until I fully treat the room with the full complement of panels I really couldn't afford to burn as much OC703 as it takes to do "chunks." So far I only have two packs of OC703 applied to the room, probably need two more at least not including "super chunk" corners.

I've also got an idea for some deep bass traps as I don't think I'll be able to soak it all up broadband before over treating the room. Those are gonna be a design of my own which incorperates diffusion and deep bass trapping not absorption. No sneak peak on those yet they're still pen marks on a napkin.....

I used roxul 60 which is comparable in specs to OC703 but a fraction of the cost. Apparently regular fluffy insulation works well for thick traps like superchunks.
post #184 of 610
Thread Starter 
Quote:
Originally Posted by manthatsnice View Post

Who's down with ETC? (Every last homie.)

Ahh...good times...

I wondered if anyone would feel me! Woot!
post #185 of 610
Thread Starter 
Quote:
Originally Posted by stockmonkey2000 View Post


I used roxul 60 which is comparable in specs to OC703 but a fraction of the cost. Apparently regular fluffy insulation works well for thick traps like superchunks.

I hear ya!

I have a spi real close and dont think they carry the Roxul....

Last pricing i got was $55 for 2"x2'x4'x6pcs of OC 703.....

I aint studying the fluffy pink and I aint drank localhost's koolaid on it being better than OC703...... Just sayin.
post #186 of 610
I agree with you on the fluffy pink - but that seems to be the prevailing wisdom at gearslutz.com. It all seems to be based on that gas flow resistivity calculator. It does not make intuitive sense to me that pink fluffy would work as well but then again some things are not intuitive at all.

I think I paid $45 or so for a bundle of 12 Roxul 60 and paid around $30 for 12 2x4 of the Roxul Acoustical Fire Batt. I'm using the AFB in my soffit for bass trapping. I noticed a huge difference when I added 4 bass traps with the roxul.

Fingers crossed that your thread does not turn into a huge debate on the pink fluffy. If so I apologize in advance.
post #187 of 610
Pink stuff......pink stuff......pink stuff......pink stuff......pink stuff.....pink stuff........Did I say pink stuff?

Gotta love the pink stuff.

Oh, wait a minute....hmmmmmm...oh never mind I was thinking of the pink stuff.

Regards,

RTROSE
post #188 of 610
Thread Starter 
Quote:
Originally Posted by RTROSE View Post

Pink stuff......pink stuff......pink stuff......pink stuff......pink stuff.....pink stuff........Did I say pink stuff?

Gotta love the pink stuff.

Oh, wait a minute....hmmmmmm...oh never mind I was thinking of the pink stuff.

Regards,

RTROSE

I reallllllllly like this guy...... Dude you rock!!!!

Without further adieu.....


Oh pooo I hate when the links don't work... here.

http://www.youtube.com/watch?v=RLRLhV9U0kQ
post #189 of 610
Ah, did I say I really love the pink stuff? Dude YOU rock! I love Aerosmith and "Pink" as well. Classic band, classic music. Much better than the crap my 14 year old listens to. But I digress.

Oh and here is a teachable moment here is how you insert the youtube link.

This is what you get when you click the Youtube tab [ youtube youtube] now insert the link like this http://youtu.be/h3Yrhv33Zb8 between the "tags" then delete everything EXCEPT the identifiers h3Yrhv33Zb8, this is what you will end up with.

[youtubeid h3Yrhv33Zb8 /youtubeid] but it will all be together no spaces and the other two brackets (would not let me do it with the closed in brackets) so the video shows up like this.




Consider yourself edumacated!

Regards,

RTROSE
post #190 of 610
Thread Starter 
Here's some fodder for those who like graphs....

I've moved the few treatments I have around recently and added some Deco-fusersTM to the rear of my space. Since then I havent had time to re-EQ the subs and adjust phase levels etc. So here is what Audyssey gives me right out the box....



Here is after 3-bands of EQ:



Total FR



Waterfall:



Decay


LL
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post #191 of 610
Wow,

Those sure are some purdy graphs.

Regards,

RTROSE
post #192 of 610
Nick,

I second what RT is saying. Purdy!!
Especially that spectrogram decay graph - was that done with REW?

Curious how you determined your noise floor is at 45 db? I have been thinking about that measurement, perhaps as simple as running an REW Sweep with no drive signal going into your AVR (in other words REW is just using a sweep to listen/capture only)?
post #193 of 610
Thread Starter 
Quote:
Originally Posted by RTROSE View Post

Wow,

Those sure are some purdy graphs.

Regards,

RTROSE

Thanks RT!

This is what we find ourselves doing when our build fund gets low.....

Well that and the more i use this measurement stuff the more I learn.
post #194 of 610
Thread Starter 
Quote:
Originally Posted by cuzed2 View Post

Nick,

I second what RT is saying. Purdy!!
Especially that spectrogram decay graph - was that done with REW?

Curious how you determined your noise floor is at 45 db? I have been thinking about that measurement, perhaps as simple as running an REW Sweep with no drive signal going into your AVR (in other words REW is just using a sweep to listen/capture only)?

Yeah its in REW too it generates for a measurement like the waterfall would. It can help you key in on areas of high sustain.

I determined the floor of the room using the spl function of REW. Just turn it on with projector amps etc running and see how many dbs your measuring with no content playing.

Mine runs high for a couple reasons: My PS3 fat is loud, i use 6 120mm pc cooling fans to cool the rack, and the previous owner of my EP4000 put a 12v fan in instead of 24v which causes it to spin twice as fast as it should which is louder! All this is 6-8ft to listening position.

If i look at waterfall below noise floor i might see the humm of the equipment as a ring simce its humming along at a specific frequency it would look exactly like a long sustained ring.

Preshate the interest boys!
post #195 of 610
Nick - thanks for the additional REW tricks.
Will be interesting to see where my background "floor" comes in - I have a QSC subwoofer amp w/fan, that will be a contributor...
post #196 of 610
Thread Starter 
Quote:
Originally Posted by cuzed2 View Post

Nick - thanks for the additional REW tricks.
Will be interesting to see where my background "floor" comes in - I have a QSC subwoofer amp w/fan, that will be a contributor...

No prob cuz im keeping time with your thread too and cant wait to add some o those deep bass traps since as you can tell i need in here......
post #197 of 610
In my last theater, my EP4000 was in the room with me and the fan was annoying. I put a 8" by 19" piece of roxul behind the amp and it did help to cut the noise down. I could still hear it but it cut some of the whine down. I later did the fan mod which quieted the amp down a lot. If you have some scraps of OC703 left you might want to give that a try.
post #198 of 610
Thread Starter 
Quote:
Originally Posted by stockmonkey2000 View Post

In my last theater, my EP4000 was in the room with me and the fan was annoying. I put a 8" by 19" piece of roxul behind the amp and it did help to cut the noise down. I could still hear it but it cut some of the whine down. I later did the fan mod which quieted the amp down a lot. If you have some scraps of OC703 left you might want to give that a try.

Good idear, i need to replace that fan with the proper one but so many things to do!
post #199 of 610
Just saw this build in your signature in another thread... You've done a great job!
post #200 of 610
I read the thread yesterday, but I don't remember if you mentioned it: What microphone are you using with REW?

I just started looking into the program - and I currently have a Radio Shack Digital SPL meter, which I see can be used with REW and I also have the calibration microphone that came with my HK 635... I don't know if that can be used or not as I haven't downloaded the software yet.
post #201 of 610
Thread Starter 
Quote:
Originally Posted by PTAaron View Post

I read the thread yesterday, but I don't remember if you mentioned it: What microphone are you using with REW?

I just started looking into the program - and I currently have a Radio Shack Digital SPL meter, which I see can be used with REW and I also have the calibration microphone that came with my HK 635... I don't know if that can be used or not as I haven't downloaded the software yet.

PTAaron,

Thanks for the complement!

I use a cross spectrum EMM-6 its calibrated to 5hz and comes with its unique calibration file which you upload to REW.

My thread is sliw these days ive bought bedroom furniture and a secrional his year which put the theater on HOLD.

Thanks for the intereast and keep aboard!
post #202 of 610
Thread Starter 
No big projects right now, I'll be building a couple little doors for the attic accesses soon though. I finally got tired of having to switch on and off manually the EP4000 for my subs so PROJECT TIME!!!!


I've asked around about switching off pro gear with 12v triggers but most folks suggested switched outlet or outboard box. That is too bulky as my rack is already very crowded. So I came up with an internal solution for the EP4000. Basically I wired in a 12V relay after the main power switch and mounted a 1/8" jack to accept the 12v trigger on the back of the amp.

Bought supplies.

3.5mm jack and Relay and through hole board:




Removed this foam not real sure why its there..... Amp fan runs much quieter and slower with it out......



Shot of relay after switch with 12v trigger current coming in on the twisted blue white pair.




Nice finished look. The way it should have come from the factory.




The relay mod works well, I did have to adjust my trigger delay for the amp to keep away the dreaded thud when all the other gear powers up but that was a simple setting in the projector.

I'll never have to flip the amp switch again unless I want to and that is worth the time it took to disassemble the rack do the mod and put it back together.

Total cost... about $10 for the 1/8" jack, relay, and board. The rest I already had but it did take about 4hrs.....
post #203 of 610
That's a sweet mod, Nick! Well done! That's true Maker spirit.
post #204 of 610
Thread Starter 
Quote:
Originally Posted by jdanforth View Post

That's a sweet mod, Nick! Well done! That's true Maker spirit.

Thank you kind sir!

How was/is the maker's fair? Was the danforth digitrolla entered?

*****tiptoes over to the "waffle wall theater build" to see whats up*****
post #205 of 610
Thread Starter 
Did a little work with subwoofage today.

Writeup later, but a few teaser pics to see if anyones paying attention!!!!

While my ears stop ringing......

Pop quiz what does an attic access point work great as?.........
LL
LL
post #206 of 610
IB!

Some little birdies are watching!
post #207 of 610
Niiice

Is that a 21" Maelstrom-X?
post #208 of 610
Quote:
Originally Posted by NicksHitachi View Post

Did a little work with subwoofage today.

Writeup later, but a few teaser pics to see if anyones paying attention!!!!

While my ears stop ringing......

Pop quiz what does an attic access point work great as?.........

Holy ka-moly! NICE! IB into your attic? Clever!
post #209 of 610
Thread Starter 
...
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post #210 of 610
Wow,

That should work fantastic! Awesome. Should really rock your space for sure.

Looking forward to hearing what your impressions are.

Regards,

RTROSE
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