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***Working Man's DIY Dedicated Home Theater*** - Page 20

post #571 of 604
Thread Starter 
Well keep in mind what the goals are for the baffle wall.

For me the goals were:

-Eliminate or mitigate SBIR off the front wall(Allison Effect)
-Maintain constant or controlled directivity down to crossover(~80Hz)
-Help speakers midbass sensitivity with ~6db boost below baffle step frequency of speaker.

A full complete baffle wall introduces its own issues:

-No effective bass trapping on front wall since all treatments are flush on wall.
-Cannot hide subs behind solid wall.
-Cannot hide Bass Traps behind solid wall
-Now front corners of room are Actually in room.
-Loss of room size

So for mine I used 4-4x4 panels of 3/4 MDF which leaves 2' along the bottom open and 2' along the top open. However those spaces are filled with 4"Roxul SafenSound. Therefore any omnidirectional energy that might spill around the baffle panels should be attenuated sufficiently, certainly -20db after passing through 4"Roxul spaced 2' off the wall twice.....

With this approach i can keep my subs and corner super chunks behind the screen Hidden.
post #572 of 604
Thread Starter 
No progress on further acoustic treatment. My router failed and I have to have it repaired so that puts off the acoustic treatment work for a bit.

I did pickup another EP4000 to double the sub power, a minidsp for Sub EQ, and a few more MFW woofers FO MO BASS! biggrin.gif
post #573 of 604
What kind of router ?
post #574 of 604
Quote:
Originally Posted by NicksHitachi View Post

......
I did pickup another EP4000 to double the sub power, a minidsp for Sub EQ, and a few more MFW woofers FO MO BASS! biggrin.gif

That's what i'm talking about! You see all these threads with people doing sub crawls and dragging subs around the room. Just skip all that and ADD MORE WOOFERS! I like it smile.gif

Sorry to hear about the router. Is it old enough for this to be an expected sort of failure? Is it just the switch, or something more serious?
post #575 of 604
Thread Starter 
Quote:
Originally Posted by Ant52hony View Post

The heights would have to be way lower than spec and closer to the center.

You lost me(easy to do)

Quote:
Originally Posted by Mfusick View Post

What kind of router ?

Porter Cable about 2yrs old. They agreed to fix it, i just gotta drop it off at the local repair shop.

Quote:
Originally Posted by J_P_A View Post

Quote:
Originally Posted by NicksHitachi View Post

......
I did pickup another EP4000 to double the sub power, a minidsp for Sub EQ, and a few more MFW woofers FO MO BASS! biggrin.gif

That's what i'm talking about! You see all these threads with people doing sub crawls and dragging subs around the room. Just skip all that and ADD MORE WOOFERS! I like it smile.gif

Sorry to hear about the router. Is it old enough for this to be an expected sort of failure? Is it just the switch, or something more serious?

LOL, once they are all built out, im gonna go with one in every corner or every mid-wall. Then the "remainder" Ill just hide behind the screen wall. biggrin.gif
post #576 of 604
Thread Starter 
Im BAD.

post #577 of 604
Is that yours???

Tim
post #578 of 604
Thread Starter 
Ha I wish!

I contracted a guy to plunge all the holes needed to make some BAD diffusers for the theater. 4- 4x8 sheets or 16 2x4s whichever i decide to use....

Im working out a design in my head that does not cover the BAD grating and possibly uses the grating in a poly shape over a Broadband Absorber.
post #579 of 604
Thread Starter 
post #580 of 604
Awesome!
post #581 of 604
Looking good.. anxious to see what you have planned. The exposed diffuser will look awesome.

Tim
post #582 of 604
Thread Starter 
UPDATE: The CNC guy told me it would take less than an hour to machine all the panels......

8hrs later the CNC finished! eek.gif He still honored his quote though but i made him take some extra money. Im pretty sure his bit will need sharpening.

The panels look good, im still working out how to use them though.

After some research it seems they reflect or glare at high incidence angles. To combat this some recommend curving them into a poly.

I hope to be able to curve these in a poly shape over broadband panels which should be a pretty balanced treatment. That way i can apply as many as needed without worrying about killing all the HF energy.
post #583 of 604
I'm a little surprised it took that long. Cool that he honored his quote, and cool for you to give him some extra.
Quote:
Originally Posted by NicksHitachi View Post

........
After some research it seems they reflect or glare at high incidence angles. To combat this some recommend curving them into a poly......

I wonder if this is why Quest uses a rigid f.g. panel instead of hardboard?
post #584 of 604
Thread Starter 
Quote:
Originally Posted by J_P_A View Post

I'm a little surprised it took that long. Cool that he honored his quote, and cool for you to give him some extra.
Quote:
Originally Posted by NicksHitachi View Post

........
After some research it seems they reflect or glare at high incidence angles. To combat this some recommend curving them into a poly......

I wonder if this is why Quest uses a rigid f.g. panel instead of hardboard?

I think you might be right. If I was to replicate that design, I would likely have went to a metal machine shop and had them laser cut the high density fiberglass.... The perfsorbers seem a little too complicated for me and I think the DIY results would likely be more variable.

Quote:
Originally Posted by Mr.Tim View Post

Looking good.. anxious to see what you have planned. The exposed diffuser will look awesome.

Tim

Thanks Tim!

Here is a terrible rendering of what I want them to look like:

Disregard the colors that was just to give some contrast

post #585 of 604
Holy Masonite Batman!!!

Lookin Good Nick, excited to see them on the wall.

8hrs is understandable , considering ~4000 holes per sheet, thats only a little over 7 sec per hole through 4 layers..

Much faster than the alternative rolleyes.gif



On a side note, the binary pattern on the perfsorbers (the originals at least) were cut using a water jet. A laser (besides producing toxic fumes from the fiberglass)could be likely to "cauterize" the holes. not sure how that may or may not impact the characteristics.

The feedback for the time required to drill your "Bad" panels (however different for the quest products) does provide some insight however to the cost considerations of the perfsorber product. Its easy to over look the shear number of holes and associated manufacturing time in the large panels. I'll bet this was a major driver for the change to the Q-perf.

Brad
post #586 of 604
Any updates? I just went through your thread and you have done a great job!
post #587 of 604
Thread Starter 
Hey PI, Thanks for the compliments!

I have been working on my panel design. I have a prototype 75% complete.

However, the masonite is just too stiff to bend into the polys like i wanted. Im going to have to settle for the bad panels flat on the fronts of the panels. The bad panels will be removable so that if i need to switch the panel back to a full BB absorber i can just remove the BAD perf panel over the absorber....

This is what has contributed to the lengthy design/prototype stage.

Maybe i can get some pics and put them up this weekend but there is not much to show until the prototype is complete...

Also, i sold some speakers so now im back to a measly 7.7..... smile.gif
post #588 of 604
cant't wait to see your panels. Looks like you are going to have to build some more speakers now that you sold two of them.
post #589 of 604
Quote:
Originally Posted by NicksHitachi View Post

Hey PI, Thanks for the compliments!

I have been working on my panel design. I have a prototype 75% complete.

However, the masonite is just too stiff to bend into the polys like i wanted. Im going to have to settle for the bad panels flat on the fronts of the panels. The bad panels will be removable so that if i need to switch the panel back to a full BB absorber i can just remove the BAD perf panel over the absorber....

This is what has contributed to the lengthy design/prototype stage.

Maybe i can get some pics and put them up this weekend but there is not much to show until the prototype is complete...

Also, i sold some speakers so now im back to a measly 7.7..... smile.gif

Nick,
Back to a measly 7.7, Whaaaat?
post #590 of 604
Thread Starter 
Hey Cuz,

Yeah i was running DSX wides(9channels) and really liked them... I did some switching back and forth and "thought" it sounded better with the wides. My room is very narrow so widening the sound stage seemed to work well for me.

However i found a local buyer for the speakers and had to let them go.
post #591 of 604
Nick,

Now that I have the 4311; I am toying with height or wide speakers. Height speakers would be easy to incorporate in my setup, wides a bit more difficult. Curious if you also tried height speakers?
post #592 of 604
Thread Starter 
Quote:
Originally Posted by cuzed2 View Post

Nick,

Now that I have the 4311; I am toying with height or wide speakers. Height speakers would be easy to incorporate in my setup, wides a bit more difficult. Curious if you also tried height speakers?

Hi Ed,

I did toy with heights a little. Admittedly i didnt spend much time with them as my listening impressions were that the wides added more to my setup. However I do think that this might be partially due to my narrow room, IDK.

The heights did add to the stage but i felt the added energy on the sides worked better. It almost plugged some of the gap between the mains and the surrounds. I think in a perfect world i might use both but my processor would only do either/or.

Ive been living wihout the wides for a couple weeks now and dont notice the speakers are gone during movie playback per say, but i did notice that i liked the sound better when i did A B comparison.

The DSX wides just energized the room more. This has made me a strong believer in preserving late arrival attenuated reflection energy in the room. My room has a good bit of absorption and a carpet floor. Further treatments will be combination reflectors-diffusors and i intend to face a lot of my current treatments with membranes and observe how that affects the room energy.

No work this weekend though, ITS MY BIRTHDAY WEEKEND, woot!
post #593 of 604
Nick,
Interesting observations with reflections, and treatments, and a Happy Birthday to You!
post #594 of 604
+1 Happy birthday!
post #595 of 604
Thread Starter 
Thanks for the birthday wishes guys!

I havent had free time to work on the acoustic treatments..... BUT


I did finalize and purchase the hardware for my HTPC/server/RAID. This stuff should be here this week and I'm gonna need plenty of help since I've never built a PC before. My biggest tasks have been removing and installing RAM or HDDs eek.gif

Heres a list of the Hardware. I intend to use it to do Media Browser, Rip Blue Rays for temporary storage, Music Server, Video Server, Photo dump, DVR OTA signals and hopefully cut the chord, etc.

HTPC.pdf 204k .pdf file
post #596 of 604
What type of raid server are you going to build? I am assuming the ss hard drive is for the OS and the 3TB hard drives are for a parity drive and a data drive?
post #597 of 604
Thread Starter 
Quote:
Originally Posted by Pain Infliction View Post

What type of raid server are you going to build? I am assuming the ss hard drive is for the OS and the 3TB hard drives are for a parity drive and a data drive?


I'm still very green on all the RAID stuff but yes I think what your saying is my intent. I hope to use some freeware to achieve some redundancy for my data.

I know 3TB will get eat up quickly with BR rips but I dont intend to keep a large library. The case can hold several more hard drives so I will add some more at some point.
post #598 of 604
If you need some help let me know. Mfusik helped me out on my raid build so I can return the favor to the community. I ended up with flexraid after researching for months. I am very glad I did and love knowing that all my data is backed up and healthy every day because my server sends me emails telling me all is well. I highly recommend looking into flexraid. If one of you hard drives crashes, just stick in another and it will restore all of you information on its own. Easy peasy.

There is no mirroring and wasting hard drives like other raid systems either, so it is also a cheaper way to go.
post #599 of 604
Thread Starter 
Got started today cutting wood for my final stage of acoustic treatments:







post #600 of 604
Thread Starter 
Minor update and design change rolleyes.gif


After fully building a prototype I have decided that it looks better to have the diffusion grating behind the burlap. I was not able to make an applique that didn't just look tacky over the burlap. If I were going to do it again I would use appearance grade lumber and paint the frame and have it all have a hard look except the holes and absorption behind.

Also the brown inside the holes was more noticeable than I anticipated and I'm not painting 2,500 holes per 4X8 sheet. eek.gifeek.gifeek.gif

I'll just have to accept that the diffusion is not on display for the side panels. The Ceiling is still an option though I might look into a hard option for the ceiling we shall see. cool.gif

On a side note I found a material that works great for backing on acoustic treatments. Landscape cloth works great! It has excellent tensile strength and contains the fibers nicely. While not cheap I had a lot of this leftover from my last outdoor project. It really gives a pretty professional look for the backs.

NEVERMIND MY UPHOLSTERY SKILLS OR LACK THEREOF!!!

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