Home Theater Systems - Electronics and Forum - HomeTheaterShack - Home Audio Acoustics http://www.hometheatershack.com/forums/ Home Audio Acoustics includes discussion of acoustical treatment for your home theater room. Acoustics is one of the most important aspects of building the best sounding home theater. Get advise from our resident experts. This forum is currently sponsored by GIK Acoustics. Moderators: bpape, Glenn Kuras, Ted White en Fri, 20 Nov 2009 23:32:16 GMT vBulletin 60 http://www.hometheatershack.com/forums/images/misc/rss.jpg Home Theater Systems - Electronics and Forum - HomeTheaterShack - Home Audio Acoustics http://www.hometheatershack.com/forums/ Horns and acoustic treatments http://www.hometheatershack.com/forums/home-audio-acoustics/22928-horns-acoustic-treatments.html Mon, 16 Nov 2009 07:29:26 GMT I'm in the process of getting some hornloaded speakers for my theater (Klipsch THX Ultra2).

I've read alot about setting these up, and acoustic treatments is often mentioned. Now, I have conventional speakers and conventional FRP treatments (and more).

How is treatments different with traditional speakers and horns? ]]> Home Audio Acoustics atledreier http://www.hometheatershack.com/forums/home-audio-acoustics/22928-horns-acoustic-treatments.html Listening room: Problems/Solutions Acoustics http://www.hometheatershack.com/forums/home-audio-acoustics/22914-listening-room-problems-solutions-acoustics.html Sun, 15 Nov 2009 22:37:51 GMT Hi, I use my bedroom as listening room. The first time I instaled my speakers and played some music I found some... Hi,

I use my bedroom as listening room. The first time I instaled my speakers and played some music I found some problems.
- Weak and distorted stereo image.
- Painful medium high and high response.
- Huge modal problems.
- Flutter echo between rear and front wall.
- Hard comb-filtering.

So, I measured it.
I found peaks at 55hz, 93hz, 137hz and dips at 82hz and 210hz.

Once I don't have much practical experience in acoustic treatment I'm going to need your help to solve this problems.

When listening to music the worst and more notable problem is the 55hz peak. So I'm thinking to invest or to try building something like those RPG Modex tuned bass traps, they have a really high Q and are very effective dumping the frequency they are designed for. I don't know if it is the best solution, but I know it works.
However, I can't build a tuned bass trap for every problematic frequency. So I need a acoustic solution to smooth all the bass reponse, it's impossible to get it flat, but at least smooth all those dips and peaks.

All the others problems I think it's possible to solve using aborption on the walls. Medium and high problems destroy my stereo image so maybe some rockwool panels in walls and roof may solve it. Some people advised me to use diffusers on the speakers axis which make sense for me.

Two graphs in attachments

Hope to get some help!

Thanks in advace
(Sorry for my english :neener:)
Attachments
  
]]> Home Audio Acoustics Metallising http://www.hometheatershack.com/forums/home-audio-acoustics/22914-listening-room-problems-solutions-acoustics.html Will diffusers work here? http://www.hometheatershack.com/forums/home-audio-acoustics/22900-will-diffusers-work-here.html Sun, 15 Nov 2009 13:32:49 GMT Hmmm. Diffuser og diffusor? Well, you know what I mean.

I don't have much distance from couch to backwall. Approximately 6 feet from ear to wall. The backwall is also asymmetrical as you can see in the picture. My question is if it's worth placing diffusers here. I'm thinking higher on the wall to create more distance. On the ceiling or on the triangular windows. The problem is of course that they will not be placed symmetrical. Will that create an unbalanced soundstage?
Attachments
 
]]> Home Audio Acoustics omholt http://www.hometheatershack.com/forums/home-audio-acoustics/22900-will-diffusers-work-here.html DIY basstraps http://www.hometheatershack.com/forums/home-audio-acoustics/22868-diy-basstraps.html Fri, 13 Nov 2009 21:14:38 GMT Hi guys. I start to build bass traps, this is what I have found to use as dampening material, the lowest of the curves are... Hi guys. I start to build bass traps, this is what I have found to use as dampening material, the lowest of the curves are for the "extra bass" with total depth of 200 mm.
Attachment 17195

Attachment 17196
Attachments
  
]]> Home Audio Acoustics lglura http://www.hometheatershack.com/forums/home-audio-acoustics/22868-diy-basstraps.html Display case effect on reflections? http://www.hometheatershack.com/forums/home-audio-acoustics/22832-display-case-effect-reflections.html Fri, 13 Nov 2009 01:55:02 GMT I've put 2 acrylic box display cases,one smaller than the other for 2 of my movie statues behind me on top of an armoire.The smaller case measures 18"Hx10"Dx10"W and the larger 17"Hx14"Dx14"W.The top of the armoire is 4" inches above seated ear height and the face of it is 4' feet behind me against the rear wall.

If I position the cases so that they face like diamonds with the corners straight forward instead of square with the flat sides forward will the cases help break up the reflections that hit them or will this arrangement make the reflections more complex and problematic? ]]> Home Audio Acoustics Drudge http://www.hometheatershack.com/forums/home-audio-acoustics/22832-display-case-effect-reflections.html I have NO BASS. Help me before I go mad! http://www.hometheatershack.com/forums/home-audio-acoustics/22823-i-have-no-bass-help-me-before-i-go-mad.html Thu, 12 Nov 2009 21:49:03 GMT Hey all,

I'm almost finished setting up my home theatre.

The room is 4.4m wide by 5.4m long.

In a nutshell... I have no bass at the seating position. Nothing. Registering very little from about 60Hz down to about 30Hz. See my rather crude diagram of my bass response below.

Before you ask. Yes, I have tried the sub woofer(s) in every location around the edges of the room, and also in a bunch of random non symmetrical positions (ie: one at the front left, one at the back middle). To no avail. I even placed the sub at the seating position and crawled around the room.... I found a couple of spots with average bass... placed the subs there, and still little to nothing at the seating position.

It's driving me mad, and I'm getting extremely frustrated.

Before I go and start building some super chunks. I need to know, will bass trapping actually help my situation? I don't really want to move my seats to the back of the room, as I'll lose my surround field. I just want that pressurised bass sound at the seating position. Is that too much to ask? The floor vibrates, but that's not important to me!! LOL.

If anyone has any suggestions, it would be greatly appreciated... as at the moment this is turning what could be an amazing HT into one that sounds cold and empty :(

Many thanks in advance.

Scott
Attachments
 
]]> Home Audio Acoustics scottrichardson http://www.hometheatershack.com/forums/home-audio-acoustics/22823-i-have-no-bass-help-me-before-i-go-mad.html New wall and front wall http://www.hometheatershack.com/forums/home-audio-acoustics/22733-new-wall-front-wall.html Tue, 10 Nov 2009 10:59:41 GMT I am closing off my HT room with an interior wall and have a couple of questions. 1. The new interior wall is 20 Ft.... I am closing off my HT room with an interior wall and have a couple of questions.

1. The new interior wall is 20 Ft. Should I add any insulation inside the wall? I live alone so am not concerned with sound leaking. Is there any acoustical advantage to putting some in there?
Edit: I did some more searching and it seems that I do not need to insulate the wall if I don't care about keeping the sound in.

2. From what I have read here the front wall should be completely treated. Is there an inexpensive way to do this? The room will be 11 ft. wide when the wall is finished. I would rather not glue anything to the wall if I don't have to. All corners will have bass traps, the back wall will have probably two 6" bass traps, and I will have two 2" panels on each wall and ceiling for first reflection. Treating the whole front wall with panels would add a significant expense.

Thanks
Moto ]]> Home Audio Acoustics MX48 http://www.hometheatershack.com/forums/home-audio-acoustics/22733-new-wall-front-wall.html Tame Mid-Room Null? http://www.hometheatershack.com/forums/home-audio-acoustics/22664-tame-mid-room-null.html Sat, 07 Nov 2009 21:16:25 GMT Well, after months of lurking, research and construction, I am finally posting! I have completed our HT (Ha!) and now in... Well, after months of lurking, research and construction, I am finally posting! I have completed our HT (Ha!) and now in the process of tweaking. The never-ending process. I have written a thesis here to enlist the best in the arena of HT set-up...the Shacksters. Please forgive the long post, but I wanted to cover as many HT factors as necessary for you guys to suggest a plausible solution.

Feel free to comment on any aspect of construction taht may need improvement, but my main complaint is the bass null in the front row seating. I have also reached out to GIK and RealTraps for possible solution.

First of all, thanks for everyone's posts in the spirit of DIY and product guidance. I have been a DIY guy to this point, but have reached an impasse and would like to know if anyone can suggest an improved configuration or product that can fix my problem.

The HT is a 2-row seating arrangement, and the front row has a HORRIBLE null at most practical bass frequencies in music and movies. This is due to the mid-placement of the front row, but cannot be changed due to room layout, screen distance, legroom etc. My room is dedicated HT 12’x17’x10’ with a sloped/flat reflective ceiling and absorptive carpet floor.

For EQ, I am using a RS SPL meter and a spreadsheet, 1/6 octaves test tones, 16-160Hz, played on the Okyo DPT-1. The Oppo BD83 had trouble with the track splits on the burned test tone CD.

I began EQ with a parametric sub-amp that allows one cut/boost, and the AVR which allows another at set frequencies (40Hz being the only usable one). I was trying to decide if a BFD would help and discovered that I have much bigger problems.

My brother proclaiming “it needs more bass!” from the front row during a movie, while I was being bass-massaged in the back, did not settle well with me either.

The sub is slightly off the screen wall and 1/3 from the corner. I tried lateral 2/7 with reduced front seating output; 3/7 is not feasible placement. 7” off the wall was better than 3”; 12” was worse. I also tried side-wall, fore of the front row, but that also reduced output. No other sub-placement is really feasible due to the small room layout.
-Sub-amp X-over is ~90Hz, mains are set "small" in the AVR
-AVR X-over is set at 80Hz
-Sub-amp is reduced -2dB at 18Hz, 1/6 octave BW to reduce clipping in bass intensive explosion scenes. Gain is at 0.5.
-AVR amp is set at -2 at 40Hz as a result of measurements in the back row, and +1 at 80Hz to help the X-over dip. Raising the 40Hz range helps mitigate the null attenuation in the front row, but causes overwhelming increases in the back row.

I may remove that 18Hz cut and reduce the amp gain to prevent clipping, but right now the front lacks so much that I was compelled to turn up the gain and cut the sub-sonic for the benefit of the “audible” frequencies.

Walls are ½” + 5/8” sheetrock with 60oz GG per sheet, on 16” centers. Ceiling is the same except on 24” centers. All are covered in very heavy “mud” texture.

Floors are second story wood sub-floor with 1/8” polyethylene underlayment beneath 1/8” MLV with padding and carpet.

There are curtains in the screen-wall corners behind the mains, and soon there will be parted curtains mid side-walls for appearance and some first reflection absorption. Back walls are empty for now, with good mix of reflection/diffraction due to the heavy texture.

I have a 8’x10’x8”riser along the back wall that has the top-back 9” of deck open, and filled with 50% ultra-touch for the purpose of adding some bass trapping. No additional holes or ports. Measurements open and covered show that this does not make a difference, concluding that a small riser-trap is ineffective (except to raise the back row;). I did use GG between the deck ply and MDF layers, attached on 16” centers.

My trapping consists of front corner super-chunks of the R21 UltraTouch, 23” across the face, floor to ceiling, covered with 1mil plastic. No trapping exists in the back corners where the tremendous bass lives, and I am not undertaking any more construction in the room.

Bass Measurements in trouble:
20Hz: FrontRow 76dB; BackRow 78dB (OK)
25Hz: FrontRow 90dB; BackRow 95dB
28: 91; 100
31.5: 92; 106
36: 82; 104
40: 86; 102
45: 95; 96
50: 94; 91
56: 93; 100
63: 98; 101
71: 97; 100
80: 90; 88
89: 80;91
100: 88; 87
111: 92; 84
125: 81; 65

WTH??

So, how do I fix this? Will Monster Bass Traps or Mondo Traps in the one available back corner help the 25 to 56Hz range? Will 2 stacked make an improvement?

There are French entry doors in the other back corner that preclude traps there, so I am left with only one more available wall-wall corner to treat.

I am also considering bass-shakers of the musical variety to bridge the bass gap in front. I do not want anything overwhelming since I will also be listening to music in this room, probably from the front row due to proximity of the AVR and disc player.

Components:
AVR: Onkyo DTR6.5
BD: Oppo BD83
DVD: DPT1
Mains: Paradigm Studio 80's
Sub: Velo F-1500, re-edged and re-amped
Note: I tried a spare SVS PB12-plus with no benefit. However, it did exhibit unacceptable port chuffing in the low frequencies that I never noticed before.
Sub-Amp: Dayton HPSA1000
Center: Paradigm CC350
Surrounds: Paradigm ADP190
Projector: 6500UB with latest FW..."low" FI is awesome now
Screen: 92" diag DaLite DaMat...perfect for the room and 12' throw
Dark brown walls, dark wood trim, black curtains, dark brown faux leather media couches (2x3 seats with cup/storage consoles between seats and leg rests), medieval and Gothic art.

Best Regards,
Brad Minter
HT Enthusiast ]]> Home Audio Acoustics minterbrad http://www.hometheatershack.com/forums/home-audio-acoustics/22664-tame-mid-room-null.html flooring and carpet http://www.hometheatershack.com/forums/home-audio-acoustics/22609-flooring-carpet.html Fri, 06 Nov 2009 02:29:13 GMT I am getting ready to redo the flooring in my listening room. This room is for 2 channel only - no home theater. Currently... I am getting ready to redo the flooring in my listening room. This room is for 2 channel only - no home theater. Currently I have wall to wall carpet on a very squeaky floor - my cat can't even walk in without being noticed. I plan in screwing the floor down better before re-carpeting. I am also thinking of putting down another layer of ply wood to stiffen up the floor.
I am looking for suggestions on installation, rug type, padding type and thickness, wall to wall, area rug, etc..
Would a live end in the front be the way to go?
My room is 13.5 x 16.5 long x 10 high. The speakers are setup along the short wall. I have bass traps in three corners, and absorption at the first reflection point on the ceiling and side walls. The back wall has a combination of absorption and diffusion.

John ]]> Home Audio Acoustics jpv http://www.hometheatershack.com/forums/home-audio-acoustics/22609-flooring-carpet.html Do clips, GG, DD make a difference inside the room? http://www.hometheatershack.com/forums/home-audio-acoustics/22592-do-clips-gg-dd-make-difference-inside-room.html Thu, 05 Nov 2009 16:08:47 GMT Just as the thread title states, do Whisper Clips, Green Glue, double drywall, etc. make a difference inside the room or are... Just as the thread title states, do Whisper Clips, Green Glue, double drywall, etc. make a difference inside the room or are they used merely to limit sound transmission through walls? I understand that the addition will reduce incoming noise, but if I have a perfectly quiet house it won't make a difference, right? On the flip side, the addition will reduce outgoing noise from the HT as well, but if I'm the only one home it doesn't matter, right? Reason I ask is I'm trying to calculate the cost of building a new HT and all the articles I read about soundproofing is to eliminate the transmission of it and nothing is mentioned of improving sound quality within the room so I would not want to spend ~$2k on clips, GG, and DD unnecessarily.

Thanks!

- still trying to figure it all out... :help: ]]> Home Audio Acoustics slow.junk http://www.hometheatershack.com/forums/home-audio-acoustics/22592-do-clips-gg-dd-make-difference-inside-room.html Memory foam http://www.hometheatershack.com/forums/home-audio-acoustics/22585-memory-foam.html Thu, 05 Nov 2009 12:06:10 GMT Anyone ever test memory foam to see how it works as a sound absorber? Anyone ever test memory foam to see how it works as a sound absorber? ]]> Home Audio Acoustics realtor416 http://www.hometheatershack.com/forums/home-audio-acoustics/22585-memory-foam.html Room Response Calculator http://www.hometheatershack.com/forums/home-audio-acoustics/22579-room-response-calculator.html Thu, 05 Nov 2009 08:51:13 GMT Hi, has anyone used the room response calculator room060d.exe to examine their rooms response? thanks Murray Hi,

has anyone used the room response calculator room060d.exe to examine their rooms response?

thanks

Murray ]]> Home Audio Acoustics Mr X http://www.hometheatershack.com/forums/home-audio-acoustics/22579-room-response-calculator.html GIK ArtPanel Giveaway http://www.hometheatershack.com/forums/home-audio-acoustics/22350-gik-artpanel-giveaway.html Sun, 01 Nov 2009 19:29:50 GMT http://www.gikacoustics.com/images/art_panel_500.jpgHome Theater Shack and GIK Acoustics are teaming up to give away the...
Home Theater Shack and GIK Acoustics are teaming up to give away the ArtPanels you see in the photo to the left and a lucky member of the Shack is going to get to hang these in their very own home theater room!


Qualifications

The qualification period is from November 1, 2009 until January 31, 2010... with the drawing being held the first week of February 2010!
Qualifying members must be registered by January 15, 2010 in order to qualify.

You must have a total post count of at least 10 posts in the forums.

Post in the GIK ArtPanel Giveaway Qualification Thread that you would like to be entered into the drawing.

Winner will agree to post pictures of the ArtPanels mounted in their room in the Home Audio Acoustics forum.

Make sure your equipment is listed in the Home Theater Equipment forum.

Shipping will be taken care of for CONUS Lower 48 addresses, otherwise the winner will be responsible for shipping.

NOTE: Qualifying members must be registered by January 15, 2010 in order to qualify.

Qualifications are subject to amendment with notice posted here.



Good luck! ]]> Home Audio Acoustics Sonnie http://www.hometheatershack.com/forums/home-audio-acoustics/22350-gik-artpanel-giveaway.html GIK ArtPanel Giveaway Qualification Thread http://www.hometheatershack.com/forums/home-audio-acoustics/22349-gik-artpanel-giveaway-qualification-thread.html Sun, 01 Nov 2009 19:27:12 GMT http://www.gikacoustics.com/images/art_panel_500.jpgHome Theater Shack and GIK Acoustics are teaming up to give away the...
Home Theater Shack and GIK Acoustics are teaming up to give away the ArtPanels you see in the photo to the left and a lucky member of the Shack is going to get to hang these in their very own home theater room!


Qualifications

The qualification period is from November 1, 2009 until January 31, 2010... with the drawing being held the first week of February 2010!
Qualifying members must be registered by January 15, 2010 in order to qualify.

You must have a total post count of at least 10 posts in the forums.

Post in this qualification thread that you would like to be entered into the drawing.

Winner will agree to post pictures of the ArtPanels mounted in their room in the Home Audio Acoustics forum.

Make sure your equipment is listed in the Home Theater Equipment forum.

Shipping will be taken care of for CONUS Lower 48 addresses, otherwise the winner will be responsible for shipping.

NOTE: Qualifying members must be registered by January 15, 2010 in order to qualify.

Qualifications are subject to amendment with notice posted here.



Good luck!

---


DO NOT POST IN THIS THREAD UNTIL YOU HAVE QUALIFIED!

This is the qualification thread only... no discussion here... use the discussion thread... Thanks! ]]> Home Audio Acoustics Sonnie http://www.hometheatershack.com/forums/home-audio-acoustics/22349-gik-artpanel-giveaway-qualification-thread.html Acoustic panels http://www.hometheatershack.com/forums/home-audio-acoustics/22343-acoustic-panels.html Sun, 01 Nov 2009 16:36:26 GMT I finally finished the structure and I'm looking for advice on acoustic panels for the wall.I was thinking maybe three on each sidewall about 3 x4 ft. made out of a 2x2 frame cover it with fabric and fill it with
some type of sound absorbing material.Any suggestions on it or anything else to make it better?
Attachments
 
]]> Home Audio Acoustics realtor416 http://www.hometheatershack.com/forums/home-audio-acoustics/22343-acoustic-panels.html