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  • Help me attack my corners!

    About to start (finally) treating my room. Going DIY...
    Rear corner traps are gonna be the hardest for me as it is a pretty tight room & I don't want to "invade" it even more. And my wall mount surrounds make it even more difficult to fully treat the corners.

    Which of the above (EDIT: Well, below since I goofed up making a "poll") are likely to be most effective?
    As I have to treat in "steps", which would you start with?

    Pics not great, but will give you an idea of what I'm working with...
    Media & lighting will be moved/replaced...






    EDIT: Arghhh! Was gonna make this a "Poll" and accidentally skipped over "options" - then edit won't let me delete & start over...??? (No delete option???)

    SO: Here are the options -
    1. 2x2x6" Panels Straddling the corner/ceiling intersection
    2. "Smaller" super chunks above & below surround speakers
    3. Panels above, chunks below
    4. Other corner suggestions???
    5. Forget corners for now...just start w/ back wall & re-evaluate
    (I do plan 2, maybe 3, 2x2x4" panels on back wall)

  • #2
    First, those are not the only corners in the room, dont forget wall to ceiling and wall to floor can be treated as well.

    The advantage of a panel straddling a corner over super chunk is they take less material and are easier to make but only give up a little in effectiveness.

    The superchunk can be more effective and can blend in better. It might be easier to fit in a irregular shape as well.

    Honestly I think all 5 options will work, and since you are going DIY, 5 might be your best bet so you get a feel for the materials before you comit to the difficult part.

    Comment


    • #3
      Thanks as usual M...:salute:
      Started this "new thread" hoping others would chime in also:poke:

      ...Not that I don't value your opinion, of course :kissass: - unless your trashing the SEC:fryingpan::boom:
      OK, well, maybe we (SEC) are a "thuggy" bunch:embarass: Not so much AU thank gawd:sly:

      WAIT! Why am I :kissass: ??:tiny::raspberry:

      Oh well...
      I do have a concrete form that I was experimenting w/ a while back.
      What I tried was a bust:dizzy:
      But, I may try to cover it w/ rockwool & fill also - may try this in corners on floor
      (Cut it 2 - 2' tall sections):idea::scratchchin:

      If nothing it else, these would be easy to move around room to see if/where effective....
      And of course, friends will think I know what I'm doing:eyebrows:

      Comment


      • #4
        HUH?

        This space was intentially left blank

        Comment


        • #5
          Originally posted by m-fine
          HUH?
          what, the concrete form idea???? Have a 4'X12" form that I cut in half.
          I thought that if I filled it w/ some sort of poly "peanuts" then try to bind/fill w/ "Great Stuff" I could 1/4 cut, cover with rockwool & fabric, and place neatly into corners... Like a round faced wedge...
          The waxed interior wouldn't let Great Stuff bond, so I couldn't get a decent "column" shape....
          Anyway, may have been a strange idea, but it was fun trying...
          So, now I have the empty form - gonna make it into something along the lines of a "tube trap"...???:scratchchin:

          Comment


          • #6
            Uh no!

            The form will reflect way too much. To make a tube trap, you use rigid tube shaped fiberglass or mineral wool pipe insulation (for big pipes). Generally you would not put a tube trap in the corner since the spanning panel and superchunk are easier and more effective, but you could use the tube traps along the walls for both absorption and difusion.

            As for the concrete form, I would do one of two projects. Project 1, DIY tube sub. Project 2, Helmholtz resonator tuned bass trap. For option 2, you would measure your room and find the most offensive peak, and then design the trap to tune it like an in room PEQ. The concrete form and a couple ends would form the chamber and a PVC piece could be the neck. Fill it with the right amount of absorption to set the Q or width, then decorate to please the wife.

            Comment


            • #7
              Originally posted by rumonkey2
              what, the concrete form idea???? Have a 4'X12" form that I cut in half.
              I thought that if I filled it w/ some sort of poly "peanuts" then try to bind/fill w/ "Great Stuff" I could 1/4 cut, cover with rockwool & fabric, and place neatly into corners... Like a round faced wedge...
              The waxed interior wouldn't let Great Stuff bond, so I couldn't get a decent "column" shape....
              Anyway, may have been a strange idea, but it was fun trying...
              So, now I have the empty form - gonna make it into something along the lines of a "tube trap"...???:scratchchin:
              What you are describing is a helmholtz resonator style absorbtion device. The tube is filled with something like polyfil or fiberglass. The bottom is sealed and the port of correct length is put into a top plate. This is tuned to a specific frequency band where the room mode caused by the corners are bad. Not a wide bandwidth device but can be useful in certain applications.

              The ETF version 5.x software has the capability to design the helmholtz style of absorbers.
              Better living through Audio Nirvana!

              Comment


              • #8
                Originally posted by HAL
                What you are describing is a helmholtz resonator style absorbtion device. The tube is filled with something like polyfil or fiberglass. The bottom is sealed and the port of correct length is put into a top plate. This is tuned to a specific frequency band where the room mode caused by the corners are bad. Not a wide bandwidth device but can be useful in certain applications.

                The ETF version 5.x software has the capability to design the helmholtz style of absorbers.

                I THINK what he was trying to describe was a 1/4 circle, or pie shaped glob of poly peanuts and expanding foam to stick in the corners. The problem with that idea (besides the materials, did you get the idea for using great stuff from a 'bama grad?) is that the resulting piece would be way to small as a broad band absorber of bass frequencies. 12" diameter tube cut into quarters would only stick out 6" per wall, you want 18" to 24" if you can fit it.

                The Helmholtz would be a much better idea, but you need room measurements first, then build, measure, and tune. The concern is how was the tube cut in half? With 2 2'x12" tubes he could make a pair of nice resonators (they can look the same but be tuned to different peaks). If he cut it the other way and has 2 4' long half circles, I guess he could make decent broad band diffusers for the reflection points that would be effective down to about 300 hz.

                Comment


                • #9
                  Originally posted by rumonkey2
                  And of course, friends will think I know what I'm doing:eyebrows:
                  I missed this part! That is the key, as long as you have a bunch of funny looking abjects in the room and you tell people (with enough confidence) that they greatly improve the room accoustics, they will believe you and look up to you. I mean lets face it, you hang out with a bunch of fools who can not tell a bird of prey from a large carnivorous cat, so it is not like they are going to look at your room treatments and be able to deduce how effective they may or may not be!

                  [edit: test] [ = failed]

                  Comment


                  • #10
                    Originally posted by m-fine
                    Uh no!

                    The form will reflect way too much. To make a tube trap, you use rigid tube shaped fiberglass or mineral wool pipe insulation (for big pipes). Generally you would not put a tube trap in the corner since the spanning panel and superchunk are easier and more effective, but you could use the tube traps along the walls for both absorption and difusion.

                    As for the concrete form, I would do one of two projects. Project 1, DIY tube sub. Project 2, Helmholtz resonator tuned bass trap. For option 2, you would measure your room and find the most offensive peak, and then design the trap to tune it like an in room PEQ. The concrete form and a couple ends would form the chamber and a PVC piece could be the neck. Fill it with the right amount of absorption to set the Q or width, then decorate to please the wife.
                    Thought about that - would like to try some DIY speakers/sub but don't wanna commit any more $$ to experimenting until I get this room finished.
                    Did a speaker pair & sub long long time ago when I was installing car stereos...
                    When Rat Shack still sold some drivers & more of a DIY/tinkerer's place...:rolleyes:


                    Originally posted by HAL
                    What you are describing is a helmholtz resonator style absorbtion device. The tube is filled with something like polyfil or fiberglass. The bottom is sealed and the port of correct length is put into a top plate. This is tuned to a specific frequency band where the room mode caused by the corners are bad. Not a wide bandwidth device but can be useful in certain applications.

                    The ETF version 5.x software has the capability to design the helmholtz style of absorbers.
                    Originally posted by m-fine
                    I THINK what he was trying to describe was a 1/4 circle, or pie shaped glob of poly peanuts and expanding foam to stick in the corners. The problem with that idea (besides the materials, did you get the idea for using great stuff from a 'bama grad?) is that the resulting piece would be way to small as a broad band absorber of bass frequencies. 12" diameter tube cut into quarters would only stick out 6" per wall, you want 18" to 24" if you can fit it.

                    The Helmholtz would be a much better idea, but you need room measurements first, then build, measure, and tune. The concern is how was the tube cut in half? With 2 2'x12" tubes he could make a pair of nice resonators (they can look the same but be tuned to different peaks). If he cut it the other way and has 2 4' long half circles, I guess he could make decent broad band diffusers for the reflection points that would be effective down to about 300 hz.

                    Originally posted by m-fine
                    I missed this part! That is the key, as long as you have a bunch of funny looking abjects in the room and you tell people (with enough confidence) that they greatly improve the room accoustics, they will believe you and look up to you. I mean lets face it, you hang out with a bunch of fools who can not tell a bird of prey from a large carnivorous cat, so it is not like they are going to look at your room treatments and be able to deduce how effective they may or may not be!

                    [edit: test] [ = failed]
                    It was all a good idea, 'til I sobered up! Hey, at least my brain was working - ummm....then I sobered up...:hissyfit:
                    Yeah, I knew the 1/4 round wouldn't give me great bass trapping capability - although I woulda put 6" on the facing. I had no idea how low they would be effective. It was more for a WAF factor (GAF factor actually - it's her place technically) I did think about the 1/2 round thing too. No way I'm gonna try the Hermholtz thing...
                    I don't wanna try to tuna trap - I want my room to be dolphin friendly!!:neener::poke:

                    FIRST YA GOT MY BACK
                    THEN YA TURN ON ME:shiftyeyes:
                    That avvy - :eek:MY EYES!!!:boom::boom:
                    What are 'ya M - some yankee cousin of Mobile's???:raspberry::fryingpan:;);)
                    I've gotta send him this link, he would love it!

                    BTW - my AU friends would at least realize I was trying to treat my room.
                    UA friends aren't allowed in the house - they just say "Can't it go louder? Let's watch some wreslin'..." as they place their Colt45 cans on my X and sit on the sub... wait, that's why I don't have any UA friends :snaggletooth::fryingpan:;) Well, I do have a few - most of them are family:nervous:

                    Comment


                    • #11
                      Originally posted by rumonkey2
                      That avvy - :eek:MY EYES!!!:boom::boom:
                      I came across that on another site and thought of you! How do you like my new sig line? :stirthepot: :D

                      Comment


                      • #12
                        BTW, send him the link fast because I can't keep this... uh stuff too long. I have hated Nicky since his MSU days so the whole elephants wading in red water thing goes against my good senses.

                        Comment


                        • #13
                          just pmd him - keep it one more day????:nervous::scratchchin::fryingpan::dizzy:

                          Comment


                          • #14
                            Did you just ask me to keep a pro 'bama avatar? I think you need therapy!

                            Comment


                            • #15
                              Mobile has read this....

                              ....so, please, you can now get rid of that garbage!!!:boom::boxer::hissyfit::fryingpan:

                              Hey, pm'ing him at least shows I can take it as well as dish it out.
                              That's when it's fun - some of the SEC folk take it way to serious.
                              I have witnessed a divorce over AU/UA (and yes, it was noted in the legal papers!):dizzy: :toilet:

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