I built an IB sub!

Collapse
This topic is closed.
X
X
 
  • Time
  • Show
Clear All
new posts
  • Andrew Pratt
    Moderator Emeritus
    • Aug 2000
    • 16507

    I built an IB sub!

    I just finished installing the new IB sub in the new media room. Its really just roughed in right now but so far so good!

    Check out the pics here!




  • Burke Strickland
    Moderator
    • Sep 2001
    • 3161

    #2
    Andrew -

    Looks good. How does it sound?

    Burke

    What you DON'T say may be held against you...

    Comment

    • SiliGoose
      Senior Member
      • Aug 2000
      • 942

      #3
      Wow. That's one of the finest "built-in" systems I've yet seen. Very nice.




      -Sili
      www.campmurphy.net

      Comment

      • Lex
        Moderator Emeritus
        • Apr 2001
        • 27461

        #4
        Andrew, with the spacing there, I think you need a brace or two in that box interior. What you've got is in essense a sub with an open wall.

        Looks great, but I would put a lateral side to side brace above and below the drivers, and top to bottom. What do the bass experts say?

        Of course, you can always retrofit it if necessary.

        Lex
        Doug
        "I'm out there Jerry, and I'm loving every minute of it!" - Kramer

        Comment

        • David Meek
          Moderator Emeritus
          • Aug 2000
          • 8938

          #5
          Your room is looking very impressive Andrew. :T

          As far as bracing, I'd go further and put 2x6 studs alongside the three existing 2x4 studs that are above and beside the IB box. I'd also put two horizontal braces in the gaps between the three studs and also in the gaps to either side of the three studs. You want to keep the wall from flexing like a drum head, and becoming a larger part of the sonic equation.




          David - HTGuide flunky
          Our "Theater"
          Our DVDs on DVD Tracker

          .

          David - Trigger-happy HTGuide Admin

          Comment

          • Andrew Pratt
            Moderator Emeritus
            • Aug 2000
            • 16507

            #6
            Points well taken guys I'm still in the install phase and had planned on adding some more bracing to box and from the box to the wall and I beam above. I ran some sine waves through it last night from the laptop but it wasn't getting loud enough..hopefully the rotel pre amp will be able to drive the LFE channel hotter then the sound card did...

            Thanks for the compliments on the room though its nearing completion for now. Its great to finally see the product that I've had planned since the first time I saw the room...sometimes its a little scary to see how close it is to what I'd envisioned back in january when we first walked into the basement




            Comment

            • George Bellefontaine
              Moderator Emeritus
              • Jan 2001
              • 7637

              #7
              Wow, how big is that sucker, Andrew ?




              My Homepage!
              My Homepage!

              Comment

              • Andrew Pratt
                Moderator Emeritus
                • Aug 2000
                • 16507

                #8
                box is 24" * 24" with dual 15" tempest drivers




                Comment

                • ThomasW
                  Moderator Emeritus
                  • Aug 2000
                  • 10934

                  #9
                  Andew

                  Too bad you didn't post this in the DIY area

                  You should put some 2"X4" bracing on the large flat areas. These are going to resonate and will effect the performance




                  theAudioWorx
                  Klone-Audio

                  IB subwoofer FAQ page


                  "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson

                  Comment

                  • Markj
                    Senior Member
                    • Aug 2000
                    • 323

                    #10
                    Wow very impressive Andrew!

                    Comment

                    • Andrew Pratt
                      Moderator Emeritus
                      • Aug 2000
                      • 16507

                      #11
                      Thomas I guess the DIY area might have worked better ops:




                      Comment

                      • efarstad
                        Moderator Emeritus
                        • Jun 2001
                        • 2231

                        #12
                        Looks good buddy!

                        E





                        The Norwegian A/V Nut!
                        E-Cinema

                        The Norwegian A/V Nut!
                        E-Cinema

                        Comment

                        • David Meek
                          Moderator Emeritus
                          • Aug 2000
                          • 8938

                          #13
                          Andrew, how's the bracing and finish-up coming on your bad boy?




                          David - HTGuide flunky
                          Our "Theater"
                          Our DVDs on DVD Tracker

                          .

                          David - Trigger-happy HTGuide Admin

                          Comment

                          • Andrew Pratt
                            Moderator Emeritus
                            • Aug 2000
                            • 16507

                            #14
                            Didn't get much more done last night since I was working on some clients pronto's but I did grab my wifes portable CD player and used it to run some CDR's with a sin wave from 100 hz down to 1 hz. Using the head phone out i was able to get a much louder signal so I was better able to get a "feel" for what it will do. My first test showed that the wall its attached to shakes a lot when its gets down deep so I might have to brace that wall. I also didn't feel a lot of bass pressure though the room was shaking so my listening spot might be in a null...guess I'll have to do some room measurements when the pre amp arrives and see what I'm up against. I know I'll likely need the BFD to smooth things out.




                            Comment

                            • ThomasW
                              Moderator Emeritus
                              • Aug 2000
                              • 10934

                              #15
                              Andrew

                              Don't concern yourself with trying to brace the wall/drywall in the room. To make any significant difference the entire wall would need to be stiffened. I'm helping a guy here in Denver with his basement HT. He's going to screw 3/4" MDF or OSB on the studs before installing the drywall. That should adequately stiffen the entire room.

                              Do brace the wooden surfaces of the manifold box . I'm not quite sure why you chose to make them so large, but since you did they need to be stiffened. If they aren't they will resonate canceling out some of the signal from the sub. Diagonal crossbracing is the best method to use. Given the large size of the box, nail/screw 2"X4"s in an "X" pattern to all the outside surfaces that don't have drivers on them.

                              I don't know any low buck sources in Canada for the Behringer. In the US http://www.lentines.com has the best pricing




                              theAudioWorx
                              Klone-Audio

                              IB subwoofer FAQ page


                              "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson

                              Comment

                              • David Meek
                                Moderator Emeritus
                                • Aug 2000
                                • 8938

                                #16
                                Thomas, I agree that best-case the whole wall should be stiffened, but wouldn't bracing the studs closest to the drivers minimize the diaphragm action of the wall as they are the closest to the source of the movement? When I say closest, I mean not only the studs touching the enclosure but also the ones beside it.

                                Just trying to understand. . .




                                David - HTGuide flunky
                                Our "Theater"
                                Our DVDs on DVD Tracker

                                .

                                David - Trigger-happy HTGuide Admin

                                Comment

                                • ThomasW
                                  Moderator Emeritus
                                  • Aug 2000
                                  • 10934

                                  #17
                                  David

                                  Yes stiffening the entire wall/room would be beneficial if possible. But to do it properly it would need to have OSB or MDF applied before the drywall.

                                  In Andrew's case, the wall flex of the box will be the most problematic issue since they are immediately adjacent to the cones. This will impact the sound before it even enters the room




                                  theAudioWorx
                                  Klone-Audio

                                  IB subwoofer FAQ page


                                  "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson

                                  Comment

                                  • Andrew Pratt
                                    Moderator Emeritus
                                    • Aug 2000
                                    • 16507

                                    #18
                                    Ok I'll add some bracing to the box this weekend as well as bracing the entire box to the floor joists above. One other concern I have is that while playing those test tones the gear rack located beside the IB was shaking a fair amount as well...that can't be good.




                                    Comment

                                    • ThomasW
                                      Moderator Emeritus
                                      • Aug 2000
                                      • 10934

                                      #19
                                      Yup the equipment vibratiing is a problem as well.

                                      But the solution is likely simple. Try some sorbothane pucks they are available from http://www.partsconnexion.com/catalo...materials.html I use a product similar to the large EAR pucks under every piece of equipment I own. One must be careful with sorbothane because if it gets too hot it melts and is a sticky mess!

                                      There are also tons of DIY devices, check the Ausio Asylum Tweaks/DIY forum along with a search of their archives for things like DIY vibrapods, etc.




                                      theAudioWorx
                                      Klone-Audio

                                      IB subwoofer FAQ page


                                      "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson

                                      Comment

                                      • Andrew Pratt
                                        Moderator Emeritus
                                        • Aug 2000
                                        • 16507

                                        #20
                                        I'll have to try something like that on the DVD player and VCR. The CD juke box has the two HK 5 channel amps on top of it so it isn't going to move much I thought I'd try bracing the gear rack to the I beam above it as well that might help cut down on some of the vibration.




                                        Comment

                                        • ThomasW
                                          Moderator Emeritus
                                          • Aug 2000
                                          • 10934

                                          #21
                                          Andrew

                                          The bass energy will migrate throughout the entire structure. Walls, floor, etc. The weight of the amps won't provide 'isolation' from the sound pressure. They will simply lower the resonant frequency of the equipment they're sitting on. This is a good thing but some pucks or other isolation device would be beneficial.

                                          There are a million different devices for isolation. Check this thread from the asylum on DIY roller blocks. These are very inexpensive and work well.

                                          Oh and BTW you only need 3 of any of these per piece of equipment not 4.




                                          theAudioWorx
                                          Klone-Audio

                                          IB subwoofer FAQ page


                                          "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson

                                          Comment

                                          • Andrew Pratt
                                            Moderator Emeritus
                                            • Aug 2000
                                            • 16507

                                            #22
                                            is this what you're talking about thomas?






                                            Comment

                                            • ThomasW
                                              Moderator Emeritus
                                              • Aug 2000
                                              • 10934

                                              #23
                                              Yup that's one of many versions out there. I haven't played with that design but it looks pretty good if there's enough room in the rack for them.

                                              Edmund Scientific sells sheets of sorbothane. These would be useful of space is at a premium. The cool thing about sorbothane is that it is a solid with the physical properities of a liquid!




                                              theAudioWorx
                                              Klone-Audio

                                              IB subwoofer FAQ page


                                              "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson

                                              Comment

                                              • Andrew Pratt
                                                Moderator Emeritus
                                                • Aug 2000
                                                • 16507

                                                #24
                                                hmm looks like I should start looking for some of that locally. All my shelves are sitting on adjustable "pegs" so I was also thinking of getting some isolation between the shelf and the supports.




                                                Comment

                                                • Lex
                                                  Moderator Emeritus
                                                  • Apr 2001
                                                  • 27461

                                                  #25
                                                  Sorbothane is a very cool material, and I would have to say, should be a great dampening material. I have used sorbothane shoe liners, so I am very familiar with the material. It's great stuff!

                                                  Lex
                                                  Doug
                                                  "I'm out there Jerry, and I'm loving every minute of it!" - Kramer

                                                  Comment

                                                  • Andrew Pratt
                                                    Moderator Emeritus
                                                    • Aug 2000
                                                    • 16507

                                                    #26
                                                    ok I moved the tread to the DIY area where it belongs I'll try and post some pics of the bracing I did last week




                                                    Comment

                                                    • ThomasW
                                                      Moderator Emeritus
                                                      • Aug 2000
                                                      • 10934

                                                      #27
                                                      Hey Andrew

                                                      How does it sound? :?:




                                                      theAudioWorx
                                                      Klone-Audio

                                                      IB subwoofer FAQ page


                                                      "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson

                                                      Comment

                                                      • Andrew Pratt
                                                        Moderator Emeritus
                                                        • Aug 2000
                                                        • 16507

                                                        #28
                                                        Thomas given my only source right now is my wife's portable CD player sound is hard to judge I haven't tried it again since I added the braces to the sides so I expect it will be better then it was...I'll post some pics tonight.




                                                        Comment

                                                        • Andrew Pratt
                                                          Moderator Emeritus
                                                          • Aug 2000
                                                          • 16507

                                                          #29
                                                          ok here's a new pic of the bracing I added to the box. The tall 2 by 4 extends from the basement floor to the floor joists above and really adds strenght to the box. There's also 2 by 4's glued and screwed to the top attatching the box to the side wall and to the gear rack beside it. I will add one more brace and that will go on the bottom but its already got two at the front and back acting as supports but one more won't hurt






                                                          Comment

                                                          • ThomasW
                                                            Moderator Emeritus
                                                            • Aug 2000
                                                            • 10934

                                                            #30
                                                            Looking good Andrew.....

                                                            You've probably got the best bass from any 'DiscMan' on the planet. 8O




                                                            theAudioWorx
                                                            Klone-Audio

                                                            IB subwoofer FAQ page


                                                            "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson

                                                            Comment

                                                            • David Meek
                                                              Moderator Emeritus
                                                              • Aug 2000
                                                              • 8938

                                                              #31
                                                              :B




                                                              David - HTGuide flunky
                                                              Our "Theater"
                                                              Our DVDs on DVD Tracker

                                                              .

                                                              David - Trigger-happy HTGuide Admin

                                                              Comment

                                                              • Andrew Pratt
                                                                Moderator Emeritus
                                                                • Aug 2000
                                                                • 16507

                                                                #32
                                                                Ok since the Rotel pre amp came in last night I finally got to hear this sub dialed in properly. My impressions so far is that its very tight sounding bass and blends very well with the maggies esp in music. It doesn't seem to have the same punch the large ported tube had when I listened to that glass sphere explode at the begining of Star Wars EP1 but I have some minor tweaking to do yet...it did flap my pant legs though so its not for a lack of output I'll plot some freq responses this weekend and see how that looks before I comment to much further. One thing I definitly need to do is add some sorbothane to the gear rack sine its still rattleing a little and I need to find a way to fasten the doors on the gear rack better since they too rattle...its all good though LOL




                                                                Comment

                                                                • ThomasW
                                                                  Moderator Emeritus
                                                                  • Aug 2000
                                                                  • 10934

                                                                  #33
                                                                  It doesn't seem to have the same punch the large ported tube
                                                                  That's because the large ported tube sub added emphasis to certain areas of the bass spectrum. An IB doesn't do that. If you want more 'punch' dial in a little bass boost with the pre/pro.

                                                                  I simply turn up the IB output when watching DVD's.




                                                                  theAudioWorx
                                                                  Klone-Audio

                                                                  IB subwoofer FAQ page


                                                                  "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson

                                                                  Comment

                                                                  • Andrew Pratt
                                                                    Moderator Emeritus
                                                                    • Aug 2000
                                                                    • 16507

                                                                    #34
                                                                    thomas I'll likely run the IB a little hot for DVD's and keep it toned down for music. Any thoughts on the email I sent you?




                                                                    Comment

                                                                    • Andrew Pratt
                                                                      Moderator Emeritus
                                                                      • Aug 2000
                                                                      • 16507

                                                                      #35
                                                                      Here's an SPL plot that I just ran....The blue measurements were taken right from the mouth of the IB sub where the couch measurements (pink line) were at ear level at the sweet spot. Looks pretty good other then the massive hole at 50 and the bump in the mid twenties...also appears theres lots of SPL's down below 16...I measured 80dB at 10Hz (uncorrected) so I think that's at least 92dB corrected if I'm not mistaken 8O






                                                                      Comment

                                                                      • ThomasW
                                                                        Moderator Emeritus
                                                                        • Aug 2000
                                                                        • 10934

                                                                        #36
                                                                        The null at 50Hz is probably why you don't think it has as much 'punch' as the tube sub did.

                                                                        And yup you need a Behringer........

                                                                        Other than that, now you can see (hear) why I have such a liking of IB's




                                                                        theAudioWorx
                                                                        Klone-Audio

                                                                        IB subwoofer FAQ page


                                                                        "Complicated equipment and light reflectors and various other items of hardware are enough, to my mind, to prevent the birdie from coming out." ...... Henri Cartier-Bresson

                                                                        Comment

                                                                        • Andrew Pratt
                                                                          Moderator Emeritus
                                                                          • Aug 2000
                                                                          • 16507

                                                                          #37
                                                                          I figured that's why I wasn't feeling the punchy bass. I installed a few 2*4's perpendicular to the wall studs along the common wall b/t the HT and the laundry room and that seems to have helped strenghten the wall...at least I hear less vibration coming from that wall now.




                                                                          Comment

                                                                          • Sonnie Parker
                                                                            • Jan 2002
                                                                            • 2858

                                                                            #38
                                                                            Looks promising Andrew.

                                                                            I have that same dip at 50hz but didn't lose any punch over it. I did boost it a little but not much movement was made. My null was room induced (with all my openings) so I couldn't do much with it. I would be surprised if your new room would allow much output to leave so it could just be location.


                                                                            Consider setting up 2 presets on the BFD, one for music and one for movies. And as mentioned elsewhere, you might consider a house curve for movies. That should provide you with plenty of punch. At least it did me and I still have a dip at 50hz. Plus your dip is not that wide.






                                                                            SONNIE

                                                                            Cedar Creek Cinema

                                                                            DVD Collection

                                                                            BFD Comprehensive Setup Guide

                                                                            Comment

                                                                            Working...
                                                                            😀
                                                                            😂
                                                                            🥰
                                                                            😘
                                                                            🤢
                                                                            😎
                                                                            😞
                                                                            😡
                                                                            👍
                                                                            👎
                                                                            Searching...Please wait.
                                                                            An unexpected error was returned: 'Your submission could not be processed because you have logged in since the previous page was loaded.

                                                                            Please push the back button and reload the previous window.'
                                                                            An unexpected error was returned: 'Your submission could not be processed because the token has expired.

                                                                            Please push the back button and reload the previous window.'
                                                                            An internal error has occurred and the module cannot be displayed.
                                                                            There are no results that meet this criteria.
                                                                            Search Result for "|||"