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BUILD LOG 990 cubic feet (2)18.25"x8.25"x2" ports 9Hz tune Twin Towers come down

Discussion in 'Home Theater Projects' started by kryptonitewhite, May 1, 2011.

  1. kryptonitewhite

    kryptonitewhite Well-Known Member

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    I have decided to take Thomas-W's advice and build a manifold on my door to house (4) Fi IB3 18's on the top and make 2 slot ports on the bottom out of the rectangles already there. The door is 1.25" thick, I will make a template/face of the entire door adding .75" to the thickness. I'll make a 25"x25" panel to plug the ports so I can run true IB as well. Here is a pic he suggested for me.



    I will begin tearing the Twin Towers down tomorrow and use the wood to build the manifolds and ports. It will be nice to get the EP4000s out of the HT room cuz I haven't done the fan mods.

    The IB3s are custom dual 4 ohm, 4 layer IIRC, series/parallel 4 ohm bridged per EP4000 (2 EP4000s, 2 subs per amp bridged).

    I am wasting and tearing apart a very wonderful performing pair of enclosures. Under 10% THD these things hit 124dB @ 10Hz and 130dB @ 23Hz. If I would have braced them better that 25Hz-40Hz would have been fixed. They were 125 cubic feet each with a 12" port 12" long for a 13.4Hz tuning, 2 IB3s per tower.

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    Here is the Twin Towers build log:

    http://www.avsforum.com/avs-vb/showthread.php?t=1231247
     
  2. kryptonitewhite

    kryptonitewhite Well-Known Member

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    Also I'll also be putting a big wheel or a pair of big wheels with constant pressure, either spring loaded or air filled tires. I'll mount them partially deflated then air them up and squeeze them back on.
     
  3. kryptonitewhite

    kryptonitewhite Well-Known Member

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    Ideas are constantly filling my pea brain, I'll try to update as much as possible. Under the door needs sealed up so I will have a larger piece of 1/2" MDF in the doorway bottom with a 2x4 glued and screwed to it to complete a full rectangle door jamb with weather stripping to make an airtight seal and prevent buzz and rattle.

    The closet in the spare room is well over 10 cubic feet so this will actually be over 1000 cubic feet. When i build the double layer manifold, the outter layers will be extra long to add strength to the entire door... the manifold itself and 4 18's will be quite heavy... but more so to help prevent cancellation.

    I have an idea and a little experience that larger fatter ports that i use since I love huge airspace creates unloading and cancellation much more than smaller longer ports. There are SPL setups in vehicle "walls" where there is actually not a wall. About 1/3rd of the "wall" is subs mounted in several layers of mounting rings, but in between each sub it is cut out... more port area..each subs mounting rings are only as wide as the mounting flange itself. The other 2/3rds of the "wall" is port as well. Basically they have 10-20 subwoofers all on a horazontal plane but nothing in between them, acting as port, and to the side all open. This creates an ultra high tuning in the 70Hz - 80Hz range with an enclosure volume from 20-50 cubic feet. When they go below 70Hz I believe they unload quite a bit more than a guy with one sub in 3 cubic feet with a 4"x4" port 30" long when he plays below his tuning.

    So anyway, I believe my bringing the sides of the manifolds all the way down to the bottom of the door and extending the bottom of the manifold out a ways will somewhat act as a port itself, cupping the actual ports. I believe I will end up tuned below 8Hz when this is all done.

    Today I will set my REW mic stand back up, reinstall REW, then make my final Twin Towers video, a request from Graham. I'll make the vid, run a few sweeps as it is, then I will cut the ports out...leaving the ports 12" diameter x 3/4" length and run a few more sweeps. Ive had threads discussing whether extremely short port lengths with very large diameters fully function, and if yes or no, does this change with output levels...maybe at low volume it works but at moderate and high levels it does not.

    I am afraid that over 1000 cubic feet, with 2 2" long ports with a lot of area, will not really act like ports. I am also worried that with them being so large in area but so short with all 4 subs mounted right next to them, cancellation and unloading will be a big problem.

    FINAL PICS OF THE TOWERS:

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    hopefully those pics last a little while before bandwidth runs out. With the new project drawing more attention, as views and hits get high I get emails that they will be disabled for 30 days. Happens a lot on weekends and holidays.
     
  4. kryptonitewhite

    kryptonitewhite Well-Known Member

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    I can't tear them down now. I'm getting more 12" tube, more caulk, and more 2x4s.... plus I gotta do something to my room but i don't even know where to begin. I'm gonna go back to 48" port lengths 6.5Hz tune and slowly chop them shorter if I can't handle the reduced output traded for single digit extention.

    Graham made a great suggestion to make a vid of this track, Ive done it before. I haven't pushed the Towers much for quite a while

    now, sold all my DVDs and Blurays cuz they all just got old, my PC sucks... I dropped $$$ on a Radeon HD 4550 7.1 surround sound

    HD card to watch Netflix and HULU in surround, but I only get 2 channel output from the card so I have to turn my mains and

    surrounds all the way sown and my subs all the way up to get anyoutput and it's weak. I was gonna tear them down today, was

    testing out the track to find my limits, and the fan blades started spinning again..Ive never been able to catch that on

    camera...not just bouncing but spinning. Now I remember how much output I get and I am afraid to tear them down now :( IDK what to do!

     
  5. kryptonitewhite

    kryptonitewhite Well-Known Member

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    Well I never planned on using the mic in the house anymore cuz I swept, reswept, tried it with heater and all lights on, kitty sitting in the LP to see if his fur soaked up deebeez... I got mic'ed out so i tore the rig apart and rebuilt it for the van. Well I wanted to lay to rest the large port diameter short port length problem, planned on doing a sweep before I tore the ports out, then a sweep after I ripped the ports out...then tear the towers down.

    I haven't dropped the hammer on the volume knob in a while..WOW I forgot how powerful there are. I can't do it. I'm sorry, but i jsut can't. Since I have the rig all set up, I may as well do a sweep anyway. So it is in my head now notnyt and Bosso, I got it... I am good to 9Hz then I am DEAD. This sweep clearly shows it.

    I am going to get 2 more 12" x 48" sonotubes, rip these ones out, add bracing to fix the buzzes and rattles and that terrible suck out from 25Hz-37Hz.... and retune to 6.5Hz again. This time I will take my time now that I know better instead of listening for a few minutes then cutting the ports shorter. If I like it, if I can deal, I will stay tuned to 6.5Hz.... but i suspect I will raise it to 9Hz or so.

    I'm gonna tear the rig down and go run REW in my van some more, see if flipping the phase on the 6.5's helped and I raised the level on the 4.5s and tweets. Hopefuly I can get the front stage tweaked, my sub amp should be back any day, then I can phase shift the subs and get it all flattened out :)

    [​IMG]

    [media=youtube]X2R5EMO5ggM[/media]
     
  6. kryptonitewhite

    kryptonitewhite Well-Known Member

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    I'm not abandoning this build, I am just slowing down and being more cautious. After making those vids today it reminded me just how much output I already have, just dont use it much. I want more in the single digits which means a huge sacrifice in the double digits and IDK if I am willing to make that trade. I'm going to brace and tune to 6.5Hz for a while and see if I like it. If I can deal, then I make continue this build to shift the FR to get more down low with more airspace.
     
  7. kryptonitewhite

    kryptonitewhite Well-Known Member

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    I tought brandy how to run REW today so that she can run the sweeps on the PC while I adjust the volume on the receiver so we dont bottom with the ports cut out then with the new ports in. Tomorrow we're getting 2 sonotubes 12"x48" for 6.5Hz tunes. We will run compression sweeps in 5dB increments from 40dB to 15dB then 1Hz to 14dB, 13dB, and 12dB... I have gotten to 10dB without hard bottoming but I dont push the new subs like I did the reconed subs.

    Then I will cut the ports out, run more sweeps, put the new ports in and run more...overlay them all.

    REALLY FUN VIDEO of us running sweeps with REW and sine waves with NCH Tone Generator to see how bad flex is, where it is, what we need to do to fix it, and getting an idea if we can fix all the room flex and noises. 4 ported 18s in a tiny room gets very annoying tuned so low. I am at a breaking point of just getting rid of it, or attempting to fix the towers (theyre actually not that bad, all of the noise is the room, not the enclosures) as they lose a lot of output from 25Hz-40Hz from flex.

    [media=youtube]kmK_U_qLkFU[/media]



    So we have an idea what to expect if the 12" x .75" port actually works

    fr

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    spl

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    if I like the 6.5Hz tuning, we will most likely enjoy the towers for a while longer, get more wood, build the manifolds and ports onto the door, then swap the subs...leaving the towers up just in case.

    KW
     
  8. kryptonitewhite

    kryptonitewhite Well-Known Member

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    I forgot about sealed up. I have 2 16.5" cutouts for the 2nd subs, I'll stick a 2x4" though each port after we sweep with .75" port lengths, turn them float against the wall over the port from the inside, and bolt the 16.5" circles over the 12" holes to seal the towers up and run sweeps sealed.

    Also I will try to get the sliding door track so I can shut the vault for the sweeps. All sweeps lately have been with the vaulted door open as I dont ave the track yet.
     
  9. kryptonitewhite

    kryptonitewhite Well-Known Member

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  10. kryptonitewhite

    kryptonitewhite Well-Known Member

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  11. kryptonitewhite

    kryptonitewhite Well-Known Member

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  12. kryptonitewhite

    kryptonitewhite Well-Known Member

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    SOMEBODY PLEASE TALK ME OUT OF THIS. PLEASE. All I need to do is run 2x4s from side to side in the towers and attatch them to the front to back 2x4s, drop in new 48" ports, and be done! Someone?

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  13. kryptonitewhite

    kryptonitewhite Well-Known Member

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    im betting that the spare room is gonna have a much better fr than the HT room and i end up building another bed and setting up in there. Ill be boarding up both windows in there so the enclosure "seals up" better, there's only a small closet and the one door that will be the manifold/port. It's a touch over 1000 cubes with the closet open. The HT room is 1400 cubic feet, has the SR door, front door, and entryway vaulted door as well as 2 windows that are also to be boarded up.
     
  14. kryptonitewhite

    kryptonitewhite Well-Known Member

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    So I am back on my messed up schedual, up all night sleep all day. Yesterday AM I was all gung hoe to tear the towers down before Brandy went to work so I could clean the carpets then build the manifolds. I lasted till 11AM then crashed. As usual thats when she got up, went and bought fuses so we had lights again, then she went to work...I was out cold till 12AM, she got home from work, now she ready to watch a few episodes of Lost then go to sleep. I made a pot of coffee, I will be up all nite with nothing to do. Gotta make it till Don shows up so I can fix his power wire, then I will crash all day, she has the day off...ugh!

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    like I said, she gotta watch Lost...

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    So I always find myself trying hard to make something work, like worried if I superglue my cubes to my towers they will just fall off. But when I want to ge them off, they wont come off. I had to POUND and pound the speaker, it flew to the floor and a tiny piece broke inside, now I get to take internal pics of my L/C/R/surrounds ;) Some day i will get Bob's dual FR125S w/quasi crossover and tweets kits...till then...

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    YUP, thats 6ohm 10W!

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  15. kryptonitewhite

    kryptonitewhite Well-Known Member

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    So no work getting done here, Brandy and Austin are out cold... he just turned 13 today... kittys are sleepin, so I am here again talkin to myself hoping for other night owls like me. Thought I'd share this thread that someone started over at ROE today. It makes all this crap I do worth it, all the negative responce I've gotten over the years all disappears with the good things like these:

    " You know you're Kryptonitewhite when... "

    http://forum.realmofexcursion.com/off-topic/72145-you-know-youre-kryptonitewhite-when.html

    Here's a few exaples, made my night.








































     
  16. kryptonitewhite

    kryptonitewhite Well-Known Member

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  17. kryptonitewhite

    kryptonitewhite Well-Known Member

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  18. kryptonitewhite

    kryptonitewhite Well-Known Member

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    my last post here since I get no love


    All the shit talk in the beginning about "how are you gonna move them?" All these guys saying "it's gotta be this light and only this big so 2 guys can move it". Brandy just had to ask if I had anything to say. Hah. Wromg thing to ask.

    Twin Towers Come Down, me moving tower 1 all by myself.

     
  19. Lewisclan

    Lewisclan Member

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    For some reason I can not open any of the Photo bucket files / Ok I just seen on another thread that you know about the fix to this problem.
     
  20. kryptonitewhite

    kryptonitewhite Well-Known Member

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