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Infinite baffle in your home ?

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  • Kornbread
    replied
    Well, guess I haven't really helped out much.

    I'll check out the tunes after the fam leaves the premises.

    Leave a comment:


  • Fishchris
    replied
    BTW, I have a good sized collection of music with bass down to 20 hz. Of course, if I had a system that could play well below 20 hz, Id have to search out a selection of even lower bass tracks. Its out there, you just have to know where to look.

    Hey btw, this is a fun one in my truck ;) If you are able to play low bass... in your vehicle, or your home, it doesn't matter, just check it out
    https://www.youtube.com/watch?v=R7XntN5citQ

    Leave a comment:


  • Fishchris
    replied
    Originally posted by Kornbread View Post
    And back to the OP and doing an IB in a truck.
    Before cutting a hole in the floorboard, how about going out the back? Cut a hole in the back of the truck cab and front of bed. Use an inflatable donut to seal the area between the cab and bed. Use a tonneau cover to keep everything in the bed dry. There used to be inflatable donuts made specifically for sealing between truck cabs and camper shells.
    I did once remove my truck's back glass, replace it with plexiglass, cut four 8" holes in the plexi, and vent a couple Orion 12xtr in an isobaric driven by an Orion 250hcca.
    Yes, I thought about that too. I have actually done a blow through in an older truck of mine. Worked fantastically for 7 years, and never leaked a drop of water Too long a story, but I did use rubber from an inner tube from a bus... rivets, silicone, etc.
    Also, I do have a bed cover which I love, and would not get rid of.... but it wont freely blow around like a soft cover. Its fiberglass.

    I talked to the guy that was a national champion for SQL, and I mentioned putting the IB subs in the front of the bed (in a blow through arrangement), with the bed cover, and having only cloth, at the tail gate.... and he said, that could totally work, but that would effective turn my bed into a giant horn.... which would be a whole new ball game. Not necessarily bad, but would need to be played with and tested.

    Think I'll stick to the floor



    Leave a comment:


  • Kornbread
    commented on 's reply
    I was wondering about a v-shaped manifold as the hvac unit resides directly behind the access door. This might buy just enough room to let things fit.

  • scholl
    commented on 's reply
    Lot's of pop music with very low frequencies. The SACD of DSOTM for starters. Buoyance, Billie Ellis, Kanye, Massive Attack, Trombone Shorty.

    I do hear some studio noise the got left in the mix too. The producers probably couldn't hear it on their systems. I hear all of that on my TD15S too. They go to 20hz in room.

  • scholl
    commented on 's reply
    Yes and no, the depth of the manifold controls the point where the subwoofer's high frequency breakup starts. At a 1/4 wavelength of the depth, cancelations start and the sub becomes unusable above that. Make it as short as possible. It's possible to create a "V" shaped manifold to extend that frequency. Smaller, thinner woofers may be needed.

  • Kornbread
    replied
    Originally posted by tvrgeek View Post
    5 Hz. Yea. lots of music there. Sorry, but solving problems that don't exist. Kind of like driving a new C7 Corvette down the road @ 35. You can, but it is pointless.
    IB in a truck? Well, let us assume that the goal is to listen to music. There is darn no actual pop music with content below 60 Hz. Go test some CD's and you may be surprised. Not to hard to do a couple of 8's in a sealed box with a bit of eq at levels that would cause instant ear bleeds and distortion remaining below 10%. Too many are falling for the Fletcher Munson ( incorrect) definition of hearing 20 to 20. Almost no males can hear above about 16 or 17, and much below 40 is more feel than hear. Only a pipe organ has a natural note down to 32. My viewpoint of course. 7 billion people in the world, so more than one viewpoint.

    Shiva. That is a brand I had not heard for a while. Top notch if I remember.

    Push-pull. Big fad a while back with some magic about canceling distortions caused by the basket. I thought it had gone away along with magic speaker cables and foil triangles.
    Shiva is a driver from Adire Audio who were early adopters of xb^2 tech. IIRC, this tech, or a derivative of it, has recently reappeared in a higher-end manu.

    No pop music content below 60hz.? Not all of us listen to pop. Have you listened to pop since the 80s?

    I would say more like 40hz than 60hz., but a grand piano can reach <30hz. while some reach <17hz., bass guitar <60, and most any edm/house/synth compositions reach below, well, if you had a system capable of true low end you were to play Bass I Love You you would be able to see/feel your woofers pulsate around 10hz. Even reverb of the concert hall can be caught in the lower resisters helping to recreate the original performance. So for you, maybe it is solving problems that do not exist. For some of us, maybe we don't like leaving part of the music out even if we only feel it.

    Leave a comment:


  • Kornbread
    commented on 's reply
    Can this tune the output similar to a ported subf?

  • scholl
    commented on 's reply
    All true but. if a person uses a pair of woofers with 24hz Fs in PPSL they'll get good deep bass without trying if they have the environment to build it in.

  • scholl
    commented on 's reply
    Exactly, My manifold cross area is about 1/4 the combine cone area. Not even close to chuffing.

  • tvrgeek
    replied
    5 Hz. Yea. lots of music there. Sorry, but solving problems that don't exist. Kind of like driving a new C7 Corvette down the road @ 35. You can, but it is pointless.
    IB in a truck? Well, let us assume that the goal is to listen to music. There is darn no actual pop music with content below 60 Hz. Go test some CD's and you may be surprised. Not to hard to do a couple of 8's in a sealed box with a bit of eq at levels that would cause instant ear bleeds and distortion remaining below 10%. Too many are falling for the Fletcher Munson ( incorrect) definition of hearing 20 to 20. Almost no males can hear above about 16 or 17, and much below 40 is more feel than hear. Only a pipe organ has a natural note down to 32. My viewpoint of course. 7 billion people in the world, so more than one viewpoint.

    Shiva. That is a brand I had not heard for a while. Top notch if I remember.

    Push-pull. Big fad a while back with some magic about canceling distortions caused by the basket. I thought it had gone away along with magic speaker cables and foil triangles.

    Leave a comment:


  • Kornbread
    replied
    And back to the OP and doing an IB in a truck.
    Before cutting a hole in the floorboard, how about going out the back? Cut a hole in the back of the truck cab and front of bed. Use an inflatable donut to seal the area between the cab and bed. Use a tonneau cover to keep everything in the bed dry. There used to be inflatable donuts made specifically for sealing between truck cabs and camper shells.
    I did once remove my truck's back glass, replace it with plexiglass, cut four 8" holes in the plexi, and vent a couple Orion 12xtr in an isobaric driven by an Orion 250hcca.

    Leave a comment:


  • Kornbread
    replied
    Having a quad of woofers mounted in a cube, opening into the room from between studs, didn't present much of a problem other than some stuff falling off shelves. Having a pair of 18s' mounted with both facing outwards is having detrimental effects on the house's sheetrock walls. I need to look into this type of mounting. It looks like your woofers are facing the same direction and wired out of phase? Is there a size, or way to calculate the size of the slot so as not to cause any chuffing?

    Leave a comment:


  • scholl
    commented on 's reply
    There's random threads about PPSL on line in other forums. With this design building the manifold is about making the dimensions so that it's wid enough so the inward facing woofer's cone doesn't hit the outward facing woofers magnet.. The height has to fit the woofer diameter of course. and any kind of mounting has to fit into the wall. So, teh design is about woofer size and mounting rather than designing for the woofer's parameters. Air leaks are just as harmful so the manifold has to be well sealed. If the woofers are matched there's very little vibration. Mounting one woofer in a wall baffle will have huge distortion from the wall shaking.

  • Kornbread
    replied
    Originally posted by scholl View Post
    With the push pull slot loaded IB the drivers don't exert that much. If I get those moving 1/4" the hair will vibrate on your arms. The room pressurizes in such a way a draft can be felt. I call it the "bass winds". This isn't the tactical feel you get from "punch" its a whole different experience I've heard no one else describe. I don't even think the producers know it's happening. Here's an in room response, both speakers driven at the listening position Crossed at 100hz.Click image for larger version

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    You have a write up or source of information for the push/pull?

    Leave a comment:

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