I live in a small aprtment in Japan. My room has huge dips between 80Hz and 100Hz, confirmed with REW measurement. I can’t install large number of bass traps because

  • Installing bass traps to the left rear corner blocks the way to the hallway.
  • There are windows on the right side of the room.
  • There is a sliding door behind MLP.
  • The walls near the right speaker is located have an outlet and a ventilation hole, preventing me from installing bass traps very close to the floor. The walls near the left speaker don’t have outlets or ventilation holes, though I want to install same number of traps symetrically.
  • The ceiling is little lower around front corners (about 2.0m. other places have 2.4m ceiling)

Item: ATS Acoustic Bass Trap - 24 x 36 x 4
Quantity: 2
Choose your fabric color: Ivory; Bass Trap Installation Hardware: Corner Installation Hardware; Desired Absorption Range: Full-Range; Desired edge profile: Square

Item: ATS Acoustic Bass Trap - 24 x 24 x 4
Quantity: 2
Choose your fabric color: Ivory; Bass Trap Installation Hardware: Corner Installation Hardware; Desired Absorption Range: Full-Range; Desired edge profile: Square

I’m thinking of importing those ATS acoustic bass traps to Japan via MyUS because bass traps sold in Japan are poor quality, or prohibitively expensive. DIY could be cheaper but requires some time and effort.

If more traps are really needed I could mount more traps on higher places on the wall this way, but I’m afraid that installing many traps in this way make me feel I’m in a even narrower room.

I’ve also seen claims that dual subs could solve standing waves, but is that true? Even if that’s true, could that be very annoying for my neighbors (even with very low subwoofer volume)? I currently only have front speakers (ELAC DBR62).

https://gearspace.com/board/studio-building-acoustics/1301752-spare-bass-traps-worth-putting-directly-behind-monitors.html#post14632464

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https://preview.redd.it/5fokipag283c1.png?width=1096&format=png&auto=webp&s=51b97d7123f09aa498ac17c94360fba27439f435

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  • sgtwo@alien.topBEnglish
    1·
    1 year ago

    You can’t fix this with any form of absorber, filling a dip would rather require selectively amplifying these frequencies, which is also unrealistic.

    The only realistic approach is to use a parametric equalizer to attenuate all ther frequencies, by say 10dB to keep it realistic.

    • vroad_x@alien.topOPBEnglish
      1·
      1 year ago

      The amount of the dip changes a lot depending on where I sit in the room.

      Fixing dip with EQ in one location causes problems in other locations, that’s my understanding of why EQ can’t be replacement of proper room treatment.

      • sgtwo@alien.topBEnglish
        1·
        1 year ago

        Dips (and nodes) being localized is an intrinsic property of standing waves, and their frequencies and positions are exclusively defined by your room’s geometry. Absorbing requires at least 1/4 of the frequency ‘s wavelength ; in your case, it takes meters of absorbant. Plus, it only fixes peaks, not dips. Once you admit this physical reality, you understand that there an only be a compromise, which is linearizing as much as possible the respinse curve, for one seat at listening position (or averaging two or three seats), using parametric equalization. This is exactly what the commercial room correction solutions do (audyssey, dirac etc). And it is only useful below 200 hz.