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Dynamat DynaBox

Isolation enclosure for ceiling-mounted speaker

Item # 15450306

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Our take on the Dynamat DynaBox

Provides an enclosure for a ceiling-mounted speaker

In-ceiling speakers have gotten really popular, and they're a great option for home theater systems. But much of the sound they produce can end up leaking into the room above. If you're enjoying a movie while someone in the bedroom above is trying to sleep... well, someone is going to lose some sleep. That's where Dynamat's ingenious DynaBox™ sound-isolating enclosure comes in.

Works for both new construction and retrofits

Installation summary

The flexible DynaBox can be folded to fit through an existing speaker opening. Then, you line the enclosure with the two supplied pieces of sound-absorbing foam.

The DynaBox acoustic barrier is very flexible — literally. The enclosure is made of flexible vinyl that allows it to be collapsed for easy retrofit installation. You actually fold the enclosure and push it up through the hole you've cut in the ceiling for your speaker. Once the box is in place, you line it with the two supplied sound absorbers: the SoundSnake acoustic decoupler and back-wave foam panel. Of course, the DynaBox works great for new construction, too. Click on "Details" for installation instructions.

Helps in-ceiling speakers sound clearer

The DynaBox creates an enclosure for your speaker, helping it project sound that's clearer and more controlled. You'll get more sound where you want it, and less noise and vibration where you don't.

Product Highlights:

  • sealed enclosure improves sound quality of a ceiling-mounted speaker
  • includes Back-wave foam piece and SoundSnake acoustic decoupler to absorb unwanted noise and control cabinet resonances
  • reduces the amount of sound and vibration passing through the ceiling
  • UL-rated
  • enclosure dimensions: 17"W x 12"L x 6-1/2"D
  • warranty: 60 days
  • Our 60-day money-back guarantee

What's in the Box:

  • DynaBox (rubber enclosure)
  • SoundSnake (two layers of foam)
  • Back-wave foam (egg-crate style foam)
  • Installation Instructions

Hands-on research

Product Research


Overview: DynaBox is a revolutionary acoustic barrier for in-ceiling speakers. DynaBox consists of a combination of flexible sound barrier vinyl, the SoundSnake acoustic decoupler, and noise absorbing back-wave foam. DynaBox completely encases the speaker, which effectively reduces sound migration between rooms, ceilings, & floors. DynaBox projects more clear sound into the room & reduces unwanted sound traveling outside the room.

DynaBox: DynaBox is a unique retro-fitable ceiling speaker enclosure that completely encases the speaker, effectively reducing sound migration between rooms, ceilings and floors.

  • Appearance: Black flexi-vinyl barrier
  • Color: Charcoal Gray
  • STC (Sound Transmission Class): 28
  • Mass: 1 lb per square foot
  • Material Thickness: 0.09"
  • Temperature Range (Resistance): -40°F to +220°F
  • Chemical Resistance: Resistance to water & mineral oils
  • Dimensions: 17" (w) x 12" (h) x 6.5" (d)

Back-wave Foam: The back-wave foam features an egg-crate style foam design with a self-adhesive backing. Its designed to adhere to the inside back of the DynaBox. The back-wave foam helps to absorb any unwanted noise.

  • Mass: 0.16 lb/ft²
  • Density: 2.0 lb/ft³
  • Tensile Strength: 15 psi
  • Thermal Conductivity (R): 1.9 (Hr-ft²-deg.F/BTU)
  • Standards: Meets UL94 HF-1
  • Temperature Range (Resistance): -40°F to +225°F
  • Dimensions: 13.5" (w) x 9" (h) x 1" (d)

SoundSnake: The SoundSnake is a two-layer acoustic decoupler which consists of Foam & Dynil. It's designed to go around the inside edges of the DynaBox. The SoundSnake works to prevent unwanted noise transfer outside the room while creating an optimal acoustic environment in the room.

  • Foam:
    • Thickness: 1.5"
    • Density: 2.0 lb/ft³
    • Tensile Strength: 15 psi
    • Thermal Conductivity (R): 1.9 (Hr-ft²-deg.F/BTU)
    • Standards: Meets UL94 HF-1
    • Temperature Range (Resistance): -40°F to +225°F
  • Dynil:
    • Appearance: Black flexi-vinyl barrier
    • Color: Charcoal Gray
    • STC (Sound Transmission Class): 28
    • Mass: 1 lb per square foot
    • Thickness: 0.09"
    • Standards: Meets UL94-V0
    • Chemical Resistance: Resistance to water & mineral oils
    • Temperature Range (Resistance): -40°F to +220°F

Note: Total dimensions of SoundSnake are 1.5" (w) x 5.5" (h) x 54" (long)

Installation Instructions: DynaBox features a flexible design which enables it to be completely collapsed for easy retrofit installation. DynaBox can also be installed in new construction.

  • Step 1 (Prep Box): Ensure the ceiling hole is cut to fit your in-ceiling speaker installation requirements. See your speaker installation instructions for complete directions & template. Using a razor knife, cut the DynaBox hole to fit your in-ceiling speaker, as well. If running speaker wires inside the box, cut a small slit on the side of the box to run wires (speaker wires can be run inside or outside of the DynaBox).
  • Step 2 (Insert Box): Tightly roll box with the hole on the inside. Grip box tightly and place through the existing ceiling opening. Expand box and position over ceiling opening.
  • Step 3 (Insert SoundSnake): Tightly roll the SoundSnake with the wider foam side toward the inside of the roll. Grip tightly and place through the existing ceiling opening in to the DynaBox. Expand and adjust to line the inside walls of the box. The smaller foam side of the SoundSnake should be toward the outside of the box.
  • Step 4 (Insert back-wave Foam): Remote the white paper backing from the back-wave foam. Fold in half with sticky side out. Place through opening and apply the self adhesive (sticky) side to the top of the box.
  • Step 5 (Seal Box): Apply a bead of contractors glue or silicon caulking around the outside perimeter of the DynaBox hole.
  • Step 6 (Install Speaker): Follow the manufacturer's instructions for your in-ceiling speaker installation.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.