Havsvåg BT

Ref: SKBT001-2C

Bass traps with an exclusive design, 300 x 300 x 600mm tiles.

Boxes of 2, 4 or 8 units, to cover up to 4 corners.

ZHFR acoustic foam, charcoal grey or garnet, self-extinguishing, E-d0 (EN 13501-1).

Selected options:
VAT included


What are they?

The HAVSVÅG BT bass traps (low frequency acoustic absorbers) are specially designed to be mounted in the corners of rooms, where the maximum sound pressure in the entire frequency range is produced. They are easy to install, inexpensive and extremely effective in reducing the low-frequency effects of the room resonant modes, commonly associated with the 'boomy effect' (low-frequency accumulation) that is often heard in untreated rooms.

They are made with our high performance ZHFR acoustic foam which has excellent sound absorption levels in a wide range of frequencies (broadband absorption). Their unique appearance is the perfect complement for accompanying acoustic treatments with the HAVSVÅG panels.

What is the application used for?

Specific treatment for controlling and reducing reverberation at low frequency in musical studios and minimising acoustic anomalies in rooms (boomy effect).

They are a basic part of acoustic kits, and when used in combination with the absorption panels, they create a complete, balanced acoustic set for room treatments.

Absorption treatment for: control rooms, recording studios, rehearsal rooms, dubbing booths, radio / TV studios, home cinema...

What is their format?

  • Corner bass traps of: 300mm x 300mm x 600mm
  • Colours: Charcoal or Garnet
  • Boxes of:
    • 2 units - Coverage = 2 corners (partial treatment)
    • 4 units - Coverage = 2 corners (complete)
    • 8 units - Coverage = 4 corners (complete)
  • Normal packaging:
    • 62cm x 32cm x 32cm (0.06m3 / 2 Kg.)
    • 62cm x 62cm x 32cm (0.12m3 / 4 Kg.)
    • (x2) 62cm x 62cm x 32cm (0.12m3 / 4 Kg.)

How much do I need?

The following table gives a rough guide of the estimated reverberation time (at 250Hz) depending on the size of the room and the number of bass traps installed.

Reverberation time using Havsvåg BT
    correct   acceptable**   excess / low
RT60 at 250Hz
Room without treat. *SKBT001-2
2 uts. BT
4 uts. BT
8 uts. BT
4m2 -- h=2.5m 1.81 0.91 0.61 0.37
6m2 -- h=2.5m 2.26 1.24 0.86 0.53
9m2 -- h=2.5m 2.81 1.67 1.19 0.75

* The results are obtained by estimation in a standard room with the following finishes: plaster walls and plaster ceiling, parquet floor, one window and a wooden door.

** The 'acceptable' result is suitable for rooms that contain additional furniture (curtains, carpets, bookcases, chairs with fabric upholstery, sofas...)

Physical properties

Technical Drawing

Description: Low-frequency acoustic absorber
Material: ZHFR acoustic foam
Composite: Flexible open-cell polyurethane
Colour: Charcoal grey or garnet
Density: 28 Kg/m3 (ISO 845)
Porosity: 3.5 L/min (ISO 4638)
Resilience: 40 % (ISO 8307)
Fire Rating:
  • Self-extinguishing (UNE 53127)
  • E-d0 (UNE-EN 13501-1)
Technical Drawing bass trap havasvåg BT

Sound absorption

Absorption coefficients in octave bands (ISO 354):

125 Hz250 Hz500 Hz1 kHz2 kHz4 kHz
0.93 1.24 1.22 1.14 1.10 1.13

* absorption coefficients in third octave are available in the data sheet.

Global coefficients:

NRC 1.15 (ASTM C423)
SAA 1.17 (ASTM C423-09a)
α mid 1.15 (DB-HR)


3D Model [.SKP]