Mocka BT

Ref: SKBT004-4G

Bass traps with a simple design, 300 x 300 x 600mm pieces.

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

Basotect® acoustic foam, colour: white or light grey; Fire class M1.

Selected options:
VAT included


What are they?

The MOCKA BT bass traps (low frequency acoustic absorbers) are specially designed to be mounted into the corners or the edges of rooms, their smooth profile is specially designed to complement the absorption at low-frequencies in acoustic treatments with MOCKA tiles or MOLN panels. They are 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 of fireproof acoustic foam Basotect®, which has a high sound absorption performance, better durability and the best fire-resistance: Class 1. Mocka BT has excellent sound absorption levels in a wide range of frequencies (broadband absorption).

® Registered trademark of BASF SE


This Basotect foam bass trap has a Class 1 (BS 476/7) fire resistance (fireproof).
It is a product suitable for installation in public establishments.

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).

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

What is their format?

  • Corner bass traps of: 300mm x 300mm x 600mm
  • Boxes of:
    • 4 units - Coverage = 2 corners
    • 8 units - Coverage = 4 corners
  • Normal packaging:
    • 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 Mocka BT bass traps installed.

Reverberation time using Mocka BT
    correct   acceptable**   excess / low
RT60 at 250Hz
Room without treat. *SKBT004-4
4 uts. BT
8 uts. BT
4m2 -- h=2.5m 1.81 0.61 0.37
6m2 -- h=2.5m 2.26 0.86 0.53
9m2 -- h=2.5m 2.81 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: Broadband acoustic absorber
Material: Basotect® G acoustic foam
Composite: Flexible open-cell melamine resin
Colour: White or Light grey
Density: 9 Kg/m3 (ISO 845)
Compression resist.: 5-10 kPa (ISO 3386-1)
Traction resist.: >90 kPa (ISO 1798)
Fire Rating:
  • B1 (DIN 4102-1)
  • M1 (NF P 92-507)
  • Clase 1 (BS 476/7)
Technical Drawing bass traps Mocka 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]