Bass Trap Corner Fill Acoustic Studio Foam

Professional recording studios and control rooms — tri-corner low-frequency control.
The Bass Trap Corner Fill addresses the tri-corner — the junction where two walls and the ceiling meet — which is the point of greatest low-frequency energy accumulation in a room. Standard 2ft and 3ft corner bass traps treat the vertical and horizontal corners; the Corner Fill completes the treatment by addressing the tri-corner itself. Install at the top of stacked vertical corner traps to complete the corner treatment into the tri-corner junction. The cube format integrates with the 12" bass trap range for a coordinated corner treatment package. Use the Coverage Calculator to determine the number of Corner Fills required.

Home studios and rehearsal spaces — tri-corner treatment.
The Bass Trap Corner Fill provides targeted tri-corner treatment for home studios and rehearsal rooms where low-frequency reverberation is a problem. The cube format is practical for smaller room dimensions and integrates with 12" bass trap installations to complete the corner treatment. The Corner Fill can be used alongside any Advanced Acoustics wall tile family for a coordinated acoustic treatment package.

Coordinated treatment with 12" bass trap range.
The 305mm cube format is designed to integrate with the 12" corner bass trap range — sitting at the top of stacked vertical 2ft or 3ft corner traps to complete the corner treatment into the tri-corner. The matching 305mm footprint ensures a consistent visual finish across the full corner installation.

Tri-corner low-frequency control — Equivalent Absorption Area 0.6 at 100Hz and 125Hz.
The Bass Trap Corner Fill provides targeted absorption at the lowest frequencies in the room — the tri-corner where low-frequency energy is greatest. Equivalent Absorption Area per object: 0.1 at 50Hz, 0.2 at 63Hz, 0.2 at 80Hz, 0.6 at 100Hz, 0.6 at 125Hz, and 0.5 at 160Hz. The 0.6 at 100Hz and 0.6 at 125Hz deliver the strongest absorption in the measured range, targeting the very low frequencies where corner bass traps and wall tiles are less effective. The Corner Fill is the appropriate specification where tri-corner treatment is required to complete a comprehensive corner installation.

Cube format — tri-corner integration.
The 305mm cube format is designed to fit the tri-corner geometry — the junction where two walls and the ceiling meet. The cube sits at the top of stacked vertical 12" corner bass traps, completing the corner treatment into the tri-corner. The format integrates with the 12" bass trap range for a consistent visual finish across the full corner installation.

Specification and compliance.
30kg/m³ foam density. Crib 5 and Schedule 1, Part 1 of the Furnishings and Furniture (Fire)(Safety) Regulations 1988 (amended 1989). Bass trap size 305mm × 305mm × 305mm (12" × 12" × 12"). 0.8kg per trap. 1sqft (0.07m²) face area. Mid Grey and Dark Grey. Manufactured in the UK and shipped uncompressed from stock.

Install the Bass Trap Corner Fill in the tri-corner — the junction where two walls and the ceiling meet — where low-frequency energy accumulation is greatest. The cube is designed to sit at the top of stacked vertical 12" corner bass traps, completing the corner treatment into the tri-corner. Fix using Advanced Acoustics Contact Adhesive applied to the rear face of the cube and the tri-corner surfaces. Allow the adhesive to become touch-dry before bringing the surfaces together — contact adhesive bonds on contact, so position the cube carefully before pressing it into the tri-corner. Ensure adequate ventilation throughout installation — the adhesive is solvent-based.

If I buy a corner kit, do I need to buy the Corner Fill separately?

No. Every Bass Trap Corner Kit includes one Corner Fill alongside the three 3ft traps, so a kit treats one tri-corner without anything extra. The standalone Corner Fill is for adding to traps you already own or for completing a corner you've built yourself.

Can I add a Corner Fill to bass traps I already have?

Yes. The 305mm cube sits at the top of stacked vertical 12" corner traps and completes the corner into the tri-corner. It matches the footprint of the 2ft and 3ft Wedge, Wave, Quadrant and Original traps. It is available in Mid Grey and Dark Grey, so choose the same colour as your existing traps.

How much will a single Corner Fill actually do?

For its size, quite a lot. One cube measures 0.6 at 100Hz and 125Hz, which is comparable to a 3ft trap at those frequencies (0.5–0.7 at 100Hz, 0.6–0.7 at 125Hz depending on profile). It is weaker at 160Hz (0.5 against 0.9 for a 3ft). It is designed to complete a corner treatment rather than replace the traps, so it works best alongside them.

Which bass traps does the Corner Fill work with?

It is designed for the 12" (305mm) range: the 2ft and 3ft Wedge, Wave, Quadrant and Original bass traps. It will not pair with the MAXXX, which is a larger 610mm trap. Use one Corner Fill per tri-corner you're treating.

What if it doesn't make the difference I expected?

All products carry a 30-day money-back guarantee. A single piece treats one spot, so the effect depends on how many corners are covered. Contact us with your room dimensions and a photo and we'll advise on the layout before you decide whether to return anything. Call 01623 643609 or email info@advancedacoustics-uk.com.

Performance Data