Detail 01
4x4x24 inch triangular fill
Sits in the 90-degree corner seam. Each piece covers two feet of vertical run, so nine stack to about 18 feet.
Product detailSKU #1273887989296
Auralex4" CornerFill 4"x4"x24" 9-Pack Charcoal
Independent shopping perspective
The Korena take
Nine 4x4x24-inch charcoal foam corner blocks for treating wall-wall and wall-ceiling corners. For someone already treating a room who needs bass control.
Strong match
Who this is for
- Filling vertical wall corners in a small home studio
- Adding low-end control after flat panels are already up
- Treating ceiling-wall seams where bass builds up
Consider the trade-offs
When to look elsewhere
- Anyone expecting soundproofing or blocking noise between rooms
- Rooms with no other treatment — corners alone won't fix flutter echo
- Large rooms needing deep bass traps beyond 4-inch depth
What matters in use
The specifications, translated
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 02
9-pack quantity
Enough to run two full-height room corners floor to ceiling in a standard 8-foot room, with a few left over.
Detail 03
4-inch depth
Absorbs low-mid buildup where two walls meet. Deeper traps go lower; this targets the range above roughly 200Hz more strongly.
Detail 04
Foam construction
Light enough for adhesive or friction fit. It compresses, so it wedges into corners that aren't perfectly square.
Detail 05
Charcoal gray finish
Dark neutral that hides in an unlit corner. Foam can lighten over years of sun exposure.
Final check
Know before you order
- 01No adhesive, tabs, or mounting hardware included — buy separately
- 02Foam ships compressed and needs time to expand to full size
- 03Measure corner height first; nine pieces cover roughly 18 vertical feet
Product questions
Before you decide
Straight answers to the questions shoppers most often ask about this product.
01Will this stop my neighbors hearing my music?
No. Foam absorbs reflections inside the room. Blocking sound between rooms takes mass and sealed construction, which is a different job entirely.
02How many corners will nine pieces cover?
Each piece is 24 inches tall. An 8-foot corner takes four pieces, so nine covers two full corners with one spare.
03How do I attach it to the wall?
Nothing is included. Spray adhesive, mounting tabs, or construction adhesive all work. Adhesive can pull paint when removed.
04Does the color affect performance?
No. Charcoal is cosmetic only. Absorption comes from the foam density and the 4-inch depth in the corner.
Reference
Full specifications
The complete catalog record, organized around the decisions musicians make when comparing gear.
1 detailsBody & build
- Color Finish
- Gray
1 detailsSize & weight
- Dimensions
- 4 inch x 4 inch x 24 inch
