BITUMEX/FG4 Insulating heavy foil | 247 x 328 x 4,7 mm

The BITUMEX/FG4 Insulating Heavy Foil is a purpose-engineered damping solution designed to elevate the performance of your loudspeaker cabinets. Measuring 247 x 328 x 4.7 mm, this self-adhesive sheet effectively transforms resonant enclosures into acoustically inert structures, allowing your drivers to deliver cleaner, more accurate sound reproduction.

Ideal for both DIY speaker builders and those refurbishing existing cabinets, this heavy foil is particularly effective in mid-range and bass enclosures where unwanted vibrations can muddy the low end. It is equally suited for use in subwoofer boxes, bookshelf speakers, and even automotive audio installations where panel resonance compromises clarity. Simply cut to size, peel, and apply to internal cabinet walls for immediate results.

Constructed from a dense bitumen-based compound, the 4.7 mm thickness provides substantial mass loading to absorb and dissipate vibrational energy. The aggressive self-adhesive backing ensures a permanent bond to MDF, plywood, or metal surfaces, while the foil’s flexibility allows it to conform to curved or irregular panels. This material offers a high damping factor across a broad frequency range, targeting the problematic resonances that colour sound.

For a cost-effective upgrade that yields tangible sonic improvements, the BITUMEX/FG4 is a reliable choice. Its straightforward installation and proven performance make it an essential component for any serious audio project seeking to reduce cabinet colouration and enhance overall clarity.