Once a product establishes itself as being the answer to a problem, users will always want to extend the problem solving qualities of that product. To that end, Esmono responded by producing a more innovative version featuring thicker walls in order to accommodate the additional sound absorbing materials necessary to better the low frequency performance. Panels now contain 4 components, 2 blocks of sound absorbing material, a sheet or plasterboard and another block of fleece covered sound absorbing material. Low frequencies have great energy so are more difficult to absorb. The comparison between the air moved by a bass driver loudspeaker and a tweeter illustrates the point. Panel widths are 429mm wide. There are 8 standard size options. Most have 2 additional options, the height, 2m high rooms are favoured where the occupants are sitting down. Vocal booths are identical to isolation rooms. Wall and ceiling panels and all joining and supporting times, ducted ventilation system with an internal fan are included in each room/booth.