If you've never tried a 15" guitar speaker before, you may be missing out. The Beryllium Cab is a lightweight, portable, open back speaker cabinet with one fifteen inch speaker offering a rich, three dimensional sound. Solid pine construction and open back harken back to the golden era of American guitar amplifiers. The Eminence Wheelhouse 200 speaker, with its light weight neodymium magnet and hemp speaker cone, boasts a rich, midrange heavy sound in a powerful, lightweight package.