The SBA-118 is a compact very high output permanent installation sub-bass loudspeaker employing an 18-inch long-excursion driver in an optimally tuned vented enclosure. It is an ideal choice for applications requiring precise transient response and low bass extension in a compact very high output package. The SBA-118 is frequently employed as a single unit or it can be used in multiples to create cardiod bass arrays. Its compact size fits well under stages, on stage and dimensionally matches the HLA20 in flown arrays.