SPECIFICATIONS
Type: Compact,two-way passive full range
Drivers: 　2×18" bass driver , 4"voice coil
Frequency Response 40Hz-180KHz(-3dB)
Power Handling: 2×550W
Sensitivity 104dB/1W/1m
Maximum SPL 134dB continue,140dB peak
Nominal impedance: 4 Ohms or2×8 Ohms
Connectors: 2×Neutrik NL 4
Dimensions: 1160×600×760mm(H×W×D)
Net Weight: 77kg

The UA280 is a 2x500-watt subwoofer loudspeaker system which combines the attributes of both horn-loaded and vented box designs. The UA280 design utilizes the unique double sub woofer cabinet construction with two 18″ woofers. The design be haves like a horn over much of its range, but without the time delay and weight problems usually associated with conventional designs. Vented-boxprinciples take over for the lowest octave and assist in producingexceptionally high levels of clean punchy bass from a modest-sized box. The reverse woofer orientation has been used to optimize the rear chamber volume and decrease the horn flare rate for extended low end performance.When used with the UA series module , the UA280 provides high-output sound reinforcement for clubs, large halls, or out door events in a compact package which can be moved easily by a two-person crew.Although the UA280 was designed for use with the UA system, it may be used to augment the bass performance of any Real-Acoustics stage system.