Sturdy Plywood Housing. Anti-Scratch Powder Coating. 15" Custom Woofer with 4" Voice Coil. Speakon Input and Output. Recessed Handles. Pole Mounting with M20 ThreadPower: 600W Impedance: 8 Ohm Connection: Speakon Driver: 15" Bass SPL: 127dB Frequency Range: 35Hz-1kHz Dimensions: 460 x 610 x 565mm Weight: 32.5Kg. The Hyper15PB is a passive subwoofer with bass-reflex that is compact- lightweight and very easy to use. It is ideal for both fixed installations and live music events or PA. The sub has an RMS power of 600W with a 15" professional custom woofer. This model has a sturdy yet lightweight and elegant plywood housing with metal grille and acoustic foam to protect the transducers inside. It also has 2 recessed handles (1 on each side) and a standard M20 mounting hole.. passive subwoofer-passive speaker-subwoofer-loudspeaker