Ported The rock speaker is designed ported to provide a rich bass for outdoors. Temperature Range The speaker is designed to handle a very wide temperature range of 9 Cº / 13 F to +72Cº /160F. Dual Voice-Coil The dual voice coil feature allows both left and right channel sound from just one speaker.	NS-ROCK S/T/G 2-way Bass reflex The NS-ROCK is a quite unique model in the popular series of Indoor/Outdoor speakers. The NS-ROCK has the shape of an actual rock, which makes this speaker ideal for a private garden environment, in the backyard, or by the pool. The Rock is also to be seen and heard in public parks and theme parks around the world. The Rock is hand-made, and it is available in three different colors to blend in with different environments. This Rock will sing in rain and snow, as well as in hot sunshine! The Rock is provided with a 6" woofer in a ported construction for rich sound. Also, it features the advanced Dual Voice-Coil design (DVC). DVC allows 2-channel sound from each speaker individually, making both great sound and flexible placement possible. TECHNICAL DETAILS NS-ROCK System: 2- Way Bass reflex Woofer (inch): 6½ Tweeter (inch): 2 x ½ Sensitivity (dB - 2,8V / 1m): 89 Impedance (Ohm): 8+8 Ohm Weight (kg/lb): 7.4 / 16.31 Dimensions (HxWxD/mm/in): 381 x 286 x 235 / 15 x 11.26 x 9.25 Power Long Term: 2 x 50 Power Short Term: 100 Sound Barometer: 3 IR Knockout: 0 X-Over: 12 Total Volume: 25.6 / 0.9