Applications: Medium scale venues including stadium, concert hall, auditorium, theater, clubs, touring show, rental market etc. The B18A+ is a single 18" sub woofer designed to be flown with the A10+ Line Array System. The B18A+ can also be ground stacked and used with A10a+. which can be used in a several convenient configurations.(2+1 , 4+1 , 4+2,8+4) FEATURES:Powerful 1000 W sub woofer featuring a single 18" driver providing more surface area for strength and durability.Precision-made 18 mm high density plywood cabinet with a durable paint finish for touring and rental use.(Russia birch plywood is optional as request)Optimized cabinet structure designed to reduce unwanted resonances and airflow noise.Low frequency extends down to 40Hz (@ ±3dB).The LF frequency driver - designed and manufactured by Celestion in UK,Double Damper,more strong output.lighting in weight. The integrated rigging system has a 7:1 safety coefficient.Designed for touring outdoor concerts stadiums fixed installation and for all demanding sound reinforcement applications.Designed to be flown in LA110A+ Line Array Systems.The Class-D active amplifier design and manufactured by Denmark Pascal , inbuilt Italy DSP processor.Recommended for ground stacking with A10+ Passive Line Array to organized in a active line array system.Each unit attach four flight case wheels,easy to transport.Model B18A+Type 18 inch Active DSP-controlled Sub bass(2.1 mode )Frequency response 40Hz－250Hz ± 3dBPower Handing 1000W (RMS) 2000W (PEAK)Sensitivity 99dB(1W@1M)Max SPL(@1m) 130dB(PEAK/1M)LF driver 1 x 18" Bass(UK Celestion/Spain Beyma/Domestic optional)Denmark Pascal Amp 800w+800w+2500w@4ΩRMS;2.1mode,Inbuilt Italy DSPSpeaker cables LF 1(+)1(-)  HF 2(+)2(-)Connector 2×NL4MP SpeakonCabinet High Density plywoodDimensions(W x H x D) 565×740×705mm(W×H×D)Net Weight 54kg