21 Inch Subwoofer Bass Speaker Box

Product Description

Features:
The U121B is a single 21'' low frequency enclosure designed for sub-bass reinforcement to U compact series. 1.High quality plywood
2.Compact Vented sub-bass
3. Direct radiating 21''(530mm) woofer
4. High temperature 5''(125)voice coil
5. Top Hat Fitting for pole mounting
Applications:
1.Multi-purpose Halls
2.High-end Hotels
3.Clubs
4. Live Sound Reinforcement
5. Stage Monitor
Detailed Images




Main Product Introduction:
1.Line Array System: LA series
2. Monitor System : MR series
3. PA two-way loudspeaker system: U series,QS series, FT series
4. Multi-purpose MINI System: MINI series
5. Column system: K series
6. Plastic system: CX series
7. Long through system: LT series
8. Karaoke sytem: IW series, PR series and KW series
9. Active Series: KS and U Active series
10. Electronice products: amplifier and processor
Factory Introduction:
FDB Audio Manufacture Co., Ltd is specialized in researching, developing and manufacturing in PRO audio products. The main products are professional transducers(HF driver & woofer), speaker cabinets and electronic products like amplifiers and processors.
FDB Audio adopts the world' S top-aided software and advanced techonoloy, owns advanced production equipments and testing apparatus, establishes cooperation development mechanisms with a number of world top grade materials and accessories manufacturers. Some important materials are imported from abroad, like voice coil, diaphragm and paper cone.
FDB Audio has established and strictly enforced the standard quality management system in accordance with ISO 9001: 2008. "Strictly enforce sound processes and standards, full quality control and customer satisfaction" is the quality policy.
Mr. Harry Xia is the boss of FDB Audio, graduated from Physical department of Zhenzhou University. He is engineer, has done proaudio district more than 20 years. He once worked for R&D department of the state-run speaker factory in Henan province about 3 years after graduating university, then worked for a Taiwan speaker factory in Guangdong about 2 years. After that, he joined Elder Audio as the sole engineer, factory manager and also one shareholder of this factory, once cooperated with BOSE, Thoman and Proel, they developed new models together. He worked for Elder audio about 9 years, quitted by the end of 2005 and established FDB Audio in Jan of 2006.
During 9 years effort, FDB Audio has gained good feedbacks from local and overseas market. The customers said " The quality is very stable, reliability and consistency are very good".
Factory Pictures:
Factory Contacts:
Tel: 0086-(0)769- 22781217-826
Direct:0086-(0)769-89820683
Fax: 0086-(0)769-22781297
Web: fdbaudiochina.en.made-in-china.com
Warmly welcome OEM & ODM business !

FREQUENCY RESPONSE(-3dB)	35Hz-300kHz
DRIVERS	1×21"(530mm)/5"voice coil LF
RATED POWER	1000W RMS,4000W peak
SENSITIVITY	100dB 1 watt/1 meter
MAXIMUM SPL	130dB continuous,136dB peak
IMPEDANCE	4 ohms nominal
PACKING SIZE	790x890x695mm
NET WEIGHT	51kg/pc
GROSS WEIGHT	57.3 kg/pc