Single 21 inch bass subwoofer high end speaker

group name: SUBWOOFER SPEAKER

Min Order: 1 piece

brand name: Sinbosen| Audio sound system manufacturer

model: KA21

Nearest port for product export: Guangzhou, Yantian,Shenzhen, Shekou,Shenzhen

Delivery clauses under the trade mode: FOB, CFR, CIF, EXW, FAS, CIP, FCA, DDP, DDU, Express Delivery, DAF

Acceptable payment methods: T/T, L/C, D/P D/A, MoneyGram, Credit Card, PayPal, Westem Union, Cash, Escrow

update time: Mon, 03 Nov 2025 18:52:53 GMT

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Paramtents

Max SPL 138 dB
Low frequency limit 29 Hz
Transducers LF: 1 x 21"
Weight 49 kg / 108 lb
Directivity standard or cardioid configurations

Packging & Delivery

Min Order1 piece

Briefing

The KA21 progressive vent design, which greatly reduces turbulence and outlet noise , also improves low frequency efficiency.

Detailed

KA21 Specification
Low frequency limit (-10 dB)	29 Hz
Maximum SPL	138 dB
Nominal directivity (-6 dB)	Standard or cardioid configuration
Transducers	1 × 21″ neodymium cone driver
Acoustical load	Bass-reflex, progressive vent design
Nominal impedance	8 Ω
Connectors	2 × 4-point terminal block with push-in connection
Rigging and handling	External rigging kits
	Inserts for rigging plates etc.
	Threaded insert
Weight (net)	49 kg / 108 lb
Cabinet	FIrst grade Russian birch plywood
Front	Coated steel grill
Front	Acoustically neutral 3D fabric
Rigging components	High grade steel with anti-corrosion coating
Finish	Dark grey brown
Feature	Powerful
	Clear low-frequency
	Stringent rigging conditions

The KA21 is a compact subwoofer that can expand the frequency response bandwidth such as the A15.The KA21's progressive vent design, which greatly reduces turbulence and outlet noise when used at high output, also improves low frequency efficiency. First grade Russian birch plywood enclosure with Weather-resistant Polyurea paint,can withstand all kinds of friction and collisions.