Does the subwoofer support adjustable directivity?

Yes, it supports standard or cardioid configuration to ensure excellent frequency response stability.

What certifications does the product have?

The product is certified with CE and RoHS.

What is the frequency response range?

The frequency response ranges from 60Hz to 18kHz.

Ka21 Neodymium Magnet 21 Inch DJ Passive Speaker Subwoofer

Name: Ka21 Neodymium Magnet 21 Inch DJ Passive Speaker Subwoofer
Brand: Guangzhou Xinbaosheng Audio Equipment Co., Ltd.
SKU: 2282497255

Guangdong, ChinaGuangzhou Xinbaosheng Audio Equipment Co., Ltd.

US$700.00-800.00

1 Piece

Product profile

Customization

Available

Noise

<102dB

Hi-Fi

Model NO.

KA21

Activity

Passive

Operation Mode

Wire / Remote Control

Speaker System

Optional Combination

Speaker Material

Wood

Application

Commercial, Home, Stage, KTV, Professional Performance

Certification

CE, RoHS

THD

0.005%-0.01%

Type

Subwoofer Speaker

Driver Lf

21"×1(Neodymium φ75mm)

Frequency Response

60Hz-18kHz

Rated Power

800W

Peak Power

1800W

System Sensitivity

138db

Impedance

8ω

Net Weight

49kg

Wood Case

High Quality Brich Plywood, Surface Coating

Special Service

OEM Service Offered

Transport Package

Strong Wooden Frame and Carton

Specification

343× 379× 595

Trademark

Sinbosen

Origin

Guangdong Province, China

HS Code

85182200

Production Capacity

1000 Units/ Month

Key features

Deep Bass Performance: Delivers powerful low-frequency response with a 21-inch neodymium driver and 29Hz limit.

High Power Handling: Rated at 800W with a peak power capacity of 1800W for professional events.

Premium Cabinet Material: Constructed from first-grade Russian birch plywood with waterproof polyurea paint.

Adjustable Directivity: Features standard or cardioid configuration to cover specific audience areas.

OEM and Customization: Offers full customization, design-based customization, and flexible customization options.

Robust Rigging System: Includes high-grade steel rigging components with anti-corrosion coating for safe handling.

Low Distortion Audio: Achieves ultra-low THD of 0.005%-0.01% for Hi-Fi sound quality.

Fast Lead Time: Average production lead time is within 15 workdays for both peak and off-seasons.

Company profile

High Repeat Buyers ChoiceYears of Export Experience

Guangzhou Xinbaosheng Audio Equipment Co., Ltd.

Guangdong, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 10 Years CertifiedNearest Port: Guangzhou PortAverage Response Time: ≤4.81h

AI-Powered supplier vetting

SummarySinbosen demonstrates broad customization and ODM capability, has introduced new products within the past year, and reports RoHS compliance. It offers small orders and customized samples, a stated three-year warranty, 18-hour service availability, and free after-sales support for quality or product problems. Production indicators include seven production lines, six to ten quality-control staff, inventory capability, and lead times within 15 working days in both peak and off-season periods. However, the supplier has no valid manufacturing-capacity contract with related subcontractors, no supplier management-system certification, no overseas warehouse, overseas branch or agent, showroom, or offline trade-show participation. Inspection and supplier-assessment procedures exist without records, and approved-supplier lists lack signatures or dates. Financial information is present only as year labels, so financial credibility cannot be verified. Customer-case evidence is limited: no Fortune 500 cooperation or...

Supplier typeThe supplier presents itself as a manufacturer with R&D, ODM, customization, inventory, and seven production lines. It exports mainly to Europe and North America, but has no overseas warehouse, branch, agent, showroom, or overseas-service country coverage.

CertificationsRoHS is explicitly identified as the supplier’s sustainable-development and product-compliance certification. However, supplier management-system certification is listed as NIL, so certification coverage is limited to the stated product-related standard.

After-Sales capabilityThe supplier states that it provides a three-year warranty, welcomes small orders and customized samples, offers 18-hour online service, and provides free after-sales support for quality or product problems. These are explicit service commitments, although no performance records are provided.

R&D capabilityThe supplier reports new products within the past year, ODM service, and broad design customization. It has two years of total R&D-engineer experience and no available SDK, indicating some product-development capability but limited evidence of advanced technical integration.

Production capacityProduction evidence includes seven production lines, six to ten quality-control staff, inventory capability, 30 qualified service-capability suppliers, and lead times within 15 working days in peak and off-season periods. A material control weakness is that no valid manufacturing-capacity contract exists with related subcontractors, while inspection and supplier-assessment procedures lack records.

Customization capabilityThe supplier explicitly supports customization from samples, full customization, customization from designs, minor customization, flexible customization, ODM services, and customized samples for small orders. This is direct evidence of broad customization flexibility.

Client casesThe supplier reports no OEM service for popular brands and no cooperation with Fortune 500 companies. No named customers, project examples, or verifiable case studies are provided, so customer-case strength cannot be established.