Exceptional Low-Frequency Reinforcement for Professional Sound Systems
The d&b audiotechnik J-INFRA is a large-format cardioid infra subwoofer designed for professional sound reinforcement systems that require powerful, controlled low-frequency reproduction. Developed as part of the d&b J-Series, it is intended to complement compatible J8, J12, and J-SUB loudspeaker configurations by extending the system’s frequency response into the deepest bass region.
For concert production companies, touring professionals, sound rental businesses, festival organizers, and large-venue audio specialists, the J-INFRA offers a dedicated solution for applications where low-frequency impact and bass control are important parts of the overall sound experience.
Unlike a conventional full-range loudspeaker, an infra subwoofer concentrates on the lowest frequencies. This specialized role makes the J-INFRA particularly relevant to large-scale live music, electronic music productions, outdoor festivals, and demanding professional sound reinforcement environments.
Three 21-Inch Drivers for Deep Bass
The d&b audiotechnik J-INFRA incorporates three 21-inch drivers in a large-format enclosure designed for high-output low-frequency performance. Its published standard frequency response extends from 27 Hz to 60 Hz, with an alternative 70 Hz mode extending the upper operating range to 70 Hz.
This low-frequency operating range allows the J-INFRA to supplement compatible loudspeaker systems with additional infra-bass reproduction. When appropriately integrated with the main PA and other subwoofers, it can contribute depth and impact to the overall system response.
Low-frequency performance depends on more than the subwoofer itself. System configuration, placement, amplifier processing, crossover settings, room acoustics, and the interaction between multiple cabinets all influence the final result. Professional system design is therefore essential to achieving the intended bass response.
Cardioid Design for Better Bass Control
A defining feature of the d&b audiotechnik J-INFRA is its cardioid acoustic configuration. The enclosure uses two forward-facing 21-inch drivers and one rear-facing driver, powered through separate front and rear amplifier channels.
This arrangement is designed to reduce unwanted low-frequency radiation behind the subwoofer, helping improve control over the bass energy directed toward the audience and the surrounding environment. The manufacturer’s Hypercardioid mode provides an alternative tuning approach for optimizing rejection toward the sides and rear.
For live productions, managing low-frequency energy can be especially important on stages, in large venues, and at outdoor events where excessive rearward bass may affect performers or contribute to unwanted acoustic buildup.
The actual directional behavior depends on correct processing, placement, operating mode, and the surrounding acoustic environment. Proper configuration by an experienced audio technician is recommended.
Designed for the d&b J-Series
The J-INFRA is intended to supplement compatible d&b J-Series systems, including configurations built around the J8, J12, and J-SUB. It allows system designers to incorporate dedicated infra-bass reinforcement when the production calls for additional low-frequency extension.
Unlike some conventional subwoofers, the J-INFRA is designed for ground-stacked deployment rather than suspension. Its position and orientation should be planned as part of the complete PA design, following manufacturer guidance.
The subwoofer requires compatible d&b amplification and appropriate processing. Buyers should verify the amplifier model, required cabling, connection assignments, and operating configuration before integrating it into an existing inventory.
Professional Applications and Rental Opportunities
The d&b audiotechnik J-INFRA is suited to demanding professional applications, including:
- Large-scale concerts and live music productions
- Electronic music events and festivals
- Touring sound reinforcement systems
- Outdoor entertainment and public events
- Large venue PA installations and productions
- Professional audio rental and production inventories
For sound rental companies, specialized infra subwoofers can provide an additional option for productions that require extended low-frequency response. Their value depends on the types of events served, the compatibility of the existing PA inventory, and the ability to transport, deploy, and power the equipment correctly.
Construction and Professional Handling
The J-INFRA features a large-format cabinet constructed from marine plywood with a protective PCP polyurea finish. Protective metal grilles and integrated handles support professional handling in demanding production environments.
At approximately 152 kg, the J-INFRA is substantial equipment that requires suitable transportation, adequate handling procedures, and appropriate ground placement. Buyers should consider transport dimensions, loading access, storage, and the availability of suitable crew and equipment when planning deployments.
When purchasing, inspect the cabinet, drivers, connectors, protective finish, and available documentation. For used equipment, confirm operating condition and request details of any repairs or maintenance.
Price and Purchasing Information
The d&b audiotechnik J-INFRA is offered at €4,000 per unit. It is an option for professional buyers seeking dedicated infra-bass reinforcement for compatible J-Series sound systems.
Before ordering, confirm availability, condition, included accessories, shipping arrangements, and payment terms. Verify the necessary amplification and processing requirements, and ensure that your intended system configuration follows the manufacturer’s recommendations.
Choose the d&b audiotechnik J-INFRA when your professional sound system requires dedicated deep-bass reinforcement, cardioid low-frequency control, and integration with compatible d&b J-Series equipment.
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