The starting point
A cardioid subwoofer system needs a supported combination of cabinets, placement and processing. Establish the direction you want to reduce sound, the useful frequency range and the physical space available. Use a model-specific design and verify it on site instead of simply rotating a cabinet.
State the objective and the physical limits
Start with the reason for directional control. You may want less low-frequency sound toward the stage or in another defined direction, while retaining useful coverage for the audience. Draw both areas on the site plan. Include stage access, barriers, audience positions and the space actually available for the cabinets.
A directional label does not guarantee a particular result across every frequency or position. Ask what performance information is available for the documented arrangement and how it applies to your site. Keep the listening area and the area of intended reduction in the same design conversation.
Distinguish cabinet design from array arrangement
Some products implement directional behaviour within a cabinet or a defined factory configuration; other arrangements combine several cabinets with specified placement and processing. These are different proposals. Identify which one is being quoted and obtain the model-specific setup instructions.
For a multi-cabinet arrangement, the cabinet orientation is only one variable. Spacing, delay, polarity, filtering and relative level can all be part of the supported design. Do not copy settings from an unrelated system or assume that any subwoofer can use any advertised layout. Mechanical compatibility and safe placement also remain separate requirements.
Include integration with the main system
The subwoofer design must work with the main loudspeakers in the intended audience area. Ask who will establish crossover behaviour, alignment and overall levels, and what measurement access is needed during commissioning. A directional subwoofer arrangement does not by itself resolve the timing relationship to the rest of the PA.
The real stage, room and surrounding structures can influence the result. Allow time to evaluate the installed configuration at relevant positions, including the area where reduction is intended. Keep a record of the accepted layout and settings so a later setup can reproduce the configuration that was assessed.
Request a documented proposal
If a supplier provides a rear-rejection figure, keep its frequency range, measurement conditions and configuration attached. A number without those conditions is not a complete acceptance criterion. Avoid promising a quieter site boundary from a generic catalogue statement.
- Exact subwoofer model, quantity and active or passive configuration.
- Supported arrangement, spacing, orientation and required clearances.
- Amplifier channels, processor, presets and any required firmware.
- Intended operating range and supplied prediction or measurement basis.
- Integration with the mains and the person responsible for alignment.
- Placement, physical security, cable routes and site access.
What to include in a YL enquiry
Send a plan of the stage and audience area, the available subwoofer positions, the programme and the cabinets or electronics already in use. Explain where sound reduction is desired and identify the practical placement limits. Request a configuration that can be checked model by model, with processing and commissioning responsibilities included in the proposed supply.
Common questions
Does turning one subwoofer backwards create a cardioid array?
Orientation alone does not establish a functioning cardioid arrangement. Use the documented geometry and processing for a supported combination, then measure the installed result.
Can a cardioid layout eliminate all bass behind the stage?
Do not assume complete cancellation across all frequencies and positions. Ask for the documented performance and assess the actual installed arrangement.
Ready to apply this to your project? Share the model shortlist and the details you have gathered.