The Citronic CASA-28BA is a compact active subwoofer cabinet designed to enhance a full-range sound system by providing powerful sub-frequencies and transients. It is suitable for various sound reinforcement applications, including PA stacks when paired with a full-range or mid-top cabinet.
Function Description:
The CASA-28BA is an active subwoofer, meaning it has a built-in amplifier. It receives a line-level audio signal from a mixer or other audio source and amplifies the low frequencies, outputting them through its two 8-inch woofers. The internal DSP (Digital Signal Processor) ensures optimal performance by filtering to produce only low frequencies with controlled dynamics. The unit also features a line output, which is unaffected by the internal DSP, allowing for daisy-chaining to other active cabinets (full-range or sub).
Important Technical Specifications:
- Power Supply: 230Vac, 50Hz (IEC)
- Construction: 15mm MDF with a durable texture paint finish.
- Hardware: Integral carry handle and a 35mm pole mount socket for mounting a full-range or mid-top speaker.
- Amplifier: Class-D
- Drivers: 2 x 200mmØ (8") woofers
- Frequency Response: 55 - 150Hz
- Output Power (RMS): 400W
- Output Power (Max.): 700W
- Peak Output: 1400W
- SPL Max.: 122dB
- Dimensions: 475 x 450 x 250mm
- Weight: 15.7kg
Usage Features:
- Inputs and Outputs:
- Line Input: Combo XLR / 6.3mm jack for balanced line-level signals (0.775Vrms @ 0dB).
- Line Output: Balanced XLR, unaffected by the internal DSP, for daisy-chaining to other active cabinets.
- Controls:
- Output Level Control: Adjusts the overall output volume of the subwoofer. It is recommended to start with this control fully down when connecting and powering on the unit.
- Phase Switch (0°/180°): Helps to correct phase cancellation issues that can occur between different speakers, especially subwoofers, due to the long wavelength of lower frequencies. This can also help avoid feedback with certain microphone placements.
- Boost Switch: Adds a pre-set increase to the CASA-28BA's output. It is advised to turn down the output level control before engaging this switch at high volumes to prevent damage.
- Power On/Off Switch: Controls the main power to the unit.
- Indicators:
- POWER LED: Illuminates when the unit is powered on.
- SIG LED: Lights periodically in sync with the audio signal when the subwoofer is playing at normal levels.
- CLIP LED: Lights up when the audio level exceeds normal levels, indicating that the amplifier is "clipping" the signal, which can lead to aggressive and distorted output and potential damage to the subwoofer drivers. If this LED lights up more than momentarily, the output level should be reduced.
- Placement:
- For maximum sound delivery, the subwoofer should be positioned with its back close to a solid wall or in a corner of the room.
- It can be stood upright for a minimal footprint or on its side, utilizing the 35mm pole socket for a PA stack.
- It's important to position the cabinet on a stable surface capable of supporting its weight and handling vibrations.
- Adequate space should be allowed for cooling and access to the rear controls and connections.
- The unit should be kept away from direct sunlight, heat sources, damp, and dusty environments.
- To avoid feedback, the subwoofer should be aimed towards the audience and not in direct line of sight with microphones. Microphone stands should also be kept away from the subwoofer to prevent vibration transfer.
Maintenance Features:
- Cleaning:
- Surfaces of the cabinet can be cleaned with a soft, dry, or slightly damp cloth.
- A soft brush can be used to clear debris from controls and connections without causing damage.
- Solvents should not be used to clean any parts of the cabinet.
- Safety:
- The unit must be earthed.
- To prevent the risk of fire or electric shock, the unit should not be exposed to rain or moisture.
- Avoid impact to any components.
- No user-serviceable parts are inside; all servicing should be referred to qualified service personnel. Attempting to fix or modify the unit will invalidate the warranty.
- Ensure the correct mains lead with adequate current rating and mains voltage (230Vac, 50Hz) is used.
- In case of liquid ingress, immediately stop using the unit, allow it to dry, and have it checked by qualified personnel.
- Disposal: The product is classified as Electrical or Electronic equipment and should not be disposed of with household or commercial waste. It must be disposed of according to local council guidelines.
The CASA-28BA is designed for ease of use and robust performance, providing a powerful low-frequency foundation for any sound system.
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