Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your JBL Professional Control 28-1L High-Output 8-Ohm Indoor/Outdoor Background/Foreground Speaker. Designed for versatile applications, these speakers deliver high-quality audio in various environments, from residential patios to commercial venues. Please read this manual thoroughly before use to ensure optimal performance and longevity of your speakers.
Figure 1: JBL Professional Control 28-1L Speakers (Pair)
Important Safety Information
- Read Instructions: Retain these instructions for future reference.
- Heed Warnings: Follow all warnings on the product and in the operating instructions.
- Water and Moisture: Do not use this apparatus near water. While weather-resistant, direct exposure to heavy rain or submersion should be avoided.
- Cleaning: Clean only with a dry cloth.
- Ventilation: Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
- Heat: Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
- Mounting: Use only with mounting hardware specified by the manufacturer. Ensure mounting surfaces are structurally sound to support the speaker's weight.
- Servicing: Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
What's in the Box
Each JBL Professional Control 28-1L speaker package includes:
- Control 28-1L Speaker (Sold as a Pair)
- Built-in InvisiBall Mounting Hardware
Note: U-brackets for mounting are sold separately.
Setup and Installation
Mounting
The Control 28-1L speakers feature built-in InvisiBall mounting hardware for secure and flexible placement. This system allows for vertical and horizontal rotation, making precise aiming straightforward. An optional U-bracket (sold separately) can also be used for alternative mounting configurations.
These speakers can be mounted to a wall, ceiling, or post. Always ensure the chosen mounting surface is capable of supporting the speaker's weight and that all fasteners are securely tightened to prevent accidental detachment.
Figure 2: Single JBL Control 28-1L Speaker
Wiring
The Control 28-1L is an 8-ohm (low-impedance) speaker, ideal for smaller system applications and shorter cable runs. Connect the speaker to a compatible amplifier using appropriate gauge speaker wire. Ensure correct polarity (+ to + and - to -) for optimal sound reproduction.
- Impedance: 8 Ohm
- Power Handling: 120 Watts (continuous program), 240 Watts (peak program)
For larger systems requiring 70V/100V constant voltage, refer to the Control 28-1 model, which includes a multi-tap transformer.
Operation
Speaker Placement
The Control 28-1L speakers are designed for broad coverage (100° x 100°), making them suitable for various indoor and outdoor settings. For optimal sound distribution, consider the acoustics of your space and aim the speakers to cover the desired listening area. Their weather-resistant design allows for flexible placement in environments where exposure to elements is a factor.
Powering the Speakers
Connect the speakers to an amplifier capable of delivering sufficient power without exceeding the speaker's rated power handling. The Control 28-1L can handle 120 watts of continuous program power (240 watts peak) at 8 ohms. Using an amplifier with adequate headroom is recommended to prevent clipping and potential speaker damage.
Maintenance
The JBL Professional Control 28-1L speakers are built with weather-resistant components and enclosures, making them durable for both indoor and outdoor use. To maintain their appearance and performance:
- Cleaning: Periodically wipe down the speaker enclosures with a soft, damp cloth to remove dust and dirt. Avoid using harsh chemicals or abrasive cleaners.
- Inspection: Regularly inspect mounting hardware for any signs of loosening or corrosion, especially in outdoor installations. Tighten as necessary.
- Environmental Considerations: While weather-resistant, prolonged exposure to extreme conditions (e.g., direct saltwater spray, extreme temperatures) may accelerate wear. Consider protective covers if speakers are in highly exposed areas during off-season periods.
Troubleshooting
If you experience issues with your JBL Professional Control 28-1L speakers, refer to the following common troubleshooting steps:
- No Sound:
- Check all cable connections from the amplifier to the speakers. Ensure they are secure and correctly wired (positive to positive, negative to negative).
- Verify the amplifier is powered on and functioning correctly. Test with another known-good speaker if possible.
- Check the audio source (e.g., mixer, media player) to ensure it is sending a signal.
- Distorted Sound:
- Reduce the volume level on your amplifier and audio source. Distortion often occurs when the amplifier is overdriven (clipping).
- Ensure the amplifier's impedance matches the speaker's 8-ohm rating.
- Inspect speaker cones for any visible damage.
- Intermittent Sound:
- Check for loose or corroded wire connections at both the speaker and amplifier terminals.
- Ensure speaker wire is not damaged or pinched.
If these steps do not resolve the issue, please contact JBL Professional customer support or a qualified service technician.
Specifications
Detailed technical specifications for the JBL Professional Control 28-1L speaker are provided below. For comprehensive diagrams and performance graphs, please refer to the official spec sheets.
| Model Name | CONTROL 28-1L |
| Speaker Type | Satellite |
| Mounting Type | Wall Mount, Ceiling Mount |
| Woofer Diameter | 8 Inches |
| Tweeter Diameter | 1 Inches |
| Impedance | 8 Ohm |
| Wattage (Program) | 240 Watts |
| Frequency Response | 45 Hz – 20 kHz |
| Coverage Angle | 100° x 100° |
| Product Dimensions | 8.6"D x 11.1"W x 15.2"H |
| Item Weight | 16.6 Pounds |
| Color | Black |
| Weather Resistance | True (Water Resistant) |
Detailed Spec Sheets
For in-depth technical data, including frequency response graphs and mounting dimensions, please refer to the following official spec sheet pages:
Spec Sheet Page 1
Spec Sheet Page 2
Spec Sheet Page 3
Warranty Information
JBL Professional Control 28-1L speakers come with a limited warranty. The specific terms and duration of the warranty may vary by region and retailer. Please retain your proof of purchase for warranty claims.
For detailed warranty information, including coverage, limitations, and the process for making a claim, please visit the official JBL Professional website or contact your authorized JBL dealer.
Customer Support
For technical assistance, product inquiries, or service requests, please contact JBL Professional customer support through their official channels:
- JBL Professional Website: pro.harman.com
- Contact Information: Refer to the 'Support' or 'Contact Us' section on the JBL Professional website for phone numbers, email addresses, and service center locations in your region.
When contacting support, please have your product model (Control 28-1L) and serial number ready.
