VTX B28 - Speaker JBL - Free user manual and instructions
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| Product Type | Passive Subwoofer |
| Model | VTX B28 |
| Brand | JBL |
| Speaker Configuration | Dual 18-inch |
| Frequency Response | 28 Hz - 150 Hz |
| Power Handling (Continuous) | 2400 W |
| Power Handling (Peak) | 4800 W |
| Impedance | 4 Ohm |
| Sensitivity | 99 dB (1W/1m) |
| Maximum SPL | 138 dB peak |
| Connectors | 2x Neutrik SpeakON NL4 |
| Enclosure Material | Birch Plywood |
| Finish | Black DuraFlex |
| Dimensions (H x W x D) | 56.4 cm x 107.0 cm x 75.2 cm |
| Weight | 86.2 kg |
| Grille | 16-gauge powder-coated steel |
| Rigging | Integral suspension points |
| Application | Professional sound reinforcement, touring |
| Cleaning | Wipe with a dry cloth; do not use solvents |
| Safety | Use proper rigging; consult professional installation |
| Spare Parts | Contact JBL authorized service centers |
| Reparability | Field-replaceable drivers and crossover |
Frequently Asked Questions - VTX B28 JBL
What type of amplifier is recommended for the VTX B28?
Use a high-power professional amplifier capable of delivering 2400 W continuous at 4 ohms per subwoofer. JBL recommends the Crown I-Tech 5000HD or similar.
How do I connect the VTX B28 to an amplifier?
Use Neutrik SpeakON NL4 cables. Pins +1/-1 are for the subwoofer input; pins +2/-2 can be used for pass-through to another enclosure.
Can the VTX B28 be used outdoors?
Yes, but protect from direct rain. The cabinet is constructed with weather-resistant DuraFlex finish, but the drivers are not waterproof.
What is the maximum SPL of the VTX B28?
The maximum peak SPL is 138 dB at 1 meter.
How do I stack multiple VTX B28 subwoofers?
Use the integrated rigging system. Stack them securely, ensuring the cabinet feet align with the top of the lower cabinet. Do not exceed 2 units per stack without structural support.
What is the optimal crossover frequency for the VTX B28?
Set the crossover between 80 Hz and 100 Hz when used with JBL VTX full-range loudspeakers.
How do I clean the grille?
Remove the grille and wash with mild soap and water. Rinse and dry thoroughly before reattaching.
What is the warranty period?
JBL provides a 5-year limited warranty for the VTX B28 from the date of purchase, covering defects in materials and workmanship.
Can I replace the drivers myself?
Yes, the drivers are field-replaceable. Remove the grille and unscrew the driver. Use only JBL original parts.
What is the polarity of the SpeakON connector?
Pin +1 is positive, pin -1 is negative. Ensure all connected enclosures have consistent polarity.
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USER MANUAL VTX B28 JBL
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Product information
Brand : JBL
Model : VTX B28
Category : Speaker