If you are troubleshooting, I highly recommend downloading a digital copy to have on a tablet while you work. It saves hours compared to trial-and-error diagnostics.
: Features a 15-inch low-frequency woofer (50mm voice coil) and a 1.7-inch high-frequency compression driver.
Many Beta 3 modules include a fast-blow fuse or a PTC thermistor protection element dedicated to the HF output line. Beta 3 U15a Service Manual
| Category | Specification | | :--- | :--- | | | Two-way, full-range, bi-amplified active speaker | | LF Driver | 15" high-power transducer with a 2" (50mm / 75mm) voice coil | | HF Driver | 1.7" (44mm) diaphragm compression driver | | Frequency Response | 40Hz - 18kHz (-3dB) | | Maximum SPL | 120dB (Peak) | | Dispersion (H x V) | 50°-100° x 55° (Rotatable Horn) | | Total Power (RMS) | 400W (300W LF, 100W HF) | | Amplifier Type | Class H | | Input Impedance | Balanced: 20kΩ, Unbalanced: 10kΩ | | Input Connectors | 2 x XLR (Combo, Mic/Line switchable) | | Output Connector | 1 x XLR (Thru) | | Controls | Master Volume, Bass, Treble | | Enclosure Material | Polypropylene Injection Molding | | Mounting | 8 x M8 flying points, SMART pole mount system | | Dimensions (W x D x H) | 485 x 460 x 700 mm (19.1" x 18.1" x 27.6") | | Net Weight | 30.5 kg (67.2 lbs) | | Voltage Range | AC 220V-240V~, 50/60Hz (or AC 110V-120V~, 50/60Hz) |
: After changing output transistors, run the module through a variac transformer. Slowly increment voltages while monitoring the idle current draw. Static consumption should sit around 19W to 22W . If you are troubleshooting, I highly recommend downloading
To ensure longevity of the equipment and safety of the operator, always adhere to these precautions:
The is a powerful and versatile 15-inch, two-way, full-range active (powered) loudspeaker . It is designed for a wide range of professional portable and installed sound reinforcement applications. Its key selling points are its high output, built-in amplification, and rugged, portable design. Many Beta 3 modules include a fast-blow fuse
Utilizes heavy aluminum heatsinks coupled with thermal paste to dissipate heat through the backplate. 3. Common Troubleshooting & Repair Procedures
Whether you are an audio technician, an independent service engineer, or a live sound venue owner, maintaining the reliability of your audio gear is critical. This comprehensive guide serves as an unofficial service manual, offering an in-depth breakdown of technical specifications, amplifier architecture, systematic troubleshooting procedures, component replacements, and essential preventative maintenance for the Beta 3 U15a. 1. Technical & Acoustical Specifications