Beta 3 U15a Service Manual |top| ❲SIMPLE❳

Allow the amplifier to idle for 5 to 10 minutes until the heatsink reaches a stable temperature.

A: Beta 3 produces bilingual manuals. If yours is only Chinese, contact the distributor. The official service manual for export markets is always English/Chinese side-by-side. Key terms to look for: 电源板 = Power Board, 功放管 = Output Transistor.

: 300W RMS allocated to the Low Frequency (LF) system; 100W RMS allocated to the High Frequency (HF) system. Beta 3 U15a Service Manual

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: Glows green to verify that input signals exceed the minimum input detection threshold. Allow the amplifier to idle for 5 to

The Beta 3 U15a is a high-output, active two-way speaker widely used in professional audio environments. It features a 15-inch low-frequency driver and a high-frequency compression driver, powered by a built-in Class AB/Class D bi-amplified module.

: Verify ±15V DC dual-rail supplies reach the internal operational amplifier ICs. The official service manual for export markets is

The or serial number prefix of your U15a unit.

| 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) |

Before opening the cabinet, it is critical to understand the operating parameters of the Beta 3 U15a. Operating outside these specifications during testing can permanently damage the transducers or the built-in amplifier module. Active 15" 2-Way Full Range Speaker Frequency Response (-3dB): 40Hz - 18kHz Maximum SPL (1m): 120dB / 126dB (Peak)