| TP# | Signal | Expected Value | Location | |-----|--------|----------------|----------| | TP1 | +15V rail | +15V ±0.5V DC | Near PSU output | | TP2 | -15V rail | -15V ±0.5V DC | Near PSU output | | TP3 | +55V rail | +55V ±2V DC (no signal) | LF amp supply | | TP4 | Crossover output (LF) | 1.8 kHz LPF, 2Vpp sine (1kHz in) | After crossover | | TP5 | Crossover output (HF) | 1.8 kHz HPF, 2Vpp sine (1kHz in) | After crossover | | TP6 | LF amp output (pre-filter) | 400 kHz square wave (idle), modulated PWM | MOSFET gates |
: For models featuring integrated media playback, the U15a-MP3 Manual provides specific instructions on USB interface operations and MP3 format requirements. Key Performance Characteristics Beta 3 U15a Service Manual
: A standout technical feature is the rotatable 50°–100° x 55° horn, which allows for controlled coverage patterns in both vertical and horizontal layouts. | TP# | Signal | Expected Value |
: 400W total RMS (300W LF + 100W HF) using a Class H amplifier module. Frequency Response : 40Hz – 18kHz (-3dB). Max SPL : 120dB Peak. Input Impedance : Balanced 20kΩ, Unbalanced 10kΩ. Frequency Response : 40Hz – 18kHz (-3dB)
New project in the shop? 🛠️ Make sure you’re prepared before you turn the first bolt on that Beta 3 U15a.