Nx Audio Rx 4000 Circuit Diagram Online

Here is the path the audio signal takes through the circuit board:

If an output transistor fails short-circuit, dangerous high-voltage DC will flow to the speakers. A sensing circuit monitors the output rail; if DC is detected, it triggers an output relay or a crowbar circuit to instantly disconnect the load. nx audio rx 4000 circuit diagram

[ Input Stage / Limiter ] ---> [ Voltage Amplifier Stage (VAS) ] ---> [ Class H Rail Switch ] | | v v [ Driver / Output Stage ] <-----------------+ | v [ Protection & Speaker Relays ] 1. Input and Pre-Amplifier Stage Here is the path the audio signal takes

: Limits inrush current during power-on to protect internal components. The input section accepts balanced signals via XLR

The input section accepts balanced signals via XLR or 1/4" TRS jacks.

A mechanical switch on the back panel alters the circuit layout for Stereo , Parallel , or Bridged Mono operations. In bridged mode, the circuit inverts the phase of Channel B relative to Channel A. 4. Voltage Amplification Stage (VAS) and Driver Circuit

If you have the physical PCB: