Nx Audio Rx 4000 Circuit Diagram [top] Jun 2026

A professional amplifier must protect itself and the connected loudspeakers from catastrophic failures. The RX 4000 features several integrated protection sub-circuits:

Inspect the bias circuit and the Vbe multiplier transistor. An open-circuit bias resistor can cause severe crossover distortion.

If you are planning to run a technical diagnostic or looking to replace specific components on an RX 4000 board, let me know. I can help you narrow down the issue if you tell me:

When a high-amplitude transient or heavy bass hit occurs, high-speed rail-switching circuitry (often utilizing MOSFETs or high-speed diodes) instantly connects the output stage to the higher voltage rails (e.g., ±120V DC). nx audio rx 4000 circuit diagram

Output transistor bank (2SC/2SA), driver transistors, output relay.

Circuit Functionality

However, like all high-performance electronics, the RX 4000 is susceptible to failure—especially when pushed to its limits. When the smoke escapes or the protection light flashes, the most vital tool for any technician is the (often referred to as the schematic or service manual). A professional amplifier must protect itself and the

The VAS elevates the low-voltage input signal to the high-voltage swing required to drive the output transistors. This stage determines the amplifier's slew rate and overall open-loop gain. 3. Class H Step-Up (Rail Switching) Circuit

They connect the high-voltage rail only when the signal exceeds the threshold of the lower rail.

: Always discharge the primary filter bank using a power resistor before touching components. If you are planning to run a technical

Do you need assistance identifying for the output stage?

The is more than just a wiring picture; it is a diagnostic engine. Whether you are repairing blown MOSFETs due to voltage spikes or recalibrating the idle current after a component upgrade, the schematic guides every solder joint and measurement.