Nx Audio Rx 4000 Circuit Diagram __link__ Jun 2026
The conditioned line-level signal enters the Voltage Amplification Stage (VAS), which boosts the signal's voltage swing close to the power supply rails.
Traditional, stable Class AB circuit design, ensuring low distortion and high fidelity.
Measure the DC voltage before the output relay. If you find a high DC voltage (positive or negative rail voltage) on the output line, one or more output transistors have likely shorted.
When powering up the circuit after a repair, always use a series current-limiting AC light bulb tester or a variac to prevent instantaneous destruction of new components if a hidden short remains.
Features four individual cooling fans and advanced ventilation to maintain optimal operating temperatures during extended use. Analyzing the Circuit Diagram nx audio rx 4000 circuit diagram
High-power ceramic resistors can crack open when a transistor fails, cutting off power to parts of the output stage.
If the amplifier turns on but has no sound, trace the signal from input XLR to the output terminals using a signal generator and oscilloscope. 4. Important Specifications & Considerations Damping Factor: >400. Dimensions: 2U Rack Space.
Active high-pass filters are implemented to remove sub-audible frequencies (typically below 30Hz or 50Hz) that would otherwise waste power and damage subwoofers. 2. The Power Supply Unit (PSU) Circuit
Understanding the circuit's architecture is the most effective tool for diagnosing problems. Here are common fault scenarios and how to approach them based on the functional blocks described: If you find a high DC voltage (positive
Design & Layout
The RX 4000 follows a traditional, high-stability , which is prioritized for its "Zero Noise" performance and reliability in demanding environments with unstable power grids.
: Limits inrush current during power-on to protect internal components.
If you need help finding specific or equivalent transistor part numbers? Share public link 1. Power Supply Unit (PSU) Stage
If the amplifier sounds clean at low volumes but severely distorts or clips prematurely at high volumes, the Class H switching MOSFETs or comparator circuitry may be faulty. Check if the high-voltage rails are successfully engaging when a large signal is injected into the input. Technical Specifications Snapshot Feature / Parameter Standard RX Series Operational Metrics Topology Class H (Multi-rail dynamic switching) Output Devices High-power complementary BJTs (Toshiba / ON Semi) Cooling System Dual variable-speed DC fans, front-to-back airflow Input Connections Balanced XLR & 1/4" TRS Jacks Output Connections Professional Speakon & Binding Post terminals Core Protections
: The unit features a heavy-duty toroidal transformer-based power supply. This provides high headroom and stable performance even when driving difficult 2-ohm loads.
The diagram is a multi-page PDF (usually 4–5 sheets) covering the power supply, input stage, main amplifier section (both channels), and protection circuit. Component labels (R12, C23, Q7, etc.) match the actual silkscreen on the board—this was a relief.
The circuit includes a "Specialized System Protection" module designed to safeguard both the amplifier and connected speakers :
This article breaks down the core sections of the NX Audio RX 4000 circuit design, explaining how its internal components manage power, protect speakers, and amplify audio signals. 1. Power Supply Unit (PSU) Stage