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The NX Audio Proton RX-4000 is a two-channel Class AB power amplifier delivering 1550 watts per channel at 2 ohms, with a built-in crossover and full protection.
1550 W per channel: at 2 ohms stereo; 1150 W at 4 ohms, 700 W at 8 ohms.
Built-in crossover: high-pass and low-pass for subwoofer or mid-high use.
Bridgeable: 2400 W at 8 ohms and 3400 W at 4 ohms bridged.
Damping over 400: tight control of loudspeaker drivers.
Full connectivity: XLR and TRS inputs; Speakon, jack and binding-post outputs.
The NX Audio Proton RX-4000 is a two-channel professional power amplifier built for PA systems, DJ rigs, live venues and installations that need serious, dependable output. In a two-ohm stereo application it delivers 1550 watts RMS per channel, with 1150 watts per channel at four ohms and 700 watts per channel at eight ohms, and it bridges to 2400 watts per channel at eight ohms and 3400 watts per channel at four ohms, so it can drive demanding full-range loudspeakers or subwoofers with headroom to spare. A Class AB design with a damping factor over 400, built-in high-pass and low-pass crossover filters, comprehensive protection and temperature-controlled cooling make it a workhorse amplifier for systems that run long and loud.
NX Audio’s own RX4000 page on nxaudio.com confirms the RX series power figures and crossover design used in this listing.
Why Choose NX Audio PROTON RX-4000?
The RX-4000 is chosen because it combines high output with the flexibility that installers and DJs actually need. Its built-in crossover lets one amplifier serve as a subwoofer amplifier or a mid-high amplifier, removing the need for an external crossover in many systems, while the full-range mode keeps it equally useful for straightforward full-range speaker setups. Stability at two ohms matters in real venues, where speaker loads and long cable runs rarely match textbook conditions, and the RX series is designed specifically to stay reliable under difficult loads and abnormal power conditions. Flexible connectivity, with XLR and 6.35 mm TRS inputs and Speakon, 6.35 mm and four-way binding-post outputs per channel, means it connects to almost any professional loudspeaker without adapters. Add protection against short circuits, overload, DC faults and overheating, plus bridging for larger single loads, and the RX-4000 covers everything from a club main system to a subwoofer installation.
Key Features
1550 watts per channel at 2 ohms: 1150 watts at 4 ohms and 700 watts at 8 ohms in stereo, with high bridged output.
Class AB design: proven amplifier topology with a damping factor over 400 for tight speaker control.
Built-in crossover: high-pass and low-pass filters configure the amplifier for subwoofer, mid-high or full-range use.
Flexible connections: XLR and 6.35 mm TRS inputs; Speakon, 6.35 mm and binding-post outputs per channel.
Comprehensive protection: short-circuit, overload, DC and thermal protection with temperature-controlled fans.
Bridgeable operation: bridge mode for driving larger single loads from both channels combined.
Best Suited For
The RX-4000 suits DJs, live sound engineers, event companies, clubs, auditoriums, houses of worship and installers building PA systems around full-range loudspeakers or subwoofers. It is ideal where two channels of high power are needed from a single rack unit, and where the same amplifier may be reassigned between subwoofer and full-range duties as a system changes. It is a mains-powered rack amplifier weighing around 28 kg, so it belongs in a rack or a fixed install rather than a portable grab-and-go kit, and speaker impedance and power handling should always be checked against the published output figures before connection. Users needing four channels in one unit should consider a four-channel model instead.
Setup and Connection Guide
Mount the RX-4000 in a ventilated rack with clear airflow for its temperature-controlled fans, and connect it to a 220 V mains supply. Connect mixer or processor outputs to the channel inputs using XLR or 6.35 mm TRS cables, and connect loudspeakers to the Speakon, 6.35 mm or binding-post outputs, matching each channel’s speaker impedance to the published ratings. Set the built-in crossover to high-pass, low-pass or bypass depending on whether the channel drives a subwoofer, a mid-high cabinet or a full-range system, and set input sensitivity to suit the driving mixer. Start with channel levels down, power on the mixer first and the amplifier last, then raise levels gradually while watching the front-panel indicators. For bridged operation, follow the amplifier’s bridge wiring and impedance guidance exactly, and never connect a bridged load below the rated impedance. Power the amplifier off first when shutting down, then the mixer.
Frequently Asked Questions
How much power does the NX Audio Proton RX-4000 deliver?
In stereo it delivers 1550 watts RMS per channel at 2 ohms, 1150 watts per channel at 4 ohms and 700 watts per channel at 8 ohms. In bridge mode it delivers 2400 watts per channel at 8 ohms and 3400 watts per channel at 4 ohms.
Can the NX Audio Proton RX-4000 power subwoofers?
Yes. Its built-in high-pass and low-pass crossover filters let it be configured as a subwoofer amplifier or a mid-high amplifier, as well as a full-range amplifier, without an external crossover.
What speaker connections does the NX Audio Proton RX-4000 offer?
Each channel offers Speakon output jacks, 6.35 mm output jacks and four-way binding posts, with XLR and 6.35 mm TRS inputs, covering the standard professional loudspeaker connection types.
Technical Specifications
Brand
NX Audio (Proton series)
Model
Proton RX-4000
Type
2-channel power amplifier, Class AB
Output, stereo
1550 W + 1550 W RMS at 2 ohms; 1150 W per channel at 4 ohms; 700 W per channel at 8 ohms
Output, bridged
2400 W per channel at 8 ohms; 3400 W per channel at 4 ohms
Damping factor
Over 400
Crossover
Built-in high-pass and low-pass filters, plus bypass, for subwoofer, mid-high or full-range use
Inputs
XLR and 6.35 mm TRS jacks per channel
Outputs
Speakon, 6.35 mm and 4-way binding post per channel
Protection
Short-circuit, overload, DC and thermal protection; temperature-controlled fans; bridging ability
Frequency response
20 Hz – 20 kHz
Power supply
220 V
Dimensions
482 mm x 88 mm x 453 mm
Weight
Approximately 28 kg
Explore Related Products: Professional Audio at Pro Audio Video — a related option from the Pro Audio Video range that pairs with the system described above.
Additional Information
Specifications
Brand
NX Audio
Model / SKU
NX-AUDIO-PROTON-RX-4000
Category
Power Amplifiers
Condition
Brand new, sealed box
Warranty
Official manufacturer warranty (India)
GST invoice
Yes, input credit available
Warranty Information
Buy with peace of mind. The NX Audio PROTON RX-4000 2-Channel Power Amplifier comes with the official manufacturer’s warranty for India, valid from the date on your GST invoice. Pro Audio Video is a specialist audio video store, and every product we sell is brand new, sealed and sourced through authorised channels, so your warranty is honoured at brand service centres across India.
Official Indian warranty, as specified by the manufacturer
GST invoice with every order, needed for warranty claims
We help you raise and follow up warranty claims with the brand
Delivery and Shipping
Same-day dispatch on most in-stock orders
Delivery anywhere in India; delivery time depends on your location
Shipped securely in the original manufacturer box
Cash on delivery available on orders up to ₹45,000
Tracking details by SMS and email as soon as your order ships
Returns and Refunds
Not right for you? Return unused products in their original packaging within 7 days of delivery. If a product arrives damaged or defective, tell us within 48 hours with photos and we will replace it or refund you in full.
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