Pure Resonance Audio LA21000 Low-Impedance 1000W Rack Mount Power Amplifier

$ 935.99
$ 779.99


2-Channel Rack Mounted Stereo
Power Amplifier with 1000 Watts
per Channel at 4 Ohms

The Pure Resonance Audio LA21000 is a powerful and efficient 2-channel rack mount amplifier that operates at low impedance. This compact and lightweight stereo power amplifier is housed in a rugged 1U 19" rack-mounted chassis. Combining a robust 1000 watts of Class D power with a switched-mode power supply allows for a lighter-weight unit, enhanced efficiency, and ensures stable and continuous operation. With XLR inputs, LINK, and SpeakON NL4 outputs, the LA21000 accommodates 4 or 8 ohms in mono or stereo mode, as well as 8 or 16 ohms bridged, catering to various live and installed applications. The LA21000 is an economical and reliable professional power amplifier that provides exceptional performance, durability, and sound quality.


Class D low-impedance digital amplification with switched mode power supply technology for 95% ultra-high efficiency with low distortion.


Designed with standard XLR inputs and XLR LINK outputs, as well as locking SpeakON NL4 outputs.


2 Channels support mono, stereo, or bridge modes, providing 2x700W at 8 ohms and 2x1000W at 4 ohms in stereo mode or 1400W at 16 ohms and 2000W at 8 ohms bridged.

Works long hours

Smart forced cooling fans with low fan noise and effective high heat dissipation ensure reliable operation even with use over extended periods.


Compact, lightweight, yet durable space-saving construction in a 1U 19-inch industrial-grade chassis.


Soft starter and smart peak clipper, DC, overload, short circuit, overheat protection, and power, protection, peak, and signal indicators ensure the unit operates safely.

Refined & Compact Power Amplifier

The Pure Resonance Audio LA21000 low-impedance amplifier, with a robust 1U 19-inch cabinet design, is exceptionally compact, lightweight, and durable. The space-saving construction allows for easy integration into a diverse array of rack-mounted configurations without compromising on power or performance. The LA21000 offers twice the power within the same size and weight as our previous amplifier models, delivering maximum output power while simultaneously protecting the equipment. This stereo power amplifier provides dynamic, clear sound reproduction and consistent operation.

High-Efficiency Class D Amplification

At the heart of this 2-channel rack mount amplifier lies cutting-edge Class D low-impedance amplification with ultra-efficient technology, delivering a powerful audio experience. The LA21000 has three mode options: mono, stereo, or bridge, with an impressive power output ranging from 700W(8Ω)/1000W(4Ω) per channel in stereo mode to 1400W(16Ω)/2000W(8Ω) bridged. This audio power amplifier boasts 95% ultra-high efficiency and low distortion to maximize power output while minimizing energy consumption. Standard XLR inputs and SpeakON NL4 outputs, as well as XLR LINK outputs to link to additional amplifiers for added power, provide flexibility for a wide variety of live and installed environments.

Intelligent Cooling & Advanced Protection

The LA21000 comes equipped with intelligent features that go beyond amplification, providing powerful functionality, reliability, and durability for optimal performance. The switched-mode power supply reduces weight, enhances efficiency, and effectively suppresses distortion, ensuring stable and reliable operation. Incorporating soft starter technology prevents current spikes during startup or interference with other electrical equipment. Additionally, forced cooling technology with low fan noise and high heat dissipation efficiency keeps the rack mount power amplifier running smoothly even during prolonged use. The LA21000 also includes advanced protection circuitry, such as over-voltage, under-voltage, over-current, output short circuit, overheat, and DC protection, providing a comprehensive safety net for your audio system.


Output Power:
Stereo 8Ω: 2x700W, Stereo 4Ω: 2x1000W
Bridge 16Ω: 1400W, Bridge 8Ω: 2000W

Input Sensitivity: 2.2 dBU(1V)/8.2 dBU(2V)

Input Impedance: 10kΩ unbalanced, 20kΩ balanced

Voltage Gain (@1kHz): 37.5 dB

Frequency Response (@1W): 20Hz - 20kHz (±1 dB) @ 8 Ohms

Distortion (THD @1/8 Power): ≤0.01%

Signal-to-Noise (S/N) Ratio: ≥102 dB

Damping Coefficient (@1kHz): ≥200 @ 8 Ohms

Separation (@1kHz): ≥80 dB

Protection Method: Over-voltage protection, under-voltage protection, over-current protection, DC protection, short circuit protection

Cooling Method: Fan cooling

Indicator: Power, Fault, Clip, Signal

Power Supply: ~110-120V 60Hz

Power Consumption: 1800W

Dimensions (H x W x D): 1.73" (44 mm) x 19.06" (484 mm) x 10.04" (255 mm)

Weight: 11.24 lbs (5.1 kg)


What comes in the box?
(1) LA21000 1000W 2-Channel Power Amplifier
(2) NL4FX Adapters