Ashly KLR-4000 850 W High-Efficiency 2-Channel Power Amplifier(Ashly Klr 4000 850 W High Efficiency 2 Channel Power Amplifier)

The Ashly KLR-4000 850 W High-Efficiency 2-Channel Power Amplifier is a high-performance, two-channel power amplifier designed to deliver exceptional audio quality and reliability. Built to handle demanding audio applications, this amplifier is a powerful tool for live sound reinforcement, clubs, houses of worship, corporate events, and installation projects. Its core strength lies in its ability to produce substantial power: a minimum of 2,000 Watts per channel into 2 Ohm loads, 1,400 Watts RMS per channel into 4 Ohm loads, or 850 Watts RMS per channel into 8 Ohm loads when both channels are operating. This raw power is complemented by a clean and accurate sound signature, thanks to a signal-to-noise ratio exceeding 109dB and a THD of less than 0.05% into 4 Ohms across a 20Hz-20kHz bandwidth at 10dB below rated power.  

Versatility is a hallmark of the KLR-4000. Rear panel switches allow for both parallel mono and bridging modes, offering flexibility to match various system configurations. When bridged, the amplifier can deliver a potent 4,000 Watts into a 4 Ohm load. To further refine the audio output, the amplifier includes a channel attenuator for each input, input sensitivity select switches, a high-pass filter switch, and a limiter enable switch. These features empower users to tailor the sound to their specific needs.

Robust protection is essential for any high-power amplifier, and the KLR-4000 delivers. Equipped with safeguards against output overcurrent, DC output, chassis temperature, and power surges, it ensures reliable performance and protects connected equipment. The amplifier’s cooling system employs efficient forced-air cooling with removable dust filters, maintaining optimal operating temperatures and extending component life. Additionally, the KLR-4000 is built to withstand the rigors of professional use, featuring a sturdy 2RU rack-mountable chassis.

Connectivity options are comprehensive, catering to a wide range of audio sources and systems. Balanced inputs are provided via XLR, ¼ inch TRS, and 3-pin Euroblock connectors, while outputs are handled by four-pin SpeakON connectors. Clear LED indicators offer visual feedback on power level, clipping, and protection status, aiding in system monitoring. The amplifier’s frequency response extends from 20Hz to 20kHz (1W @ 8 Ohms), ensuring accurate reproduction of the full audio spectrum.

With its combination of power, features, and build quality, the Ashly KLR-4000 is a compelling choice for audio professionals seeking a reliable and high-performance amplifier.

Key Features

• Enhanced for optimal sustained power delivery
• 2 rack unit (RU) design
• Stable operation down to 2 Ohms
• Capable of 70V operation with KLR-3200 model
• Equipped with balanced inputs using 3-pin Euroblock
• Features Combo XLR/TRS input connectors
• Utilizes Neutrik® speakON® output connectors
• Includes 30 Hz, 6 Hz, and Off High Pass filter options
• Powered by switch-mode power supply with advanced protection features
• Includes On/Off limiter switch for added control
• Efficient forced-air cooling system with front-in, rear-out airflow
• Easy-to-maintain removable dust filters
• Convenient front-mounted attenuators for easy adjustments
• Removable amp handles for permanent installations
• Optional locking front panel volume knobs available
• Meets safety and compliance standards: cCSAus, CE, FCC, RoHS
• Output topology varies: KLR-2000 is Class-AB; KLR-3200, 4000, and 5000 are 2-step Class-H design.

Technical Specifications

KLR Models 2000 3200 4000 5000
Max Output Power: Per Channel, 20Hz–20kHz, 1%THD, Both Channels Driven
2 Ohms 1,000W 1,600W 2,000W 2,500W
4 Ohms 600W 1,100W 1,400W 1,700W
8 Ohms 350W 650W 850W 1,000W
Bridge Mode, 20Hz–20kHz, 1%THD
4 Ohms 2,000W 3,200W 4,000W 5,000W
Constant Voltage Options: Per Channel, 20Hz–20kHz, 1% THD
70V — 800W* — —
Line Current Draw: 120VAC 60Hz, All Channels Driven @ 4 Ohms
Idle 0.99A 0.92A 1.05A 1.14A
1/8th Power 9.7A 11.4A 14.0A 17.5A
(Pink Noise)

1/3 Power 14.9A 16.6A 19.8A 24.7A
(Sine Wave)

Thermal Dissipation: BTU/hr, All Channels Driven
Idle 164 136 171 215
1/8th Power 1876 2063 2489 3111
(Pink Noise)

1/3 Power 2880 3001 3516 4395
(Sine Wave)

Additional Specs
Signal-to-Noise >108dB >109dB >109dB >110dB
(20Hz–20kHz, unweighted)

Input Gain Switch 1V 1V 1V 1.4V
20dB 26dB 26dB 26dB
26dB 32dB 32dB 32dB

Output Circuitry Class AB 2-Step 2-Step 2-Step
Class H Class H Class H