Yorkville AP4K - 1800W 2-Channel at 4-Ohm Power Amplifier with XLR and 1/4-inch Inputs in Black Finish

The Yorkville AP4K is a powerhouse amplifier designed to meet the needs of the most demanding touring and installed sound systems. With its 2U, rack-mountable design, this amplifier delivers exceptional power and reliability, making it the flagship model of Yorkville Sound's amplifier line. Whether you're powering large concert rigs, complex installations, or a high-demand PA system, the AP4K offers the clean, transparent sound quality and raw power you need for optimum performance.

Delivering 1800 watts per channel at 2Ω or 4Ω, the AP4K is a true workhorse. It is capable of reaching up to 3600 watts in bridged operation at 4Ω or 8Ω, offering incredible headroom for professional audio setups. The amplifier is built with a Class H design, which combines the efficiency of Class D with the superior transient response and low distortion of analog designs, ensuring high-fidelity sound reproduction. The use of a toroidal transformer minimizes hum and interference, providing a clean, undistorted signal for flawless audio.

The rear panel features flexible input and output options, including balanced XLR and 1/4" inputs, and binding post and speakON outputs, making the AP4K compatible with a wide variety of audio equipment. The 3-tier Class H circuitry ensures energy-efficient operation, while transparent limiting and advanced protection mechanisms safeguard the amplifier and connected components. The AP4K also includes soft turn-on circuitry, providing a smooth, gentle startup to protect speakers from any sudden surges.

Built with all-steel construction, the AP4K is durable enough to withstand the rigors of professional use in both touring and permanent installations. With comprehensive protection features such as short circuit, DC, and thermal protection, along with a peak limiter that can be defeated if desired, the AP4K is designed to provide reliable, long-term performance. The amplifier's cooling is achieved through a front-to-rear fan system, which ensures optimal operating temperatures even during extended use, preventing thermal damage while maintaining optimal performance.

With its extensive range of features, including selectable 2Ω and 4Ω operation modes, the ability to bridge to 3600 watts, and a frequency response of 20 Hz - 20 kHz, the AP4K is the perfect amplifier for a variety of professional audio applications. From live concerts to corporate AV systems, the AP4K delivers power, clarity, and versatility for every performance.

Features

• 1800W per channel at 2Ω or 4Ω, 3600W bridged at 4Ω or 8Ω
• Class H design offering efficiency and low distortion
• Transparent limiting and advanced protection to ensure reliability
• Toroidal transformer reduces hum and interference
• Multiple inputs: balanced XLR, 1/4" TRS, and outputs: speakON and binding post
• Fan cooling with front-to-rear airflow for optimal heat dissipation
• Short circuit, DC, and thermal protection with peak limiter (defeatable)
• Frequency response: 20 Hz - 20 kHz, THD: <0.1% at 4Ω
• Slew rate: 50 V/?S bridged, damping factor: 600 at 8Ω
• Max SPL: 133 dB peak, 127 dB continuous
• Rack-mountable 2U design, weighs 41 lbs
• Dimensions: 16.5 x 19 x 3.5 inches

Specifications

General

• Amplifier Class: Class H
• Continuous Average Power
  • 8 Ohms: 1000 W x2 (4Ω), 600 W x2 (2Ω)
  • 4 Ohms: 1800 W x2 (4Ω), 1000 W x2 (2Ω)
  • 2 Ohms: 1800 W x2 (2Ω)
  • Bridged: 3600 W (8Ω, 4Ω)
• Burst Average Power
  • 8 Ohms: 1800 W x2 (4Ω), 1000 W x2 (2Ω)
  • 4 Ohms: 3500 W x2 (4Ω), 1800 W x2 (2Ω)
  • 2 Ohms: 2500 W x2 (2Ω)
  • Bridged: 7000 W (8Ω), 5000 W (4Ω)
• Frequency Response: 20 Hz - 20 kHz
• Hum and Noise: -100 dB Unweighted, -115 dB A-Weighted
• THD (1kHz, 4 Ohms): <0.1%
• THD (20Hz-20kHz, 4 Ohms): <0.1%
• Slew Rate: 25 V/μS Average, 50 V/μS Bridged
• Damping Factor (30 Hz - 400 Hz at 8 Ohms): 600
• Crosstalk (1kHz / 20Hz-20kHz): -75 / -60 dB
• Input Impedance (Bal / Unbal): 10 kΩ / 5 kΩ
• Input Sensitivity for Full Power Output: 1.0 V (2Ω), 1.4 V (4Ω)
• Max Voltage Gain: 36 dB
• CMRR at 60Hz (min/typ): 48 dB / 56 dB
• Stereo / Bridge (S/B): Yes
• Protection: DC, Load, Thermal
• Limiter: Peak (Defeatable)
• High Pass Filter: 18 dB per Octave at 50 Hz
• Cooling: Fan
• Cooling Path: Front to Rear
• Inputs - XLR: 2, 1/4" Jacks: 4
• Outputs - Speakon 4-pin: 2
• Outputs - Binding Post: 2
• Power Consumption (typ/max): 1130 W / 1800 W
• Rack Spaces: 2
• Transformer Type: Toroidal
• Exterior Finish: Black Paint
• Dimensions (DWH): 16.5 x 19 x 3.5 inches
• Weight: 41 lbs