FEUR FU-A4K professional Class D power amplifier - Overview

The FEUR FU-A4K is a audio product with frequency response 20Hz - 20kHz, input impedance 20k Ohms, power consumption 500W / 25A Peak. It is built for working audio professionals.Free shipping · Free local pickup in Miami · Financing at checkoutThe FEUR FU-A4K amplifier represents the perfect entry into our K Series of professional Class D amplification. With 4,000 watts RMS per channel into 4Ω (6,000W into 2Ω), this two-channel amplifier combines energy efficiency exceeding 90% with exceptional sound quality for mid-sized professional audio systems.Specifically designed for stage monitors, corporate PA systems, and small venues, the FU-A4K utilizes state-of-the-art PWM modulation technology with switching frequency exceeding 100kHz. Its switch-mode power supply architecture with active PFC guarantees stable operation on any global electrical network, while multiple protection systems (short circuit, DC offset, thermal) ensure maximum reliability.At a Glance Description Tour Grade 2 Channel Frequency Response 20Hz - 20kHz Signal to Noise 93dB Input Sensitivity 0.7V THD at 1 kHz < 0.5% Input Impedance 20k Ohms Input Connectors 3 pin XLR Output Connectors 2 Pin Speakon Where Is the FU-A4K Used?FEUR lists these as the professional applications for this model: Stage Monitors: Powering up to 2×15" wedges with clean headroom for vocal and instrument mixes. Corporate PA Systems: Ideal for events of 150-250 people in hotels, conference rooms and auditoriums. Houses of Worship & Community Centers: Reliable main or monitor amplification for church and community spaces. Small Theater Reinforcement: Driving main arrays or fills in intimate performance venues. Subwoofer Duty: Suitable for dual 15" or single 18" subs and compact 8" arrays (4-6 modules). What Comes in the Box? 1× K Series power amplifier (model per order) IEC power cable Rack-mount hardware User manual Specifications Description Tour Grade 2 Channel Frequency Response 20Hz - 20kHz Signal to Noise 93dB Input Sensitivity 0.7V THD at 1 kHz < 0.5% Input Impedance 20k Ohms Input Connectors 3 pin XLR Output Connectors 2 Pin Speakon Power Consumption 500W / 25A Peak Rating: 4 Ω Stereo 2000W / 63V Rating: 8 Ω Stereo 1700W / 75V Rating: 4 Ω Bridge 4000W / 100V Rating: 8 Ω Bridge 2500W / 123V Certifications and Industry Recognition NAMM Member Member of the National Association of Music Merchants, the global trade association for the music products industry. USA Verified Manufactured and quality checked under FEUR's USA verification standards. CE Marking Compliant with European Union safety, health and environmental protection directives. RoHS Compliant Free from restricted hazardous substances under the RoHS directive. Why FEUR?FEUR was founded in Germany by a team of engineers and sound specialists who set out to make professional audio equipment that performs at a high level and stays within reach of the people who actually use it every week. Where most of the industry aims either at high-end studio work or at the bottom of the market, FEUR builds for the working middle: independent artists, houses of worship, schools, mobile operators and installed systems that need gear to show up and work every week.Frequently Asked QuestionsIs this a genuine FEUR product? Yes. Victory is a veteran owned dealer in Miami and units ship new in original packaging.Does the FU-A4K come with a warranty? Yes. It carries the FEUR manufacturer warranty against defects in materials and workmanship. Keep your invoice and call us at 844-687-4208 if you ever need service.How does the K Series differ from the TRA Series? The K Series uses a switching power supply optimized for tour-grade portability and high instantaneous peak power delivery. The TRA Series uses a toroidal transformer, offering superior stability in permanent installations and regions with fluctuating mains voltage.Is the FU-A10K suitable for multi-zone or bi-amp applications? Yes. As a 4-channel amplifier, the FU-A10K is well-suited for distributed audio systems, bi-amping active speaker arrays, or driving multiple speaker zones from a single rack unit.What speaker systems benefit most from the FU-A14K? The FU-A14K is ideal for driving large passive subwoofer stacks and high-power main PA arrays at major concerts and festival productions.Why Victory Musical Instruments?Victory Musical Instruments is a veteran owned pro audio and musical instrument dealer based in Miami, Florida. We are working musicians and certified audio engineers, not a fulfillment warehouse, so when you call us about a speaker or an amplifier you are talking to someone who has actually run one at a gig. Every unit ships new in original manufacturer packaging. Call us at 844-687-4208 and we will help you spec the right thing the first time.