Alpine R-A90S

Alpine R-A90S R-Series 6-Channel Staggered Power Amplifier The Alpine R-A90S is a versatile 6-channel amplifier from Alpine's R-Series, designed to deliver high-resolution audio with a unique staggered power configuration. This amplifier provides flexibility for various system setups, including 3-way active systems and powerful subwoofer configurations, ensuring precise and dynamic sound reproduction. Key Features Feature Details Power Output 75W x 4 + 150W x 2 @ 4Ω (14.4V, ≤1% THD+N) 100W x 4 + 250W x 2 @ 2Ω (14.4V, ≤1% THD+N) Bridged: 200W x 2 + 500W x 1 @ 4Ω (14.4V, ≤1% THD+N) Amplifier Class Class D with Dual "Sierra" Post-Filter Feedback Loops High-Resolution Audio Compliant up to 45kHz frequency response Crossover Controls Channels 1/2: High-Pass Filter (50–400Hz or 400–6,000Hz, 12dB/octave) Channels 3/4: High-Pass or Band-Pass Filter (50–400Hz and 400–6,000Hz, 12dB/octave) Channels 5/6: Low-Pass Filter (50–400Hz, 12dB/octave) Input Options Speaker-level and preamp inputs with GTO™ (Great Turn-On) signal-sensing Remote Control Compatible with Alpine RUX-KNOB.2 for subwoofer level control (sold separately) Design Compact chassis with one-sided terminal layout for easy installation What’s in the Box Alpine R-A90S 6-Channel Amplifier Three 30-amp ATO fuses (installed) 4 Mounting feet Four 3/4" Screws Eight M2.5x5.5mm Machine screws 2mm Allen wrench 3mm Allen wrench Owner's Manual Alpine Verification Certificate Warranty Information Power Supply Note Online Product Registration Information Technical Specifications Spec Value RMS Power Output 75W x 4 + 150W x 2 @ 4Ω 100W x 4 + 250W x 2 @ 2Ω Bridged: 200W x 2 + 500W x 1 @ 4Ω Frequency Response 10Hz – 45kHz (±3dB) Signal-to-Noise Ratio >85dB (ref. 1W into 4Ω) Total Harmonic Distortion ≤0.03% (ref. 10W into 4Ω) Damping Factor >500 Input Sensitivity 0.2V – 4V Minimum Impedance 2Ω (unbridged), 4Ω (bridged) Fuse Rating 30A x 3 (external fuses required) Dimensions (W×H×D) 12.75" × 2" × 10.75" Weight Approximately 7 lbs Warranty 1 Year