Alpine PDR-F50, PDR Series 4 Channel Class-D Car Amplifier - 600 Watts

Dual-Feedback Modulation Loop When playing music, a clean, distortion-free, low-power signal input to an amplifier should exit as an identical high-power output signal to drive your speakers. In reality, most amps dont even come close to this ideal, instead adding significant audible distortion especially in the high frequencies, earning typical Class-D amplifiers a deserved reputation for bad sound. The PDR-Powers Global Modulation with Adaptive Feedback Control loop circuitry intelligently assures the power output is as clean and distortion-free as possible. Their real-time error-correction analyzes the signal not only once, but twice by comparing input signal with the output throughout the entire amplification process. In doing so, PDR-Power amplifiers ensure that their output signal delivers a clean, clear and powerful sound that must be heard to be believed.¬† Small, Powerful Design The new PDR-Power series amplifiers have decreased in size compared to the X-Power, yet they pack in much more flexibility, durability with Alpine sound quality.¬† Standing Alone in the Clarity Class Ultra-Wide Frequency Bandwidth: This super-wide, industry leading frequency range offers listeners unparalleled sound quality and detail that bests even the most high-end audiophile equipment. Best Signal-to-Noise: In order to ensure that all of the industry-leading sound quality is heard at your ears, weve worked to create a platform that offers an unbelievably low noise floor, taking extra care to ensure a clean signal path, with no extraneous inferences. Low Distortion: PDR-Power amps offer extremely wide and linear frequency response that results in unparalleled musical detail. Extremely low distortion means pure musical performance without audible artifacts to destroy your sound experience. Additionally, these amps have extremely high stereo separation and smooth phase response, which means more dynamic realistic imaging and staging for your total musical enjoyment. On the Mono side, best-in-class low distortion and tight control will give you clean, accurate bass response. PDX Technology Inside (Cont.) Highest Damping Factor: With ultra-low output impedance, the new PDR-Power offers extremely controlled, tight bass for unprecedented sound quality. Damping Factor ratings are >1300 for Mono and >500 for full range models. Sharper -24dB/octave slope: Ensuring that your sub plays longer, accurate and cool the new PDR-Power has a -24dB octave slope in the built-in low pass filter. A sharper slope to the subwoofer allows only the desired low-end frequencies play through your subwoofer. Unequaled Reliability Excessive heat is the enemy of amplifiers and under extreme conditions will result in most amps shutting down completely. PDR-Power amps use a special Multi-Stage Power Management circuit that continuously monitors critical component temperatures throughout the amplifier and decreases power output if anything gets too hot. If you are playing music under heavy loads for long periods, the circuit automatically reduces power output slightly at first, and then further in a second stage if necessary. This two-stage approach provides seamless, interruption free listening experience for non-stop music playback. Rotatable Illuminated Alpine Badge PDR-Power amplifiers come with a rotatable illuminated badge that makes a very attractive presentation when mounted vertical or horizontally. Topside Controls and Adjustments Topside controls on top of the PDR-Power amplifiers make installation and tuning easier than its predecessors. Just unscrew two fasteners and youll have access to all the controls needed to tune the amplifier. Their small size and versatile controls allow the PDR-Power amplifiers to easily be added to either an aftermarket or factory system and can be setup to accommodate a variety of system configurations. Remote Sensing The PDR-Power amplifiers will automatically turn on when voltage is detected on their speaker-level inputs, which makes them great for easy factory system upgrades. Proven PowerCertified From Birth All PDR-Power amplifiers are individually tested and have certified power ratings. Each amp comes with their very own verification certificate documenting its actual power output exceeds the rating by a wide margin. General Features:  Alpine PDR Series 4-Channel Class D Car Amplifier RMS Power Rating @4 ohms: 85 watts x 4 channel RMS Power Rating @ 2 ohms: 125 watts x 4 channel RMS Power Rating @ Bridged, 4 ohms: 250 watts x 2 channel CEA-2006 Compliant Amplifier Dual-Feedback Modulation Loop Ultra Compact Chassis Soft start turn-on Rotatable Illuminated Alpine Badge LED Power (blue) and Protect (red) illumination Top-Side Control Panel w/ Removable Cover Voltage ON/OFF Sensing for OEM Upgrade 4/3 or 2 channel operation Input channel selecting Speaker-level (high-level) inputs via RCA with Remote Sensing* 3-way protection circuitry (thermal, overload, and speaker short protection) Heavy duty aluminum alloy heat-sink Input sensitivity: 200 mV - 4 V Frequency Response: 8 - 45,000 Hz +0/-3 dB Total Harmonic Distortion (THD): 0.02% (Ref: 10W into 4Ohm) Signal to Noise Ration: >106dB (Ref: 1W into 4Ohm) Damping Factor: >500 Selectable crossover: OFF / HP / LP Variable crossover point: 50 - 400 Hz, 24 dB/octave Selectable Bass Boost (Rear Ch Only): 0, +6, +12 dB boost at 50 Hz Fuse Rating: 30 A x 2 Weight: 5 lb 9 oz Dimensions: 9.0"Wx 6.5"Lx 2.0"H 1 Year Manufacturer's Warranty | Number of Channels 4 Class D Peak Power Rating (Watts) RMS Power Rating (Watts x Channels) - 4 Ohms 85 x 4  RMS Power Rating (Watts x Channels) - 2 Ohms 125 x 4 RMS Power Rating - Bridged 250 x 2 Minimum Impedance Unbridged (Ohms) 2 Minimum Impedance Bridged (Ohms) 4 THD at Rated RMS Power 1% Bulit-in Crossover - Low Pass Yes Built-in Crossover - High Pass Yes High Pass Crossover Frequency (Hz) N/A Low Pass Crossover Frequency (Hz) 50-400hz Signal-to-Noise Ratio 87dB Bass Boost 0, 6, 12dB Bass Remote Included No Fuse Rating 60A CEA-2006 Compliant Yes Maximum Power Wire Gauge Size 4 gauge Warranty 1 Year