About the Alpine KTA-450 Power Pack Bump up the power If adding more power makes music sound better, Alpine's KTA-450 power pack will make a significant improvement in your system. This compact 4-channel amplifier puts out 50 watts RMS per channel from a tiny chassis that'll fit almost anywhere in your vehicle. KTA-450 uses Alpine's Dynamic Peak Power (DPP) technology to deliver a quick energy boost when needed, virtually doubling the amplifier's output power on musical peaks. PowerStack Installation Here's a very cool idea from Alpine — the package includes a PowerStack bracket for mounting the amp in your dash behind Alpine's shallow chassis iLX-W650 or iLX-407 digital multimedia receiver. The combined depth of receiver and amp is still less than 5", so it'll fit in a wide variety of vehicles. The receiver and amp together make a feature-filled and powerful sound system that you'll enjoy for many miles. Installation Notes: This power pack will not work in systems with a factory amplifier. Wiring and fuse are not included — 12-gauge power and ground wires and a 20A inline fuse at the battery are required. Product highlights: Featured in our article: Best 4-channel car amplifiers for 2025 4-channel car amplifier 50 watts RMS x 4 at 4 ohms (45 watts RMS x 4 at 2 ohms) 100 watts RMS x 2 bridged at 4 ohms CTA-2006 compliant Dynamic Peak Power (DPP) technology adds a burst of power when needed selectable high-pass filters (60, 80, 120 Hz at 12 dB/octave) on front and rear channels preamp and speaker-level inputs selectable 2- or 4-channel input PowerStack bracket included for mounting amp behind Alpine iLX-W650 (#500ILXW650) or iLX-407 (#500ILX407) digital multimedia receiver wiring, hardware, and fuse not included with amplifier 12-gauge power and ground leads and a 20A fuse recommended dimensions: 7"W x 1-3/8"H x 3-9/16"D warranty: 1 year MFR # KTA-450 Item # 500KTA450 California customers: Please click here for your Proposition 65 WARNING. What's in the box: If you need assistance accessing this owner's manual, please give us a call. 4-Channel amplifier 12" Input/Output/Power harness 1 Head unit (iLX-W650) mounting bracket 2 Universal mounting brackets Four M5x6mm Allen head machine screws (3mm) Two M2.6x8mm Machine screws Four 3/8" Screws Four 7" Zip Ties Owner's Manual (English/ French/ Spanish) Warranty information On-line product registration information Features & specs: Performance RMS Power Output (Watts x Channels) 50 x 4 Peak Power Output (Watts x Channels) 100 x 4 Power at 2 Ohms (Watts x Channels) 45 x 4 Power at 1 Ohm (Watts x Channels) --- Bridged Power (Watts x Channels) 100 x 2 Minimum Impedance Bridged 4 Minimum Impedance Unbridged 2 Best Frequency Response 15-50k Hz THD at Rated RMS Power 1% Signal to Noise Ratio 82 dB Input Voltage 14.4v Features Amplifier Class D Built-in DSP No Remote Control No Low-Pass Crossover Frequency N/A Low-Pass Slope (dB/octave) N/A High-Pass Crossover Frequency Off, 60, 80, 120Hz High-Pass Slope (dB/octave) 12 dB/octave Bass Boost No Bass Boost Frequency N/A Fan Cooled No Fuse Rating 20 Speaker Level Inputs Yes Preamp Outputs No Width (inches) 7 Height (inches) 1-3/8 Depth (inches) 3-9/16 Parts Warranty 1 Year Labor Warranty 1 Year The Alpine KTA-450 Power Pack replaces these items: Alpine KTP-445U Power Pack Features Overview: The Alpine KTP-450 is a Power Pack series amplifier, meaning it's small, and can often be mounted in close proximity to the head unit. Note: This high-powered amp won't work in systems where an outboard factory amplifier is active. If the vehicle has a factory amplifier, the factory amp must be completely bypassed (this may result in lost speaker channels, if factory amp has more than 4 channels). Mounting: Two types of mounting brackets are included with the amp, plus four zip ties. The first mounting bracket is designed to mount the amp to the back of Alpine's iLX-W650, iLX-W670, or iLX-407 digital multimedia receiver. The iLX-W650 is just over 2¾" deep by itself, so even with the added depth of the amp (totaling just over 5"), the combination fits in almost any dash with a Double DIN opening. The bracket also leaves a gap of approximately ¾" between the amp and head unit, so most of the wiring can be routed to that space. The second option is a pair of universal brackets that bolt to the ends of the amp, and provide a mounting flange with four screw holes. The chassis of the amp also has four tabs, through which the included zip ties can be looped to attach the amp behind the dash. CTA-2006 Compliant: CTA-2006 is a system of testing and measurement for mobile audio amplifiers. This voluntary standard advocates a uniform method for measuring an amplifier's RMS power output and signal-to-noise ratio. The criteria for measuring amplifier power uses a DC input voltage of 14.4 volts and the RMS power output is measured over a frequency range of 20 Hz to 20 kHz (for full range amplifiers), with 1% or less Total Harmonic Distortion plus noise (THD+N). Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4 ohms. CTA-2006 standards allow consumers to compare car amplifiers and receivers under the same conditions (apples to apples). CTA-2006 Specifications: Power Output: 50 watts RMS x 4 into 4Ω Signal to Noise Ratio: 82 dBA (measured at 1 watt into 4Ω) Other Specifications: Power Output: 2Ω: 45 watts RMS x 4 (14.4 volts, =1.0% THD+N) Bridged: 100 watts RMS x 2 (4Ω minimum) Signal to Noise Ratio: 95 dB (at rated power output into 4Ω) THD+N:
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