Alpine KTA-450 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 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: <0.1% (at rated power into 4Ω or 2Ω)
• Frequency Response: 15 Hz to 50 kHz (+0/-3 dB)

Controls: There are DIP switches on the amp to set input signal type, output configuration, and independent controls for the front and rear channel gain and crossovers:

• Gain: two rotary controls; adjustable from 152mV to 2.8 volts line level and 330mV to 6.05 volts speaker level
• High Pass Crossover: select 60Hz, 80Hz, 120Hz, or Off (full range)
• Input Type: set to RCA (line level) or speaker level
• Amp Configuration: 4-channel or 2-channel (bridged)

Harness: All the wiring for power, input, and output is in one harness. The wires in the harness are one foot long and it plugs into a recessed area on the amp, with openings on the side and bottom, so the wires can be routed in either direction.

Power/Ground: The power and ground wires in the harness are 14-gauge. (Actually each has two 16-gauge wires from the harness, merged to a single 14-gauge wire.) The power wire should be extended and connected directly to the battery, using an in-line 20-amp fuse near the battery terminal.

Note: Neither the amp nor the harness has a fuse, so using an in-line fuse at the battery is absolutely necessary.

Signal Inputs: There are four male RCA plugs on the included harness for line level inputs. If your source unit has no line level outputs, the RCA plugs can be cut off and a speaker level signal wired directly to the discrete positive and negative wires. (You can also use optional Speaker Wire to RCA adapters.)

Note: You will need to connect the amplifier's remote turn-on lead wire (blue/white) to your source unit's remote turn-on lead when using a line level (RCA) input. The amp has a remote sensing feature, so the remote turn-on connection is not necessary when using a speaker level input.

Speaker Output: The harness has unterminated wires for the four speaker outputs.

Dimensions: Because two types of brackets are included, the amp has multiple possible dimensions:

• Chassis Only:
  • Width: 7.0"
  • Height: 1.33"
  • Depth: 3.56"
• With Universal Brackets:
  • Width: 7.8" (includes mounting flange)
  • Height: 1.56"
  • Depth: 3.56"
• With Head Unit Bracket: for mounting to the back of the Alpine iLX-W650 or iLX-407
  • Width: 7.0"
  • Height: 3.56"
  • Depth: 2.23"