Features
Controls
Connections

Features

PDX Amplifier Design: Class-D amplifiers boast higher efficiency, produce much less heat, and draw less current than traditional Class AB amps. The PDX series is Alpine's super-efficient power density design of full range class-D amps. They combine MOSFET power supplies, MOSFET final outputs, and a thermal management processor, along with a 4-Layer Glass Epoxy PC Board to create a high-end sound quality without the bulky heat sinks required by most amps with this much power.

STAR Topology: Alpine's unique STAR (Signal Transit for Accurate Response) Circuit PCB design provides a single common ground for all amp sub-blocks, preventing ground interference and minimizing internal noise.

Terminal Layout: For wiring convenience all the inputs and outputs on the amp are on the rear of the amplifier.

Verification Certificate: The amplifier comes with a certificate that lists the RMS power output of the individual amplifier. It also lists the model number, serial number, test date, and the test conditions (14.4 volts, 4 ohms).

5-Channel Configuration: The PDX-5 is a 5-channel amplifier, designed to power four full-range speakers and a subwoofer. The amp provides 75 watts per channel at 4 ohms to the four full-range channels, and 300 watts at 4 ohms or 2 ohms to the subwoofer channel.

Crossovers: The front and rear channels have independent crossovers that can be set for high-pass, low-pass, or Off (for full-range operations). The crossovers are continuously variable from 30-400Hz with a slope of 12 dB per octave. The mono subwoofer channel has a 50-200 Hz low-pass filter with a 24dB per octave slope. The mono channel also has a fixed 15 Hz, 24dB per octave subsonic filter to eliminate power-robbing super low frequencies that can also damage speakers.

Speaker Connectors: The PDX series amps use a new Speaker Quick Connect plug to attach the speaker wires to the amp. Bare speaker wire, up to 8 gauge, is held in place by a set screw, the Quick Connect plug then plugs into the amp. Like an RCA jack, the Quick Connect plug uses a center positive layout, so it fits two ways and both maintain correct polarity.

Stack Amps: Because the PDX series design generates so little heat, up to three amps can be stacked and bolted together. All the amps in the series; PDX-5, PDX-2.150, PDX-4.100, PDX-4.150, PDX-1.600, and PDX-1.1000 share the same footprint, so they can be stacked together.

LED: The top mounted LED Power/Status indicator glows blue when operating normally and red when one of the protection circuits engages.

Protection Circuits: This amplifier includes protection circuits to prevent damage due to the following conditions: ambient temperature too high, supply current too high, short to ground, or over voltage.

Controls

Controls (front of unit): Once set, the controls are covered by a door to prevent accidental adjustments:

• Crossover Mode switch: set to HP (high pass), OFF (full range) or LP (low-pass), separate controls for the front and rear channels
• Crossover Frequency (channels 1-2 and 3-4): rotary controls used to select the crossover frequency, separate controls for the front and rear channels, variable from 30 to 400Hz
• Crossover Frequency (channel 5): rotary control used to select the crossover frequency for the mono channel, variable from 50 to 200Hz
• Gain Controls: rotary controls used to set the amplifier's gain according the level of the incoming signal, separate controls for the front, rear, and mono channels, continuously variable from Min (0.2V) to Max (4.0V), with marks at Nominal and 0.5V.

Connections

Inputs and Outputs (rear of unit):

• Power and Ground terminals: power and ground terminals are gold plated set screw terminals, will accept up to 4 gauge bare wire
• Remote Turn-on terminal: gold plated set screw terminal, will accept up to 10 gauge bare wire
• Speaker terminals: each of the 5 speaker outputs uses Alpine's Speaker Quick Connect plug
• Line Level Input: 6 female RCA jacks, left and right for the front, rear, and subwoofer channels, gold plated