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.
Notes: Do not install this amplifier
vertically or at an incline. Any installation other than
parallel to the vehicle floor, invalidates the warranty.
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 (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
- 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.
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,