Our Product Research Team
At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere.
That's because we have our own in-house Product Research team — they open the box,
verify contents, check the owner's manual, and record dimensions, features and specs.
We stay on top of new products and technologies to help people make informed choices.
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 totally new
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.
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.
Also called an
infrasonic filter, a subsonic filter cuts off extremely low bass (below the
range of human hearing) that many speakers cannot effectively reproduce,
thereby making the amp's power supply and output devices, and the speaker,
For wiring convenience all the inputs and outputs on the amp are on one
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).
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. The two speaker terminals are shorted together, so if
you're only using one sub you can connect to either terminal.
Line Level Output: In addition to the line
inputs, the PDX-1.1000 has non-fading left and right
female RCA outputs for extra system flexibility.
Stack Amps: Because the PDX series design
generates so little heat, up to three amps can be stacked and bolted together.
All three amps in the series, PDX-2.150, PDX-4.150, and PDX-1.1000 share the
same footprint, so they can be stacked together.
Notes: When stacking multiple amplifiers, do not install vertically or at an incline. Any stack installation other than parallel to the
vehicle floor, invalidates the warranty.
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
- ambient temperature too high
supply current too high
short to ground
Controls (front of unit):
Once set, the controls are covered by a door.
- Crossover Frequency:
rotary control to select the low pass crossover frequency, variable from 50 to
200Hz, 24 dB/octave
- Gain Control: rotary
control to set the amplifier's gain according the level of the incoming
signal, continuously variable from 0.2V to 4.0V
- Gain Range: select 0.1-1.0 volt or
1.0-8.0 volt range for the rotary control
- Subsonic Filter:
off, 15 Hz, or 30 Hz
Inputs and Outputs (rear of
- Power and Ground terminals: power and ground terminals are
gold plated set screw terminals, will accept up to 4 gauge bare wire, Alpine
recommends 6 gauge wire minimum
- Remote Turn-on terminal:
gold plated set screw terminal, will accept up to 10 gauge bare wire
Speaker terminals: each
speaker output uses Alpine's Speaker Quick Connect plug
Line Level Input: Left and right
female RCA jacks, gold plated
- Line Level
Output: Left and right
female RCA jacks, gold plated