Overview: The Alpine PXE-H650 System
Processor accepts input from nearly any factory or aftermarket radio, removes
any existing equalization, and adjusts to overcome acoustic shortcomings of the
specific vehicle's interior. A preamp signal then feeds your
aftermarket amplifiers and speakers, allowing a substantial sound quality
upgrade without sacrificing any OEM features (CD changer, DVD system, satellite
radio, Bluetooth integration, etc).
The 5-channel auto ranging input will accept either speaker level or line level
inputs. Typically the 5 channels are front left/right, rear left/right, and
subwoofer. If the factory system has no subwoofer, that input is not used. A
left/right tweeter and left/right woofer signal is also compatible. If you have
an aftermarket head unit with preamp outputs, the RCA input can be used instead.
When the auto ranging input is used for the main signal, the RCA inputs can be
used for an auxiliary source.
There are seven RCA outputs:
- Left/Right Front (1):
high-pass; use for tweeters in a bi-amp front component set
- Left/Right Front (2):
band-pass or high-pass; band-pass for woofers in a bi-amp front component
set or high-pass for a component set (not bi-amp) or full range speakers
- Left/Right Rear:
high-pass; rear speakers
single subwoofer output jack
Auto Ranging Input:
Once connected, the first step in the automatic calibration is measuring and
compensating for the factory output so each channel is at the correct level.
Before starting, the balance and the fader are centered, and the volume is set to
approximately 3/4 (the volume on the factory radio is left here, future volume
adjustments are made using the PXE-H650's remote control).
Next, playing the included setup disc, the AntEQ analyzes the factory radio
output relative to the fixed test sound patterns, and removes any equalization;
creating a flat, full range signal.
After the AntEQ has created a baseline (flat) input signal, the Audyssey MultEQ
uses the setup disc and included microphone to measure the effect the car has on
the test track output. Absorption by soft surfaces, reflection by hard surfaces,
and delay caused by speaker placement are measured at several listening
positions (4 minimum, 8 maximum). Once the data are collected, an EQ curve is
created to correct the coloring of the sound by the car's interior and each
channel (up to seven) is time aligned to optimize the image at the first two
listening positions (the first two positions are memorized as user presets).
Optimum crossover points (if needed) are also measured and saved for each
You can further tailor the sound to your personal taste after the Audyssey
MultEQ has corrected for the listening environment. Each channel has a 3-band
parametric equalizer, additional time correction, and crossover adjustments.
The EQ is adjusted for each channel individually and separate curves are
memorized for the Auto Ranging and Aux inputs:
the three bands range +/-6 dB in 1 dB increments
the width of the EQ band is adjustable from 0.5 to 2.0 in 0.5 steps
the center frequency each EQ band is adjustable:
30, 40, 50, 60, 80, 100, 125, or 150 Hz
500, 750, 1k, 1.5k, 2k, 3k, 4k, or 5kHz
6k, 7.5k, 10k, 12.5k, 15k, or 17.5kHz
Each set of preamp outputs (Front 1, Front 2, Rear, and Sub) has an adjustable
- Front 1:
this high-pass tweeter output is only used if you bi-amp the front component
speakers; adjustable from 200 Hz to 5 kHz, the slope is 12 dB/octave
- Front 2:
when you bi-amp the front speakers this becomes a band-pass crossover;
LPF: 200 Hz to 5 kHz, HPF: 50 Hz to 200 Hz, both 12 dB/octave
- Not bi-amp:
when you don't bi-amp the front speakers this is a high-pass crossover;
50 Hz to 200 Hz and 12 dB/octave
high-pass crossover; 50 Hz to 200 Hz, 12 dB/octave
low-pass crossover; 50 Hz to 200 Hz, 12 dB/octave
Each of the seven output channels can have additional signal delay assigned; 0
to 10ms in 0.1ms steps.
If you bi-amp the front component speakers, each tweeter and each woofer
is time aligned individually.
The USB port on the PXE-H650 is used for PC control interface.
Regardless of the unit's installation location, the included remote sensor can
be mounted in a convenient location and wired to the PXE-H650.
Wired Remote Input:
Like on many Alpine head units, there is a 3.5mm input for compatible steering
wheel remote adapters.
An automatic signal sensing circuit turns on the processor along with your
radio. When the input signal is absent for 5 minutes, the system turns off.