Features Controls Connections
X-Series Amplifiers: Alpine's X-Series amplifiers are
designed for high performance, low distortion, power, and reliability. With
Alpine ID (Image Defined), this Class-D amplifier delivers the imaging and sound
stage depth that has been missing in most car audio systems. Alpine's
proprietary circuit design provides the cleanest possible signal path, plus a
dual-feedback loop, to meet and exceed the audio standard for High Resolution
playback (full range amps only). The solid cast aluminum heat sink keeps the amplifier cool, even at
peak power levels. Each X-Series amplifier comes with its own Alpine
Verification Certificate, showing the tested power output at 2Ω at 14.4 DC
Channel Design: The Alpine X-A90M is a mono amplifier,
dedicated to driving subwoofers. It is stable
down to 2Ω.
CTA 2006 Compliant: The X-A90M's power ratings are measured
according to the strict standards dictated by the Consumer Technology
Association (CTA). These standards allow you to accurately compare the rated
power output of all CTA 2006-compliant amplifiers, even if they come from
different brands. Manufacturers who adhere to the standards can display the CEA
2006 logo on their products and packaging. The CTA 2006 power output specs for
the X-A90M are:
- 4Ω: 600 watts
RMS x 1 @ 14.4 Volts
- 2Ω: 900 watts
RMS x 1 @ 14.4 Volts
Frequency Response: The Alpine X-A90M has the following
- +0/-3 dB (1W into 4Ω): 8 Hz - 400 Hz
- +0/-1 dB (1W into 4Ω): 10 Hz - 300 Hz
Terminal Covers: The X-Series amps each have removable
silver terminal covers on the front and sides that improve the appearance of the
amplifier. Once you have made all of the connections and confirmed proper
operation, you can attach the terminal covers by snapping them into place.
Logo Badge: The top of the amplifier features four bright
white LEDs that glow when the unit is powered on. A self-adhesive Alpine Logo
Badge is provided for placement over the LEDs so that the logo glows blue when
lit. You can choose the orientation of the logo depending upon the installation.
Hidden Controls: The amplifier's controls are
hidden behind a removable top panel. The panel can be lifted by removing
two hexagon screws with the supplied 2mm Allen wrench.
Gain Control: The X-A90M's rotary gain control lets you set the amplifier's gain according to the level
of the incoming signal. The amp will accept low level signals from 0.1V to 4.0V,
or high level signals from 0.5V to 10V. An input level switch on the front panel
should be set to match the type of input signal used.
Crossover: The Alpine X-A90M offers a Low-Pass Filter with a
variable cutoff frequency of 50Hz to 400Hz. The Subsonic Filter cuts off
super-low frequencies that the subwoofer cannot cleanly reproduce. The cutoff
frequency is variable from 8Hz to 40Hz. Both filters have a slope of 24dB per
Bass EQ: The amplifier has a variable Bass EQ (or Bass
Boost) circuit that raises the level of the amplifier output at 50Hz from 0dB to
Optional Remote Bass Control: The amplifier has an RJ-25
modular jack for adding the optional
RUX-KNOB.2 Remote Bass
Level Control for controlling the amp output remotely. The RUX-KNOB.2 has a 20dB range
of linear adjustment.
Terminal Layout: For wiring convenience, all of the inputs
and outputs on the amplifier are on one side.
Quick Connect Plugs: The X-Series amplifier uses quick
connect plugs to attach your system's speaker wires and power cables to the amp
for a simple, error-free installation. The quick connect plugs have set screw
terminals that can be tightened/loosened by the supplied hex wrenches (2mm or
4mm). The power, ground, and remote turn-on connections are made to a single
quick connect plug. The power and ground terminals will accept up to 4 AWG
(recommended) wire, while the remote terminal will accept up to 12 AWG. The
speaker output plug has terminals for two speakers which allows you to connect
two subwoofers or a single dual voice coil sub. The
speaker terminals will accept up to 8 AWG wire.
Input: The Alpine X-A90M is equipped with one
pair of RCA jacks for connecting low-level or high-level input signals. If
connecting the source unit's speaker wire to the input jacks, you can use a
Speaker-to-RCA adapter or splice an RCA plug onto the speaker wire. When using a
high-level input signal, it may not be necessary to connect a remote turn-on
lead because of the amplifier's remote sensing function.
Pre-Output: A second pair of RCA jacks provides a line level
output for sending a signal to a second subwoofer amplifier. The output matches
the input signal, and is not affected by the amplifier's crossover.
Fuses: The Alpine X-A90M is equipped with three 30-amp ATO
fuses. A 90A external fuse should be placed on the +12V power wire within 18" of