Inputs and Outputs Notes
V12 AccuClass-D Mono Amplifier:
The V12 AccuClass-D amplifier design allows it to deliver massive power without
correspondingly huge current draw. This amplifier's true digital design keeps
the signal purer and makes the amp extremely efficient. V12 AccuClass-D amps use
digital signal processing to provide time correction and other sophisticated
controls, all controlled through the Alpine Digital Control Center located under
the top-mounted access panel.
Hood: The amplifier has a
hinged brushed aluminum hood that flips up to reveal the control panel and LCD display. The control panel consists of
six buttons: Display, Mode (up), Mode (down), Enter, <, and >. These buttons are used to
navigate the menu that includes all the adjustments on the amp (input level,
crossover, EQ, time correction, phase, etc). When closed, the LCD display is
visible through the smoked plastic window. Two Allen-head screws (supplied) secure
the hood in the closed position.
Display Control: The MRD-M301
features a 5-digit information display that allows you to check the operational
status of the amplifier. By pressing the Display button, you can cycle through
the following readouts: Voltage (supply), Current (draw), Internal Temperature
(Fahrenheit), and Internal Temperature (Celsius).
Terminal Cover: The
amplifier is equipped with a silver brushed aluminum terminal cover that can be
attached to the front panel to
improve appearance after the amplifier has been installed. The terminal cover
hides power, signal and speaker wires, and secures to the amplifier via two
Allen-head screws (supplied).
Verification Certificate: The
amplifier comes with a certificate that informs you of the total RMS output of
the particular amplifier. It lists the model number, serial number, test date,
and the test conditions (voltage, impedance).
Bass Engine DSP: The MRD-M301
uses digital signal processing to offer several sophisticated Bass Engine controls
without signal loss or sound degradation. The Bass Engine features include:
- Digital Time Correction: Time
correction allows you to time align this amp with others in the system. This is
particularly useful to maximize SPL if there are multiple subs and sub amps. The
adjustment range runs from 0-10ms in 0.1ms steps.
- Digital Parametric Equalizer: A fully
adjustable parametric EQ is built into this amp. The center frequency is
adjustable from 30 to 160Hz in 1/12 octave steps. The Q value of the EQ curve is
selectable between 0.5, 1, 2, 3, 4, and 5. The EQ level is adjustable from -12dB
to +12dB in 1dB steps.
- Built-in Variable Crossover: The built-in low-pass crossover is adjustable from 30 to 200Hz in
1/12 octave steps with a selectable slope of 12dB/octave or 24dB/octave.
- Subsonic Filter: The
filter is used to filter out low frequencies that you cannot hear but can
"rob" power from the amplifier. The crossover point is variable
between 15Hz and 50Hz in 5Hz steps, and can be switched on or off.
- Bass Compensation: The Bass
Compensation circuit is used to enhance low-end bass definition. When engaged,
the Bass Compensation circuit provides bass with sharp auditory impact, even
with a small diameter woofer. Once turned on, you can select the Bass
Compensation level that best suits your desired results: Bass Comp 1, Bass
Comp 2 or Bass Comp 3.
- Phase Control: The phase is
selectable between 0 and 180 degrees.
Gain Factor: Gain Factor is a
unique and patent-pending digital processing technology that allows more audible
power to be delivered even when pushing the amplifier to its limit. Unlike all
analog compensation techniques, Gain Factor interpolates and modifies the signal
at the individual digital data level, enhancing smaller signals more and larger
signals less without driving the amplifier into hard clipping. The result is
more clean power, sooner on the volume knob. You can select a gain factor of
0dB, +6dB or +9dB.
Multi-Amp Installation: Because
the above Bass Engine adjustments are all digital and discrete, two of these amplifiers can
be used to power the two voice coils of a DVC woofer. Note: Technically this is true
of any amp, but with analog adjustments an oscilloscope is needed to ensure the
outputs are identical.
Amplifier ID: Alpine's RUX-4280
Remote Amplifier Control Center (RACC) will control up to eight V12
AccuClass-D amplifiers. For this reason each amp needs its own ID when more than
one amp and the RACC are used.
Optional Remote Level Control: This
amplifier's level can be controlled remotely with the optional RUX-4180
Subwoofer Level Control. Note: The RUX-4180 can only control one
amplifier. For multiple amplifiers, the RUX-4280 Remote Amplifier Control Center
should be used.
Turn On Delay: The amp's turn-on
time is adjustable from 0 to 2 seconds in 0.2 second steps. This is useful for eliminating the loud "thump"
that occurs when multiple amplifiers are turned on simultaneously.
Output Disable Mode: The Output
Disable Mode turns
off the power output of the amp while leaving the control functions active. This
should be used when adjusting the DSP function. Only the power of the DSP
circuit is on and in the current saving state. After making adjustments, the
output disable mode should be turned off.
Memory: The settings on the
amp can be stored in one of two memory slots to make it easy to return to your preferred values.
amplifier has a 3-way protection
circuitry to guard against accidents and undesired operations. It includes
protection for Short
circuit, Over-voltage, and Thermal overload. When the amplifier goes into
protection mode, the LCD display will show a Error code explaining the cause of
Inputs and Outputs
Notes Wire Terminals: The battery,
ground, remote, and speaker output terminals all feature combination gold-plated
screw terminals which can accept a ring or spade connector up to 5/16" wide
(.3125") or directly accept up to 8 gauge bare wire. A Phillips-head or
flat-head screwdriver is required to loosen/tighten the terminal screws.
Level/Speaker Level Input: The amplifier
includes a pair gold-plated RCA stereo line input jacks. For a speaker level
input, you must use the supplied harness. The harness has a pair of male
gold-plated RCA plugs on one end, a resistor circuit in the middle, and bare
wire on the other end.
Controller: The amp has a 7-pin
female DIN jack for
connection to the RUX-4280 Remote Amplifier Control Center (RACC) or the
RUX-4180 Subwoofer Level Control.
RMS Power Rating
(measured at 14.4V):
- Into a
4-Ohm Load: 175 watts x 1
- Into a 2-Ohm Load: 350 watts
RMS Power Rating
(measured at 12.0V):
- Into a
4-Ohm Load: 150 watts x 1
- Into a 2-Ohm Load: 250 watts
Note: Minimum impedance is 2