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Ships to:
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Ships to:
United States

Details about  Alpine MRD-M301 Car Amplifier

Alpine MRD-M301 Car Amplifier See original listing
Item Sold
Item condition:

Works great, no longer needed, sold as is.

Jan 07, 2014 14:00:48 PST
Winning bid:
US $51.00
6 bids ]
$23.40 Expedited Shipping | See details
Item location:
Hamilton, Michigan, United States


eBay item number:
Seller assumes all responsibility for this listing.

Item specifics

Condition: Used : Split the cost with friends
An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. See all condition definitions- opens in a new window or tab
Seller Notes: Works great, no longer needed, sold as is.








Detailed item info

Product Identifiers

Key Features
Amplifier TypeMono Channel
Input Voltage12 volt
BridgeableNot Bridgable
RMS Power at 2 Ohms350 W x 1
RMS Power at 4 Ohms175 W x 1

Frequency Response20 Hz - 0.2 Hz
Signal to Noise Ratio60 dB

Crossover / Equalizer
Bass BoostWith Bass Boost
Low - Pass Frequency30 Hz - 200 Hz

Technical Features
MOSFET CircuitryYes
3 Way ReadyNo

Width13.75 in.
Height2.56 in.

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 subsonic 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.

3-Way Protection Circuitry: This 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 the failure.

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.

Line 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 x 1

RMS Power Rating (measured at 12.0V):

  • Into a 4-Ohm Load: 150 watts x 1
  • Into a 2-Ohm Load: 250 watts x 1

Note: Minimum impedance is 2 Ohms.

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