Alpine MRD-M605: for subsonic noise

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Alpine’s MRD-M605 is great for those of us who like the seismic reverberation of submarines. It has impressive features that unfortunately are not usually written in English. Here, I will do my best to translate your technical jargon into everyday English. I guess this would help you decide if it’s what you really want or need.

Main features and what they mean in everyday English…

The MRD-M605 is a mono V12 AccuClass-D amplifier. Class D in the amplifier rating tells you that it is a highly efficient amplifier. Gives a high yield per input. That is, it doesn’t draw too much current to give this massive power. It’s about 80% efficient, and that’s huge. It makes sure your car lights don’t dim because your subwoofers are kicking. The design employed by Alpine to achieve this also ensures that the signal remains pure.

You can give this amp a bass boost at 45Hz and this is adjustable in 2dB steps from 0 to 16.

It has a built-in Variable Crossover: First, here’s what a crossover is…

A crossover is a passive device or circuit used in systems with separate tweeter and/or midrange speaker drivers. Blocks certain (preset) frequencies that a particular speaker should not handle. This ensures that each speaker is dealing with a particular frequency range that it is most apt to drive.

So now you can understand the figures that follow.

The MRD-M605 has a built-in low-pass crossover that can be adjusted from 30 to 200 Hz with 13 settings. Just understand that a low pass crossover allows low frequencies to pass through.

Has a subsonic filter: There are subsonic sounds that aren’t crucial to quality bass production (unless you’re playing music for whales or elephants). These frequencies often consume a lot of power without adding anything positive to the audio experience. This filter removes those frequencies. It’s switchable between 15Hz and 30Hz. It can also be turned off if you decide you’re missing out on some essential buzz.

The MRD-M605 supports the installation of multiple amplifiers: this means that you can use two of these amplifiers to drive a DVC woofer. Any amp can do this, but a digital trim helps you make sure the outputs are identical.

It has a 3-way protection circuit: This is a circuit design that protects your amplifier from excessive current (popularly called a short circuit), excessive voltage, and overheating or thermal overload. The particular reason/cause for entering this “protection” mode is also displayed on the LCD screen.

With this screen you can also monitor the DC input and the internal temperature in Fahrenheit or Celsius. It also shows audio information like EQ, gain, etc.

It has an aluminum cover that lifts up to reveal the LCD screen and control panel. This control has up and down buttons with which you can scroll through the menu and make adjustments to the amp. You can still see the LCD screen when it’s closed through a plastic window.

The MRD-M605 has an RMS power rating (measured at 14.4V) of 400 watts x 1 into 4 ohms and 600 watts x 1 into 2 ohms. The minimum impedance of this amplifier is 2 ohms.

The only difference between the MRD-M605 and the MRD M1005 is the power rating…

The RMS power rating (also measured at 14.4V) for the MRD M1005 is 700 watts x 1 at 4 ohms and 1000 watts x 1 at 2 ohms.

So if you need more power than the MRD-M605 can deliver, upgrade or choose the MRD M1005.

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