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Alpine class-D question

Old 11-04-2006, 01:44 PM
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Alpine class-D question

Does anyone know what the big difference between the Alpine V12 MRD-M605
and the same power rating (400W) V-power class D amp MRP-M650 is? My main concern is SQ and also ruggedness because I sometimes run them at high volume for prolonged periods, my last AB used to go to protect after a couple hours...
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Old 11-04-2006, 01:57 PM
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The main difference is in the digital display on the MRD. This allows you to set an amp's id number, shows the voltage the amp is recieving, what the bass boost is at, what frequencies the sub-sonic and LP filters are at, and the temperature the amp is in farenheit or celcius. Because of the digital display it is possible to have more than one amp driving seperate coils of a DVC subwoofer because you are guarenteed they have the same output signal. I doubt there is much difference other than this feature.
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Old 11-04-2006, 03:03 PM
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There is a lot of difference! Class D designs carry a whole different topology than your typical class a/b. Some of the things that differ......Power supply, processing (those are two big ones), output sections, and more. Class D amps tend to make their output power more efficiently than a/b designs. This is mainly because of the switching rate of the power supply. Class a/b amps will generally involve more heat, be less efficient, yet sound a little more musical in most opinions. Class D, in your case, is giving you an efficient amp with all kinds of processing power (in your MRD-M605). Which is the best for you? Well, you may want to try a D class amplifier if your problem is mainly just the thermal aspect. You can get good SQ out of either amp, but it does not solely depend on your amplifiers. The choice is yours....this is just to cover a few basics as to the differences between them.

Good luck
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Old 11-04-2006, 03:19 PM
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Both amps that he is looking at (the MRP-650 and MRD-605) are class D amps.
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Old 11-09-2006, 08:06 AM
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isn't the MRD-M605 digital and MRP-M650 is not?
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Old 11-09-2006, 08:42 AM
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looking at specs difference ->

Low Pass Crossover Frequency 50Hz - 200Hz
Subsonic Filter (Fixed): 15Hz
Bass EQ Frequency (Fixed): 50Hz 0 to +12dB

Low Pass Crossover Frequency 30Hz - 200Hz
Subsonic Filter Range : 15Hz - 50Hz (5Hz Steps) or OFF
i think Bass EQ Frequency is 0 to +16dB if i remember correctly
digital display

so appears that mrd-605 has bigger range of adjustments

Last edited by eg0r; 11-09-2006 at 09:44 AM.
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Old 11-09-2006, 09:11 AM
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I believe the MRD is digital and the MRP is class D,the 180 phase is nice if your amp is in a rack.the input impeadance is different on the two...check it on
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