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<blockquote data-quote="zako" data-source="post: 7949880" data-attributes="member: 629735">I think it&#039;s just the NX series. I have seen a test of NX4 in avtozvuk.com (Russian) showing that it does 65-ish watts at 4ohm and about 105 ish at 2ohm with a 14.4 battery, while the factory rating is 100/200. Now someone mentioned that Massive Audio&#039;s RMS watt rating may be still compliant with CEA standards or whatever, because Massive Audio may be doing its tests differently (perhaps with a speaker connected instead of a resistor) but still in an entirely acceptable manner. Nonetheless, you can&#039;t do an apples to oranges comparison because no one or almost no one else does this. Mind you, it&#039;s still a good amplifier, with very low THD at either 2 or 4ohm, good channel separation, etc. However, the wattage rating is totally oversold. Good amplifier, but highly sensitive to installation details since it&#039;s class A/B amp in a tiny package.&nbsp; In reality, NX5&#039;s output is about the same as that of Alpine MRX V60/V70 at best, but Alpine will run cooler since it&#039;s a Class D amp of about the same size.Another giveaway is the recommended fuse rating for these amps. Someone posted on DIYMA a list of suggested fuses for the NX amps. For NX4, they recommend a 40amp fuse. If you do a survey of Class A/B amplifiers, a realistic output for a Class A/B amp is probably 4x60-80watts RMS at 4ohm on each channel with such current draw.</blockquote>

[QUOTE="zako, post: 7949880, member: 629735"] I think it's just the NX series. I have seen a test of NX4 in avtozvuk.com (Russian) showing that it does 65-ish watts at 4ohm and about 105 ish at 2ohm with a 14.4 battery, while the factory rating is 100/200. Now someone mentioned that Massive Audio's RMS watt rating may be still compliant with CEA standards or whatever, because Massive Audio may be doing its tests differently (perhaps with a speaker connected instead of a resistor) but still in an entirely acceptable manner. Nonetheless, you can't do an apples to oranges comparison because no one or almost no one else does this. Mind you, it's still a good amplifier, with very low THD at either 2 or 4ohm, good channel separation, etc. However, the wattage rating is totally oversold. Good amplifier, but highly sensitive to installation details since it's class A/B amp in a tiny package. In reality, NX5's output is about the same as that of Alpine MRX V60/V70 at best, but Alpine will run cooler since it's a Class D amp of about the same size. Another giveaway is the recommended fuse rating for these amps. Someone posted on DIYMA a list of suggested fuses for the NX amps. For NX4, they recommend a 40amp fuse. If you do a survey of Class A/B amplifiers, a realistic output for a Class A/B amp is probably 4x60-80watts RMS at 4ohm on each channel with such current draw. [/QUOTE]

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