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Wiring, Electrical & Installation
Do I need to upgrade my alternator/battery?
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<blockquote data-quote="quackhead" data-source="post: 7798881" data-attributes="member: 573547"><p>Since there is only a 200 watt difference in 4 ohm power and the minimum 2 ohm power, the efficiency will be much better at 4ohms.</p><p></p><p>4ohms at rated 80% efficiency @ 14.4v:</p><p></p><p>300w/.80 = 375 watts input</p><p></p><p>375/14.4 = 26 amps</p><p></p><p><strong>4 ohm current draw : 26 amps</strong></p><p></p><p>2ohms at 500 watts with a realistic 70% efficiency at 14.4v:</p><p></p><p>500w/.70 = 714 watts input</p><p></p><p>714w/14.4 = 49.5 amps</p><p></p><p><strong>2 ohm current draw: 49.5 amps</strong></p><p></p><p><strong>the difference between 300 watts and 500 watts is about 2db, barely audible</strong>. The 23.5 amps difference between 2 ohm and 4 ohm usage of the amplifier could be the difference between headlights flickering at night or not on your car.</p><p></p><p>So yes, I would fell very comfortable saying that if you used the MRP-M500 at 4 ohms, you will be fine.</p><p></p><p>One more side note - at 4 ohms rated power the amp produces<strong> .08% distortion</strong>, which is inaudible.</p><p></p><p>At 2 ohms rated power, it produces <strong>1% distortion </strong>which can be audible at that power level.</p><p></p><p>hope this helps</p></blockquote><p></p>
[QUOTE="quackhead, post: 7798881, member: 573547"] Since there is only a 200 watt difference in 4 ohm power and the minimum 2 ohm power, the efficiency will be much better at 4ohms. 4ohms at rated 80% efficiency @ 14.4v: 300w/.80 = 375 watts input 375/14.4 = 26 amps [B]4 ohm current draw : 26 amps[/B] 2ohms at 500 watts with a realistic 70% efficiency at 14.4v: 500w/.70 = 714 watts input 714w/14.4 = 49.5 amps [B]2 ohm current draw: 49.5 amps[/B] [B]the difference between 300 watts and 500 watts is about 2db, barely audible[/B]. The 23.5 amps difference between 2 ohm and 4 ohm usage of the amplifier could be the difference between headlights flickering at night or not on your car. So yes, I would fell very comfortable saying that if you used the MRP-M500 at 4 ohms, you will be fine. One more side note - at 4 ohms rated power the amp produces[B] .08% distortion[/B], which is inaudible. At 2 ohms rated power, it produces [B]1% distortion [/B]which can be audible at that power level. hope this helps [/QUOTE]
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