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Car Audio Equipment
Amplifiers
Sizing amp to subs
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<blockquote data-quote="army5" data-source="post: 6330646" data-attributes="member: 596713"><p>I know you want to try and match RMS ratings of both. However here is my scenario: I have 3 8-ohm subs rated at 425rms. I would like an amp that can push close to the 1275 rms at my 2.67 Ohm rating. Problem is all amp specs show 4, 2 and 1 Ohm ratings. Taking this plus typical voltage drop, efficiency ratings and imp rise what would be a good match. My thought is to be a little on the big side and set gains accordingly.</p><p></p><p>I know this is crude but this is what I've been using to calculate: 2 Ohms / 2.67 Ohms = 75%. Take 75% of rms ratings @ 2 Ohms and then another 75% for efficiency. So for example the ap3001d I would get (2000 * 75%) * 75% = 1125watts. Close enough considering cost and my budget.</p><p></p><p>So is the above a safe assumption or am I way off? Since amp is pushing less than half of rated would stock electrical with Big 3 and 1/0 ga wire be sufficient?</p></blockquote><p></p>
[QUOTE="army5, post: 6330646, member: 596713"] I know you want to try and match RMS ratings of both. However here is my scenario: I have 3 8-ohm subs rated at 425rms. I would like an amp that can push close to the 1275 rms at my 2.67 Ohm rating. Problem is all amp specs show 4, 2 and 1 Ohm ratings. Taking this plus typical voltage drop, efficiency ratings and imp rise what would be a good match. My thought is to be a little on the big side and set gains accordingly. I know this is crude but this is what I've been using to calculate: 2 Ohms / 2.67 Ohms = 75%. Take 75% of rms ratings @ 2 Ohms and then another 75% for efficiency. So for example the ap3001d I would get (2000 * 75%) * 75% = 1125watts. Close enough considering cost and my budget. So is the above a safe assumption or am I way off? Since amp is pushing less than half of rated would stock electrical with Big 3 and 1/0 ga wire be sufficient? [/QUOTE]
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