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Subwoofers
4ohms vs. 2ohms
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<blockquote data-quote="swimfreak26" data-source="post: 569663" data-attributes="member: 544365"><p>The basic question of this thread is: What is an Ohm?</p><p></p><p>An ohm is a unit of resistence, in car audio it measures (most commonly) the resistence of a voice coil.</p><p></p><p>So what does this mean?</p><p></p><p>This basically is a measure of how hard the amp has to work (at a very basic level) to produce power. For example, if you're using a 4ohm driver, your amp will work twice as hard to produce the same power as if you were using a 2ohm sub. Now, since amps only do one amount of work...they differ in how much power they are able to produce at each impedence (ohm load) which is why an amp is rated higher at a lower impedence.</p><p></p><p>So how do I get different ohm loads?</p><p></p><p>This requires physics, and the wiring of the different poles of the coils together in different arrangements. These different arangements allow the amp to "see" a different load, and it views all (all in one channel) of the coils (resistors) as one big one.</p><p></p><p>Equations for wiring resistors together:</p><p></p><p>In series (positive to negative): R1 + R2 = R total</p><p></p><p>EX: 2 ohm in series with a 2 ohm = 4ohm final load</p><p></p><p>In parallel (negative to negative): 1/R1 + 1/R2 = 1/R total</p><p></p><p>EX: 2 ohm in series with a 2 ohm = 1ohm final load</p><p></p><p>So, in your case you have 2 DVC 4ohm subs:</p><p></p><p>Each sub can be wired to 2 ohms (in parallel)</p><p></p><p>Each sub is then connected to a channel and the amp sees a 2 ohm load on that channel, delivering 600watts</p><p></p><p>I did notice that your amp is a class d amp though, and generally they are mono amps, rather than 2 channel. If that's the case, see what the minimum impedence rating of the amp is and we can help you to wire your subs to get the most out of it. I hope this clears some confusion many noobs have.</p></blockquote><p></p>
[QUOTE="swimfreak26, post: 569663, member: 544365"] The basic question of this thread is: What is an Ohm? An ohm is a unit of resistence, in car audio it measures (most commonly) the resistence of a voice coil. So what does this mean? This basically is a measure of how hard the amp has to work (at a very basic level) to produce power. For example, if you're using a 4ohm driver, your amp will work twice as hard to produce the same power as if you were using a 2ohm sub. Now, since amps only do one amount of work...they differ in how much power they are able to produce at each impedence (ohm load) which is why an amp is rated higher at a lower impedence. So how do I get different ohm loads? This requires physics, and the wiring of the different poles of the coils together in different arrangements. These different arangements allow the amp to "see" a different load, and it views all (all in one channel) of the coils (resistors) as one big one. Equations for wiring resistors together: In series (positive to negative): R1 + R2 = R total EX: 2 ohm in series with a 2 ohm = 4ohm final load In parallel (negative to negative): 1/R1 + 1/R2 = 1/R total EX: 2 ohm in series with a 2 ohm = 1ohm final load So, in your case you have 2 DVC 4ohm subs: Each sub can be wired to 2 ohms (in parallel) Each sub is then connected to a channel and the amp sees a 2 ohm load on that channel, delivering 600watts I did notice that your amp is a class d amp though, and generally they are mono amps, rather than 2 channel. If that's the case, see what the minimum impedence rating of the amp is and we can help you to wire your subs to get the most out of it. I hope this clears some confusion many noobs have. [/QUOTE]
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