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<blockquote data-quote="Warbleed" data-source="post: 2959847" data-attributes="member: 549898">It&#039;s a bit of a misnomer to call an 8 ohm driver more efficient than a 4 ohm driver based solely on that information. We can say that&#039;s true to an extent if we are holding coil material as a constant, but that&#039;s not always the case. For instance if we were comparing a 4 ohm driver to an 8 ohm driver, and the 4 ohm driver is using an aluminum coil and the 8 ohm driver is using a copper coil, the 8 ohm driver could actually be less efficient, if the Mms is low enough on the 4 ohm driver (remember, the two factors in Efficiency are BL and Mms). Now obviously if we&#039;re comparing a driver that just offers different impedances, this wouldn&#039;t happen, but it certainly could for many other comparisons.I wouldn&#039;t focus on impedance at all when selecting a driver. Realistically, all you need is a driver which is capable of yielding enough output from your amplifier to provide your needs, so realistically speaking, impedance is not relevant, if that requirement is being met.People focus far too much on having X amount of power available, without bothering to consider whether or not they actually USE that power.I&#039;m willing to bet a large majority of people would be quite surprised at how little power they actually typically send to their front stage.Nothing in npdang&#039;s article is untrue, but some of the conclusions people are making aren&#039;t really justified/correct.</blockquote>

[QUOTE="Warbleed, post: 2959847, member: 549898"] It's a bit of a misnomer to call an 8 ohm driver more efficient than a 4 ohm driver based solely on that information. We can say that's true to an extent if we are holding coil material as a constant, but that's not always the case. For instance if we were comparing a 4 ohm driver to an 8 ohm driver, and the 4 ohm driver is using an aluminum coil and the 8 ohm driver is using a copper coil, the 8 ohm driver could actually be less efficient, if the Mms is low enough on the 4 ohm driver (remember, the two factors in Efficiency are BL and Mms). Now obviously if we're comparing a driver that just offers different impedances, this wouldn't happen, but it certainly could for many other comparisons. I wouldn't focus on impedance at all when selecting a driver. Realistically, all you need is a driver which is capable of yielding enough output from your amplifier to provide your needs, so realistically speaking, impedance is not relevant, if that requirement is being met. People focus far too much on having X amount of power available, without bothering to consider whether or not they actually USE that power. I'm willing to bet a large majority of people would be quite surprised at how little power they actually typically send to their front stage. Nothing in npdang's article is untrue, but some of the conclusions people are making aren't really justified/correct. [/QUOTE]

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