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<blockquote data-quote="MiniVanMan" data-source="post: 2934082" data-attributes="member: 573252">Take an example like the RS180.&nbsp; It comes in both a 4 ohm and an 8 ohm version.Take an amp that does say 100 watts at 4 ohms, and 50 watts at 8 ohms.Take both drivers and run them subsequently on the same amp.&nbsp; Both drivers will have relatively the same output.Now take the 8 ohm driver and put it on an amp that does 100 watts at 8 ohms and you will have a 3 db gain over the 4 ohm.In order to raise the impedance you need to lengthen the wire wound around the coil.&nbsp; To go from 4 ohm to 8 ohm you need to double it.&nbsp; That causes an increase in inductance (double).&nbsp; Given the same magnet strength, you just doubled your BL.&nbsp; That will equate to an increase of 3 db sensitivity.&nbsp; Higher impedance, higher sensitivity.&nbsp; That means more output with less power.&nbsp; Much more efficient.Now a real benefit, is when you go from 4 ohm to 8 ohm, the power will not be half.&nbsp; To say so, would be saying that you have an amp that has 100% efficiency as the load drops.Stop thinking in terms of impedance, but rather sensitivity.</blockquote>

[QUOTE="MiniVanMan, post: 2934082, member: 573252"] Take an example like the RS180. It comes in both a 4 ohm and an 8 ohm version. Take an amp that does say 100 watts at 4 ohms, and 50 watts at 8 ohms. Take both drivers and run them subsequently on the same amp. Both drivers will have relatively the same output. Now take the 8 ohm driver and put it on an amp that does 100 watts at 8 ohms and you will have a 3 db gain over the 4 ohm. In order to raise the impedance you need to lengthen the wire wound around the coil. To go from 4 ohm to 8 ohm you need to double it. That causes an increase in inductance (double). Given the same magnet strength, you just doubled your BL. That will equate to an increase of 3 db sensitivity. Higher impedance, higher sensitivity. That means more output with less power. Much more efficient. Now a real benefit, is when you go from 4 ohm to 8 ohm, the power will not be half. To say so, would be saying that you have an amp that has 100% efficiency as the load drops. Stop thinking in terms of impedance, but rather sensitivity. [/QUOTE]

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