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<blockquote data-quote="helotaxi" data-source="post: 2963109" data-attributes="member: 550915">There&#039;s a whole lot more to it than any of these generalizations take into account.You can&#039;t categorically say that lower impedance drivers are less efficient.&nbsp; In the example of the ID Chameloens they have the same efficiency measured at 1W*m (rather than 2.83V*1m as most speakers are rated.).Secondly. Take the equation and look at the relationship between the different variables.&nbsp; There is an exponentional relation between the length of wire in the gap and the resisitance of that wire.&nbsp; If you double the length of wire, you will double the resistance but increase the BL product by 4x.&nbsp; Since you don&#039;t also double the Mms (there&#039;s way more than the coil involved in the moving mass) you will get an increase in driver efficiency.Third, you can&#039;t make a simple half the wire double the wire comparison and get a valid result.&nbsp; If you did that, the 8 ohm dirver would flat walk all over the 4 ohm version.&nbsp; The 4 ohm version would see more current for a given wattage with less wire in the coil to shed the heat.&nbsp; It would therefore have lower thermal power handling and be less efficient.There has to be a change in the diameter of the coil wire in addition to the length to keep power handling about the same.&nbsp; That makes for an increase in the L portion but an increase in the Mms as well.Samson, real world though your example may have been scientific it wasn&#039;t even close.</blockquote>

[QUOTE="helotaxi, post: 2963109, member: 550915"] There's a whole lot more to it than any of these generalizations take into account. You can't categorically say that lower impedance drivers are less efficient. In the example of the ID Chameloens they have the same efficiency measured at 1W*m (rather than 2.83V*1m as most speakers are rated.). Secondly. Take the equation and look at the relationship between the different variables. There is an exponentional relation between the length of wire in the gap and the resisitance of that wire. If you double the length of wire, you will double the resistance but increase the BL product by 4x. Since you don't also double the Mms (there's way more than the coil involved in the moving mass) you will get an increase in driver efficiency. Third, you can't make a simple half the wire double the wire comparison and get a valid result. If you did that, the 8 ohm dirver would flat walk all over the 4 ohm version. The 4 ohm version would see more current for a given wattage with less wire in the coil to shed the heat. It would therefore have lower thermal power handling and be less efficient. There has to be a change in the diameter of the coil wire in addition to the length to keep power handling about the same. That makes for an increase in the L portion but an increase in the Mms as well. Samson, real world though your example may have been scientific it wasn't even close. [/QUOTE]

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