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Is it true what polk and infinity say
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<blockquote data-quote="n2audio" data-source="post: 8328689" data-attributes="member: 540940"><p>I don't like the idea of a 2 ohm speaker on a head unit even though JBL/Infinity etc say it's ok.</p><p></p><p>The fact of the matter is a HU's internal amp is already at its limit driving a 4 ohm speaker.</p><p></p><p>If you've ever felt the face (or even worse, the back - heat sink area) of a head unit that's powering 4 speakers directly it gets VERY hot.</p><p></p><p>If the resting resistance of a speaker is less than the typical 4 ohm speaker it's not exactly a stretch to assume its operating impedance is lower as well.</p><p></p><p>Lower impedance means more current demand. More current demand means even more stress on an already over-worked internal amp.</p><p></p><p>Since the amp is not able to produce more power (already being at its limit) with the reduced impedance there is no chance for louder speaker performance.</p><p></p><p>I think the selling point for these speakers is that they get more power out of an EXTERNAL amp, but in an effort not to turn away a possible sale to someone using head unit power, naturally, they're going to tell you they are perfectly compatible with a head unit.</p></blockquote><p></p>
[QUOTE="n2audio, post: 8328689, member: 540940"] I don't like the idea of a 2 ohm speaker on a head unit even though JBL/Infinity etc say it's ok. The fact of the matter is a HU's internal amp is already at its limit driving a 4 ohm speaker. If you've ever felt the face (or even worse, the back - heat sink area) of a head unit that's powering 4 speakers directly it gets VERY hot. If the resting resistance of a speaker is less than the typical 4 ohm speaker it's not exactly a stretch to assume its operating impedance is lower as well. Lower impedance means more current demand. More current demand means even more stress on an already over-worked internal amp. Since the amp is not able to produce more power (already being at its limit) with the reduced impedance there is no chance for louder speaker performance. I think the selling point for these speakers is that they get more power out of an EXTERNAL amp, but in an effort not to turn away a possible sale to someone using head unit power, naturally, they're going to tell you they are perfectly compatible with a head unit. [/QUOTE]
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