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post #61 of 66 Old 11-28-2012, 11:26 AM
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What, if any, is the advantage of using 4 ohm system over 8 ohm system?
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post #62 of 66 Old 11-28-2012, 02:25 PM
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4 ohm speakers tend to be more sensitive than 8 ohms. My center is rated as 86db sensitivity and is 8 ohms and my R/Ls are 4 ohms and rated at 89db sensitivity. They are otherwise the same. Its not that I favor 4 ohms in and of itself, its just the speaker that has the performance I prefer happens to be 4 ohms.
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post #63 of 66 Old 11-28-2012, 03:52 PM
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In that regard, higher sensitivity means less power to reach higher volumes. So the advantage with less resistance is a lower electricity bill. Correct?
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post #64 of 66 Old 11-28-2012, 03:56 PM
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post #65 of 66 Old 11-28-2012, 04:36 PM
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Leaving aside design considerations of specific drivers that the designer believes are superior the advantage of a 4 ohm speaker is that if you audition it next to an 8 ohm speaier without adjusting the volume control the 4 ohm speaker may be just a notch louder. Not so much that you necessarily identify it as louder, but you'll hear more detail because of the potential 3 dB SPL difference, so you can sell the 4 ohm ones easier.

most of us aren't using much more than a watt for average SPL, with occasional peaks calling for significantly more (a 20 dB peak would need 100 watts) but since the bulk of the listening is at low power the difference in power input needed to service say 1 or 2 watts on average versus 2 or 4 watts on average is pretty mych meaningless.
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post #66 of 66 Old 11-28-2012, 05:00 PM
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Quote:
Originally Posted by J Real View Post

What, if any, is the advantage of using 4 ohm system over 8 ohm system?

There are so many different examples to consider that global conclusions are hard to make.

It is true that all other things being equal a 4 ohm driver will accept more power from a given SS power amp than an 8 ohm driver. The problem: finding all other things being equal! ;-)

There seems to have been a shift towards lower impedance drivers and speaker systems over the past 40 years, probably due to the shift from tubed amps with output transformers that matched impedances to SS amps that are transformerless and don't match impedance but deliver more power to low impedance loads.
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