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2 omhs or 4 omhs

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Old Apr 20, 2010 | 11:25 PM
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Default 2 omhs or 4 omhs

I have and old school Rockford fosgate 75 amp. Which one will sound better in a stealth box. The 2 or 4 ohm spearker.

Last edited by 98z8uup; Apr 21, 2010 at 07:30 AM.
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Old Apr 20, 2010 | 11:45 PM
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Need more information on the amp.
If it's a 1 channel amp, the 2 ohm speaker will be better.
If it's a 2 channel amp, the 4 ohm speaker bridged
will be better. Either way 75 watts is pretty low.
(By speaker I assume you mean subwoofer)

Last edited by OSU Football Fan; Apr 20, 2010 at 11:56 PM.
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Old Apr 21, 2010 | 01:10 AM
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Yes it's a 2 channel amp. Also all of RF old amps where underrated. If you know thier old stuff you know this is a real strong amp for it size.
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Old Apr 21, 2010 | 07:24 AM
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The impedance of a speaker has absolutely nothing to do with sound quality. Asking if a 2-ohm speaker will sound better than a 4-ohm is like asking if a blue car will be faster than a red car.

The impedance has a big impact on power output. Assuming that the amp can handle it, a lower impedance speaker will flow more current and produce more output power. If the amp is 2-ohm stable, it will produce about twice as much power into a 2-ohm speaker as it will with a 4-ohm speaker (if the amp isn't 2-ohm stable it will just go up in a puff of smoke if you do that). Twice as much power does not produce twice as much volume - it will produce 3dB more volume which is noticeable but not hugely significant. You need ten times the power to double the volume.

So to answer your question... neither will sound better (sound quality) but the 2-ohm will be somewhat louder as long as the amp can handle it.
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Old Apr 21, 2010 | 07:29 AM
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Thanks Whitebird00. It is a 4 ohm amp.

Last edited by 98z8uup; Apr 21, 2010 at 07:35 AM.
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Old Apr 21, 2010 | 03:41 PM
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Originally Posted by WhiteBird00
The impedance of a speaker has absolutely nothing to do with sound quality. Asking if a 2-ohm speaker will sound better than a 4-ohm is like asking if a blue car will be faster than a red car.

The impedance has a big impact on power output. Assuming that the amp can handle it, a lower impedance speaker will flow more current and produce more output power. If the amp is 2-ohm stable, it will produce about twice as much power into a 2-ohm speaker as it will with a 4-ohm speaker (if the amp isn't 2-ohm stable it will just go up in a puff of smoke if you do that). Twice as much power does not produce twice as much volume - it will produce 3dB more volume which is noticeable but not hugely significant. You need ten times the power to double the volume.

So to answer your question... neither will sound better (sound quality) but the 2-ohm will be somewhat louder as long as the amp can handle it.
I love your thorough answering of questions. Very nice.
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