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Dirty-South Blues Harp forum: wail on! >
Ohm's and Speakers
Ohm's and Speakers
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Pockets
29 posts
Feb 28, 2013
8:42 AM
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I did not want to hijack a current thread... so i thought i would start another one, to ask my question:
Firstly, is there a typical (or standard) ohm wiring for speaker cabs..... or are they all different (by manufacturer make)?
Secondly, is it difficult/a common request (commonly done by local shops) to change a cabinet from lets say 8 ohms to 4 ohms?
ex. Lets say i have a 16 ohm cabinet... but i want it changed to run off at 4 ohm line out from a 5w amp that i have.
thanks... i'm kinda a noob to this subject (I have combo amps currently)
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5F6H
1566 posts
Feb 28, 2013
8:58 AM
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Speaker impdeance is nominal and changes upwards with frequency, at 3.5kHz most speakers/cabs are twice their rated impedance, so it is normal for a 4ohm speaker to be more than that in everyday use.
There is no hard & fast rule because differing manufacturers use differing primary impedances (that the tubes see) in broadly similar amps.
So I'd say 8ohms on a 4ohm tap will be safe...more than that is a judgement call...I suspect that it would be relatively safe to run 16ohms on a 4ohm tap, but any info on the amp in question might be helpful?
How many speakers in the 16ohm cab? If 4@16ohms each, it can be wired for 16ohms or 4ohms.
Do not mismatch down (say 4ohms on a 8ohm/16ohm tap) without confirmation that this is safe with respect to your particular amp. If in doubt play safe & stick to manufacturer's recommended load.
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Last Edited by 5F6H on Feb 28, 2013 8:59 AM
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timeistight
1141 posts
Feb 28, 2013
9:48 AM
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"Firstly, is there a typical (or standard) ohm wiring for speaker cabs..... or are they all different (by manufacturer make)?"
I'd say 4 and 8 ohm are the most typical, followed by 16 ohm, with 2 ohm being the least typical.
"Secondly, is it difficult/a common request (commonly done by local shops) to change a cabinet from lets say 8 ohms to 4 ohms?"
It all depends on the speakers in the cab. Once you have speakers, all you can do is wire them in series or parallel, or, if you have three or more, in a combination of series and parallel.
"ex. Lets say i have a 16 ohm cabinet... but i want it changed to run off at 4 ohm line out from a 5w amp that i have."
It depends. If your 16 ohm cabinet has two 8 ohm speakers in series, its easy to rewire them in parallel and get 4 ohms. However, if the cabinet has only one 16 ohm speaker, you'd have to replace the speaker to get a 4 ohm cabinet.
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Playing music... it's a privilege.
Kim Wilson
Last Edited by timeistight on Feb 28, 2013 9:49 AM
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