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Old 02-06-2008, 10:51 AM   #1 (permalink)
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Ohm Question
is it bad if i run my amp at 4Ohms and my cab is 8Ohms?
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Old 02-06-2008, 11:01 AM   #2 (permalink)
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it's not brilliant if it's tubes, tube amp output should always be matched with the cab, if in a pickle the tube amp output can be lower than the cabinet impedance.

Putting a lower impedance cab on a tube amp will cause your output transformer to fry, ie, using a 4ohm cab with the amplifier set to 16 will kill it and present you with a huge repair bill.

However, if we are talking solid state, then the 4ohm on the back of the amp indicates minimum impedance to be attached.

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Old 02-06-2008, 11:08 AM   #3 (permalink)
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its a tube i am looking to buy and its been at samash for awhile and i have no idea it has been like this but i just saw it yesterday and i wanted to check to see if there was any long term damage that i should be worried about
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Old 02-06-2008, 11:40 AM   #4 (permalink)
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Should be OK, I ran a 2:90 at 8ohms into a 16ohm marshall cab for a while and that's ok, it just means your transferring less power to the cab.

Not ideal, but a million times better than the other way around
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Old 02-06-2008, 02:34 PM   #5 (permalink)
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It will be fine. It just won't sound as good as it could. On tube amps it's best not to go too low. If the amp was 8ohm output impedence and the cab was 4ohm, I wouldn't. With the amp at 4ohms and the cab at 8ohms, you won't hurt anything but your tone (slightly).
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