Red Knob Twin Amps

  • Thread starter Thread starter NYMorningstar
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NYMorningstar

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I have two red knob amps. One hasthe original fender speakers wired in series and running at sixteen ohms and the other has two different 8 ohm jbl's wired paralell running at 8 ohms. I like the sound of the jbl's better but the amp hums a little. Could the hum be from the impedance selection? Shouldn't it be running at 4 ohms wired this way?
 
If they are wired in parallel, it is a 4 ohm load. If the amp says it needs an 8ohm load, someone just put the wrong impedance speakers in it. Fenders can generally handle a bit of impedance mismatch, so it's probably not that big of a deal.

I don't think the mismatch would cause the hum, though.
 
However, over a period of time a mismatched spkr/amp impedance could weaken the amp... or even smoke it.
 
boingoman said:
If they are wired in parallel, it is a 4 ohm load. If the amp says it needs an 8ohm load, someone just put the wrong impedance speakers in it. Fenders can generally handle a bit of impedance mismatch, so it's probably not that big of a deal.

I don't think the mismatch would cause the hum, though.
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two 8ohm speakers wired in parallel should be 4 ohms [1/(1/8ohms+1/8ohms)=4ohms]
maybe the drivers have been replaced with incorrect ones
 
Actually the amp has 3 options to set the ohms, 4, 8 & 16. It's been running on 8 ohms and I thought it should be on 4 ohms because it is wired paralell. It' appears when they switrched to jbl's they changed the wiring to paralell instead of in series. Is there any advantage to that or should I change it back to be wired in series? Someone told me the only advantage is when you wire in series and one speaker goes it kills all the sound where as in paralell you still have the other speaker working. Is there any other advantage?
 
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