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Post subject: 4 Ohm Cab
Posted: Thu Oct 03, 2013 3:13 am
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Recently acquired a Mustang V; I had a Mustang III but it had the fizz issue and took it back to Guitar Center, and they had a used Mustang V so I upgraded! Brought it home to see on the back of the speaker output jacks it says 8 Ohm minimum. My cab is a 1979 Peavey 412F (300watt, says 4 Ohm Impedance on the back). I've gotten conflicting answers from the research I've done via google on whether running an 8ohm solid state head into a 4ohm cab would hurt the amp. Does anyone have a definitive answer? I've hooked it up and it works, but I didn't crank it in fear of burning the amp up.


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Post subject: Re: 4 Ohm Cab
Posted: Thu Oct 03, 2013 4:10 am
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Hi,
I can tell you how it works in the field of high-fidelity:
if the amplifier has a certain more power (not the twice) that the nominal power of the speakers the match is good... the clean power (undistorted power) is never enough.. within acceptable limits. But it seems that there is a higher tolerance than you might think.
If on the contrary the amplifier has less power than the nominal power of speakers (considering the same load impedance) then there is the risk to burning the amplifier to higher volumes because the current required by the speakers would be greater than that which the amplifier is able to deliver.
Also if the amplifier requires a minimum load impedance of 8 ohm maybe it could "protest" if it is connected to a load with lower impedance (eg. 4 ohms or less).

Perhaps for instruments amplifiers works in a different way though because they are more tough ampli and speaker ... i don't know.

your cab is given for 300 W, we must consider that the cab Mustang is given for only 200 w max (4 ohm) .. and the Mustang head can delivers 150w in total... (minimum a load of 8 ohm)
before to know that for sure i wouldn't risk if i were i you.

I'm sorry that I can not help you further

Dimitri


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Post subject: Re: 4 Ohm Cab
Posted: Fri Oct 04, 2013 9:14 am
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In brief: at low volume you'll get away with it. If you crank it up you will break your amp.

Also, don't forget the Mustang V needs two separate speakers / cabs, one for each channel (left/right). The Mustang V's own 4x12 cab is actually two separate 2x12 rigs in the same cabinet.


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Post subject: Re: 4 Ohm Cab
Posted: Sun Oct 06, 2013 5:31 pm
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scott-uk wrote:
In brief: at low volume you'll get away with it. If you crank it up you will break your amp.

Also, don't forget the Mustang V needs two separate speakers / cabs, one for each channel (left/right). The Mustang V's own 4x12 cab is actually two separate 2x12 rigs in the same cabinet.


On advice of this forum, I got rid of the Peavey 412F 300watt 4 ohm monster and traded my Squier Jazzmaster (*single tear*) for a Bugera 412H-BK. Now I can finally use my Mustang V head! The head has stereo inputs @ 8 ohm, so that's a plus. Thanks for your help, guys.


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