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Speaker Cab For A Marshall Plexi - 4, 8, or 16 Ohm?

dmentzer

Silver Supporting Member
Messages
303
Since a Marshall Plexi, or any Marshall in fact, can run a cab with 4, 8, or 16 ohm impedence, which is probably the most efficient to use? I remember reading somewhere that if you run it at 16 ohm, you are using the full winding of the PT. Is there any truth to that or is it bunk?
 

GearHeadFred

Member
Messages
1,643
It's true that you use all the windings in the 16 ohm position.
Whether that makes a difference in tone.... well, that's a whole 'nother story!!
 
Messages
6,663
Most Marshalls can be run at different impedances. Personally I think the tone difference is negligable to slight.
 

pdf64

Member
Messages
8,253
I doubt that there will be much difference in efficiency.
Whereas some difference in the tonal response may be evident.
Tube amps have significant output impedance, which will interact with the cab impedance to act as a potential divider on the amp output.
Cab impedance varies enormously with frequency. With the speakers in the cab wired in parallel, that variation will tend to be less than if they are wired in series (slight dis-similarities between the speakers will exacerbate this).
Series/parallel (the regular 4x12 arrangement) is more akin to series in that regard.
Pete
 




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