Ever heard about the Series/Parallel vs. Parallel/Series thing. That is where you wire your 4x12 cab in Series/Parallel or Parallel/Series. They say the resulting difference in inductance makes a difference in tone because of how the cab interacts with the tube power section of the amp. Well tonight I tried it with the KPA, I was running two 8 ohm 112 cabs and I tried wiring them in parallel for 4 ohms and I tried wiring them in series for 16 ohm and sure enough there was a noticeable difference, the 4 ohm configuration sounded better, it was a lot tighter (for lack of a better word). Now I'm sure there are a lot of variables at play, like how accurate the output transformer is at each impedance setting, but the point is, it made a noticeable difference in the resulting profile. So, if you haven't tried Series/Parallel vs. Parallel/Series you might want to try it to see how it affects your profiles.
Series/Parallel vs. Parallel/Series
- timowens
- Closed
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Unless you were mismatching ohms, it shouldn't make a bit of difference which impedance the cab is in on how the amp is working.
There's some talk that the speakers themselves will sound slightly different because of how they interact with each other in series vs. parallel though.
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Here are a couple of thoughts...
The inductance is half when the speakers are in parallel and twice in series (just like resistance).
At 4 ohms you are using less windings on the output transformer and at 16 ohms you are using more.I don't know to what degree this should affect the tone or if would affect it at all. But there is a difference in the profiles.
I remember in my days of tweaking point to point marshalls, putting the negative feedback on either the 4,8,16 ohm tap gave a different character.