Series Parallel or Parallel Series?

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Series Parallel or Parallel Series?

Postby ValveLust on Mon Dec 23, 2013 4:26 pm

Rewiring a '78 Marshall 4X12 with 16ohm G12M25's that had been set up for stereo and I'm about to put it back to mono.

The question is should I wire series parallel or parallel series?
Difference?
What was OEM?
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Re: Series Parallel or Parallel Series?

Postby OldSchoolDave on Mon Dec 23, 2013 9:42 pm

ValveLust wrote:Difference?


You say poTAYto, I say poTAHto :? . AFAIK, it's just a matter of semantics.

Unless you're going to try to pass the wiring off as original, use a heavier gauge, high quality braided wire (18 should be fine - 16 can get stubborn) and keep it simple (no need to twist them).

This is the method I use:

Image

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Re: Series Parallel or Parallel Series?

Postby Papa Dog on Fri Dec 27, 2013 8:17 pm

I prefer to wire them two in parallel in series with two in parallel.
No matter how it might have been done in the past.
I cannot hear a tonal difference, but there is a good reason for doing it the way I do.
Should one speaker of a pair fail, the other in that pair still works.
The other way you loose both speakers in that pair at the same time.

Since it is more likely for a speaker to fail into "open" rather into "short", the cab is still usable.
The other way the cab goes to 32 ohms (for 16 ohm speakers).
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Re: Series Parallel or Parallel Series?

Postby LD50 on Fri Jan 03, 2014 11:19 am

I am with papadog on this. Two pairs of series speakers in parrallel.

I wire as OEM with two parallel twisted runs down the inside of the speakers to the jack. If you blow a speaker you do not go open circuit and trash your nice vintage original OT (always a horrible feeling :cry: )

There was a diagram somewhere (Aitken amps) where you an use both with a switch to do your own blind testing.
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Re: Series Parallel or Parallel Series?

Postby Papa Dog on Fri Jan 03, 2014 6:16 pm

the JCM 800 cabs have a 4 ohm/16 ohm switch. nothing more than series/parallel switch.
for it to work there have to be 2 pair of speakers. each pair must be wired in parallel and the pairs attached to the switch. the switch just changes to either series those pairs or to run them in parallel.

have no pic to post but here it is in notation:
speakers: A B C D all speakers 16 ohm
A parallel B = AB = 8 ohm
C parallel D =CD = 8 ohm
16 ohm = AB series CD
4 ohm = AB parallel CD
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Of cabbages--and kings--"
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