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More Stereo Speaker Wiring
Diagrams for 2speaker and 4speaker guitar & bass cabinets (2x10,
2x12, 4x10, 4x12, etc.) [For
more information on series, parallel, ohms  or for standard speaker
wiring diagrams, please go here. For stereo speaker wiring
diagrams using only two inputs, please go here.] 

Ok, here are stereo (dual mono) speaker wiring diagrams that utilize
three inputs; two stereo switching jacks and one mono jack.
The big difference between these configurations and
my others is
that you could put two (or four) different speakers in a cabinet and
choose between either side/set (in addition to of course being able to
use all 2/4 in a circuit).There are two main reasons for having this
kind of stereo guitar cabinet:
1. Simply to have a true stereo cabinet for use with a true stereo amp
(duh). Or, for simultaneous use with two different amps.
2. To load it with two different speakers and then be able to
choose between them in addition to being able to use their combined
sound.
I have used two different speakers in a cabinet and it can definitely
be useful, but i do not recommend mixing and matching!
Also, as with any guitar or bass cabinet that is wired for stereo use,
you have to be extremely careful when hooking this kind of
speaker cabinet up to any tube amplifier.
This 3input setup is like the Mesa cabinet (that people have been
emailing me about) in that you have these choices:
1. Either one or both of the "stereo" inputs
or
2. The jack combining all speakers in the cabinet
Depending on how the cabinet is wired, if
you use the 3rd (combining) jack AND one or both of the dual mono jacks,
you could be powering on your amp without a proper load, or shorting the
connection. Bad bad bad.
Anybody who wires their guitar cabinet like this should make sure and
do a very good job of labeling the input jacks so there is no confusion
when you're going from a studio gig to a poorlylit bar!
Ok i'm done preachin. Like my other speaker wiring diagrams,
i'm breaking these up by 2speaker and then 4speaker cabinets, starting
with the most simple diagrams. If you have any questions, for
God's sake, please don't ask! hehe 

Ok, first up would be a twospeaker
cabinet loaded with 4ohm speakers. Your options are: dual
singles @ 4ohms each, or combined in series @ 8ohm
total load.


Plugging into either
Input A or Input B would give you that speaker.
When either of these two (A&B) inputs are used, they are not
connected, which means you could use two different amps, or a
true stereo amp (Line6), or just both outputs from a mono amp
(Marshall, Fender, Egnater).
Plugging into Input C will give you both speakers combined in
series.
And again: If you're plugged into Input
C, you cannot also be plugged into either A or B and have
this work!
1. A @ 4 ohms
2. B @ 4 ohms
3. A + B (4 ohms each)
4. C (but not A or B!) @ 8 ohms
total load 



Ok here we have
another twospeaker stereo cabinet; this time loaded with 8ohm
speakers. Your options are: dual singles @ 8ohms each, or
combined in series @ 16ohm total load.

Obviously the only difference between this wiring diagram and
the one above is the use of 8ohm speakers.
Input A or B will give you that speaker @ 8
ohms. Using both A & B is fine; it's 8 ohms each.
Input C combines the two speakers in
series giving us a 16ohm total load. 




Next up is
another 2speaker cabinet loaded with 8ohm drivers. This
time the options are: dual singles @ 8ohms each, or combined in
parallel @ 4ohm total load.


Input A = 8 ohms
Input B = 8 ohms
Input C = 4 ohmsLike the others,
you could use either A or B or both A&B. And then of
course Input C must be used by itself.
This speaker wiring diagram gets a
little more interesting because now we've got two wires
connecting the stereo switching jacks.
And here you can see that, again, plugging into either of these
(A/B) jacks will break the connections to the other (A/B) jack.
I have the mono jack connected directly
to the speaker posts because that's the way i'd do it (heavy
wire). Obviously you could connect it right to Input B's
jack and it'd be the same thing there. 



And finally
here's the only 2speaker cabinet that uses 16ohm drivers.
Your options are: dual singles @ 16ohms each, or combined in
parallel @ 8ohm total load.

Man i'm only halfway through with these and i'm already
completely bored. Ok this is the
same wiring diagram as above but with 16ohm speakers of course.
Inputs A & B are 16 ohms each.
Input C combines both speakers in parallel, which gives us an
8ohm total load.
You want to use this cabinet in stereo;
use Inputs A&B. Mono with both speakers; use Input C. 




And here we go
with the 4speaker cabinet diagrams. This cabinet has
8ohm drivers, so your options are: dual 2speaker parallel
circuits @ 4 ohms total load each, or all four speakers combined
in parallel/series @ 8ohm total load.
Yes, this is just like that very first
2speaker single/series diagram. The obvious difference
with this configuration is the addition of two more speakers
wired in parallel to the first two.
Using either Input A or B will give you
those two speakers wired in parallel at 4ohm total load each.
Using Input C takes both those parallel sets and combines them
in series like this:
* 8 ohms + 8 ohms combined in parallel = 4 ohms
* 4 ohms + 4 ohms combined in series = 8 ohms






Our second 4speaker
stereo cabinet is the same as the first but with 16ohm drivers.
Options are: dual 2speaker parallel circuits @ 8 ohms total
load each, or all four speakers combined in parallel/series @
16ohm total load. Looking at that
green wire it's easy to see how the positive from one 2speaker
(parallel) circuit is connected to the negative of the other
2speaker circuit, thus allowing to combine them in series
(the mono jack hits the positive of one set and the negative
of the other).
A = two speakers in parallel @ 8 ohm
total load
B = two speakers in parallel @ 8 ohm total load
C = takes two 8ohm parallel circuits and combines them in
series @ 16 ohm total load
Simple enough; yea? 




Here's a 4speaker cabinet
loaded with 4ohm drivers but going series series/parallel.
Options are: dual 2speaker series circuits @ 8 ohms total load
each, or all four speakers combined in series/parallel @ 4ohm
total load. Input A = 2 4ohm
speakers in series @ 8 ohms total load
Input B = 2 4ohm speakers in series @ 8 ohms total load
Input C = 4 4ohm speakers combined in series/parallel @ 4 ohms
total load
This speaker wiring diagram just looks
hilarious. You have the two 2speaker circuits being
connected in series and then to combine these circuits in
parallel i have all this soldering at the switching
jacks.
Obviously you could connect the positive and negative from the
mono jack to posi and negi at one of the speaker sets. I
didn't even think about this til after i was done "photoshopping"
and i'm just too lazy to go back and fix it.





Finally; the last stereo
speaker wiring diagram! Same as above (series
series/parallel) but this cabinet would have four 8ohm
speakers. Options are: dual 2speaker series circuits @ 16
ohms total load each, or all four speakers combined in
series/parallel @ 8ohm total load.
I had a friend of mine proofread all these
diagrams and he bitched about these specifically, asking "why
don't you use two more colors for the switch conns?" And
the thing is, i would've, but it's a helluva lot easier to trace
this circuit when everything is correctly colorcoded (it's just
a pain in the ass to look at). But hey, at least i used
drop shadows, right?
:I





I'm also posting two blank speaker wiring
diagrams so that anybody who wants to prove that my diagrams are
very very crappy can go ahead and make better ones (and email
them to me). :) 





is anybody every gonna go
this far down such a long page? this ad will NEVER get clicked on!
:(

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