| CG_25 |
Alright, I plan to make a 4x12 guitar cabinet. Before I start I want to lay out all my plans. What I need to know is how to wire the cabinet so i have: a mono (8 ohm) input, individual left and right inputs (at 4ohms each) and an output.
To get a better Idea of what I want, look at this MESA jackplate.
[IMG]I want to have the same wiring as this cabinet does. Does anyone know how I should go about doing this properly?[/IMG] |
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| CG_25 |
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| CG_25 |
| Wow, thanks, just what i was looknig for. I plan to use this |
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| Artie |
Hey CG; One caution. If I'm reading that diagram correctly, and if you use grounded jacks, and if use a metal mounting plate . . . you'll have a dead short from hot to ground.
Let me study it some more, but I wanted to warn you before you fire anything up. Literally. :D |
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| Artie |
Note the path I've highlighted in green. If those two jacks share a chassis ground, it could be a problem.
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| sreten |
Hi,
that green path is a problem. The diagram is not correct.
What you need to do is assume that they are switching jacks.
That is each jack has four connections, with no plug inserted + joins +,
- joins -, with a plug inserted only the input + and - connect to the lead.
So you do not wire it as a normal parallel/series 4x12 for the 8ohm
jack, as shown. The daisy chaining output socket is fairly obvious.
The two 4 ohm jacks are wired into each series leg, and with no plugs
inserted they provide the series connection represented by the green
cross connection. This path should be broken by either 4 ohm plug.
Make sure you get all your phasing correct.
The switched tip of one 4 ohm socket connects to the switched ring of the other.
The other two switched connections remove the connection to the 8 ohm socket.
:)/sreten.
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| CG_25 |
| I'm starting to understand, but Im still confused |
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| CG_25 |
| Thanks for the help, are you sure it won't work? I'm not really understanding what you're trying to tell me. Do you think you could draw up a simple diagram for me to follow!:confused: |
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| CG_25 |
| Will this work. This is how im understanding what you told me! |
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| CG_25 |
| opps... this is my diagram... |
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| CG_25 |
| Alright, this time it should work... Here is what I enterpreted what you told me as. Can anyone confirm if this is correct? |
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| sreten |
Hi,
nearly there except your 8 ohm input is 4ohms and one side.
Consider :
sockets are labelled :
AB EF IJ
CD GH KL
The last socket is turned upside down so :
B and D are switched, not connected with plug inserted.
F and H are switched, not used, could be a different type of socket.
I and K are switched, not connected with plug inserted.
A= left pair + (tip)
C= left pair -
J= right pair + (tip)
L= right pair -
B and E are connected together.
D and I are connected together.
G and K are connected together.
Plug in 8 ohm gives both sides in series and in phase and same
phase as 4 ohm. Plug into either 4 ohm disconnects 8 ohm.
Its not all common ground, but is amplifier safer if leads are wired wrong.
:)/sreten.
Due to multiple cabinets always make sure absolute phasing is
correct. Tip is always positive. + voltage on tip = driver forward.
A battery connected to a jack plug make this test easy.
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| CG_25 |
| Very confusing. Ill see if i can enterpret that. Could you possibley draw it up for me? |
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| CG_25 |
Im going to assume:
edited out... |
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| CG_25 |
disregard that last post, i think i understand know.
So basically this wiring will give me 4 ohms left and 4 ohms right. OR 8 ohms combined? Is this correct? |
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| sreten |
| quote: | Originally posted by CG_25
disregard that last post, i think i understand know.
So basically this wiring will give me 4 ohms left and 4 ohms right. OR 8 ohms combined? Is this correct? |
Hi,
Yes. 4 ohms per channel as a stereo cabinet. 8 ohms as a mono 4x12.
:)/sreten. |
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| sreten |
| quote: | Originally posted by CG_25
Is this correct? |
Yes. :)/sreten. |
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| CG_25 |
| Where could I pick up some of those switch-jacks. Would the source or best buy carry them? How much do they go for. |
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| CG_25 |
| So does ANYONE know where I can buy switchjacks, locally without shipping it. I know mojo musical has a few. I'm not sure which one too buy though? |
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| Trout |
| quote: | Originally posted by CG_25
So does ANYONE know where I can buy switchjacks, locally without shipping it. I know mojo musical has a few. I'm not sure which one too buy though? |
Best bet is to use the standard Cliff style Jacks, Lots of sources around.
AES has them Part Number S H502
http://www.tubesandmore.com/
Parts Express sells another brand of basically the same thing made by Rean?
Any place that sells or services Marshall amps should be a good source locally. The Cliff jacks are pretty much a standard. |
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| CG_25 |
| quote: | | Any place that sells or services Marshall amps should be a good source locally. The Cliff jacks are pretty much a standard |
Does anyone know what type of marshall cabinets actually use this type of jack? this is EXTREMELY important for me to find out!! |
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