Stereo/Mono 4x12" Marshall cabinet wiring - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 3rd January 2008, 07:40 PM   #1
diyAudio Member
 
Join Date: Jan 2008
Default Stereo/Mono 4x12" Marshall cabinet wiring

Hello,

I have a question concerning an old Marshall 4x12" cabinet I just purchased. It is an 8 Ohm mono cabinet originally. However, he had rewired it as a Stereo cabinet. Each pair is wired in Series (2 x 8 Ohm) left & Right.

Click the image to open in full size.

However, I would like to add the following stereo/mono jack plate to it so that I can occasionally run the cabinet in 8 Ohm mono without having to rewiring it back permanently.

Click the image to open in full size.
Click the image to open in full size.

So can anyone please tell me if I have to following any special wiring instruction? Or, is it just simply connecting the left pair of speakers to the left input (+/-) and do the same for the right side.

Any help you can provide...it would be great!

Thanks

Tony
  Reply With Quote
Old 4th January 2008, 09:06 AM   #2
diyAudio Member
 
Andronico's Avatar
 
Join Date: Jun 2004
Location: Santos Lugares
Yes, you have to connect the left pair of speakers to the left input (+/-) and do the same for the right side. When you plug the left input two channels are connected in parallel (16 ohms in parallel = 8 ohms mono) but if you connect the two inputs (left and right) the right plug opens the connection and the two channels are independent (stereo 16 ohms each).
Hope that helps
  Reply With Quote
Old 4th January 2008, 04:49 PM   #3
diyAudio Member
 
Join Date: Jan 2008


Thanks for your reply. I guess the plate have some double wiring in it so that it does not require a selectable stereo/mono
DPDT type switch?

Tony
  Reply With Quote
Old 4th January 2008, 05:34 PM   #4
diyAudio Member
 
Andronico's Avatar
 
Join Date: Jun 2004
Location: Santos Lugares
Hi Tony, you don´t need a DPDT switch. Look at the plate and connectors carefully. These connectors has two rows of pins, one row connects to the other one if the plug is not inserted. You can see this function in more detail if you insert a plug in the connector. When you connect only the left input the wires of the left channel are connected in parallel with the wires of the right channel (using the two unshilded wires that you can see in the reverse of the plate) and you have a 8 ohms mono cab. But when you connect the right input, the plug disconnects the connection between both channels and the connection is in 16 ohms stereo mode automatically. If you have any doubt, you can check using a multimeter. If you have any questions, please ask !

  Reply With Quote
Old 4th January 2008, 10:37 PM   #5
diyAudio Member
 
Join Date: Jan 2008
Thank-you for your help, Andronico
I will pick myself up one of these mono/stereo jack plate.

Cheers!

Tony
  Reply With Quote
Old 5th January 2008, 09:17 AM   #6
diyAudio Member
 
Andronico's Avatar
 
Join Date: Jun 2004
Location: Santos Lugares
You´re are welcome.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Mono to stereo input wiring question Keskin Class D 8 1st March 2009 11:33 AM
Marshall 4X12" Cabinet Plans anyone?? Zero Cool Instruments and Amps 3 27th November 2007 02:00 AM
Marshall 4x12 cab tareqx2 Instruments and Amps 22 18th September 2007 10:47 AM
stereo/mono WIRING CG_25 Instruments and Amps 23 13th August 2007 08:09 PM
Stereo/mono wiring kinundrum Krnichin Multi-Way 12 25th May 2006 09:44 AM


New To Site? Need Help?

All times are GMT. The time now is 04:38 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2