Can I Safely Run These Simultaneously???

Robert Herndon said:
Stereo jacks measure 8 ohms each. Mono's measure 4 ohms each.
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Robert I need to ask ?
does your Origin have the sticker on the back at the speaker outs that means it was corrected, because mine have not been fixed yet and only one of each works, either the 16 ohm or one of the 8 ohm jacks.
It is only a one wire fix MD on the MF posted a pic of the fix , in the official origin 50 thread about a year and a half ago.
Cheers
Mitch
 
Jethro Rocker said:
Yep. Not a lot of safe options.
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Agreed! My Marshall 4x12 is so much better with my small amps than my Mesa Recto 4x12...but my 8Ohm 2x12 loves all of my amps. I often wish for the ability to use my 2x12 with my Marshall 4x12, but it is not going to happen. I may build a 16Ohm 2x12, or just get a matching 4x12, in the near future...but I am not gigging or anything anymore (COVID) so.....
 
Clockworkmike said:
Very cool! And its awesome you saw Eric Johnson: man is a wizard. Thanks for clarifying this a bit too!
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Here’s the post I made at the time with pics of his rig:

Just Scored Eric Johnson Tickets!

I have never heard of Eric Johnson.. I forgive you, You've been shovelling a lot of snow since the '80s,,,(well...maybe not so much because there has been lot of CO2 pumped into the air since the 1890s)... ...So...we essentially "F'ed" ourselves and our kids....but..no matter! Party on...
www.thetonerooms.com
 
Mitch Pearrow SJMP said:
Robert I need to ask ?
does your Origin have the sticker on the back at the speaker outs that means it was corrected, because mine have not been fixed yet and only one of each works, either the 16 ohm or one of the 8 ohm jacks.
It is only a one wire fix MD on the MF posted a pic of the fix , in the official origin 50 thread about a year and a half ago.
Cheers
Mitch
Click to expand...

Yep...its got the sticker...

20201025_184534.jpg
 
I guess I need to go ahead and put wheels back on the Jackson 4x12 cabinet. I had removed them so it would fit under a table in my studio. I probably should add it to the band trailer's load out and start using it live for all these outdoor events....
 
I can't believe how some people threat musical equipment. I've been letting our bandleader borrow one of my spare DSL40c's since November and it looks like a pawn shop find. SMH!!!!

My stuff get used daily and always looks new, even after YEARS of use!!!!!
 
Robert Herndon said:
I also performed an ohm test on the Jackson and it is indeed 4ohms in the inputs marked 'mono' and 8ohms in each of the stereo inputs.
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Robert Herndon said:
I'll have to pay a lot closer attention to things because its easy to hook it up wrong. I was running the 16ohm output into my 8ohm cabinet for a while tonight without realizing it...and playing with the master volume at 7-8 and controlling volume in the FX loop.

Not sure if this Origin is Class A or A/B, but it seems to be a pretty forgiving amp...
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I won't quote smitty, AMS, or Jethro, you guys can see their answers easily enough.
If I understand Robert's scenario right, he has 1- 2x12 cab at 8 or 16 ohms, and a 4x12 that goes 4 and 8 in the stereo or mono settings.

Maybe I can speak of my own experiences and y'all can clarify or clean up anything I say that is not accurate.

Let me start with, I have 0 0 0 ZERO, experience with a 2x and 4 x cab run together. BUT, I do have a particular experience with 2 4x12 Stereo/Mono cabs of different manufacturers. In this case, I have a Marshall 300 Watt G12/ 75 loaded cab that is operated as per these instructions. https://www.marshallamps.de/fileadm...nuals/Marshall-External-Cabinets-Handbuch.pdf
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NOW for where I learned that " guessing" is not a method. To ensure safe operation, one must confirm with a Meter the true output results. So follow me here. My 1960A cab is either 4 ohm Stereo, or 16 ohm Mono. To save from having a mismatch scenario like Robert did, I put BLUE Painter's tape over the 4 OHM Stereo side jack, and put the switch to mono 16 ohm. No possible way to plug a 16 ohm load into a 4 ohm cab setting that way.

Also as many already know, I bought a 100 Watt Marshall head and an 4x12 Behringer Stereo/ mono cab that had 4 new Eminence Governor 16 ohm speakers wired into it. So by all logic, 4- 12 inch 16 ohm speakers wired up, should yield what the cab says it should, 4 or 8 ohms this time.
Since my readings while putting my test meter leads at the end of the speaker cable yielded all manner of screwy readings, like one side reading 50 some ohms, and the other like 2,,,,,,,, I figured I better open the patient up.

To make a long story short, I decided to open up my Marshall Cab to do a side by side. I rigged up some alligator clip wires to move the wiring orientations around and check for results. The tests resulted in the Marshall cab 4 - 16 ohm G12's yielded the 4 ohm and 16 with the Marshall Jack.

Now the 4- 16 Ohm Eminences with Berhringer Jack/ switch plate. Taking the Gator clip test leads and wiring it the same as the 1960A, it yielded the 4 and 8 ohm reading as designed and notated on the jack plate. Asking myself how this could be, I concluded it must be a difference in each maker's jack/switch plate. I confirmed this by switching the jack plates from Eminences to Celestians and seeing the ohms swap specs as expected.
 
chilipeppermaniac said:
I won't quote smitty, AMS, or Jethro, you guys can see their answers easily enough.
If I understand Robert's scenario right, he has 1- 2x12 cab at 8 or 16 ohms, and a 4x12 that goes 4 and 8 in the stereo or mono settings.

Maybe I can speak of my own experiences and y'all can clarify or clean up anything I say that is not accurate.

Let me start with, I have 0 0 0 ZERO, experience with a 2x and 4 x cab run together. BUT, I do have a particular experience with 2 4x12 Stereo/Mono cabs of different manufacturers. In this case, I have a Marshall 300 Watt G12/ 75 loaded cab that is operated as per these instructions. https://www.marshallamps.de/fileadm...nuals/Marshall-External-Cabinets-Handbuch.pdf
-----------------------------------------------------------------------------------------------------------------------------------

NOW for where I learned that " guessing" is not a method. To ensure safe operation, one must confirm with a Meter the true output results. So follow me here. My 1960A cab is either 4 ohm Stereo, or 16 ohm Mono. To save from having a mismatch scenario like Robert did, I put BLUE Painter's tape over the 4 OHM Stereo side jack, and put the switch to mono 16 ohm. No possible way to plug a 16 ohm load into a 4 ohm cab setting that way.

Also as many already know, I bought a 100 Watt Marshall head and an 4x12 Behringer Stereo/ mono cab that had 4 new Eminence Governor 16 ohm speakers wired into it. So by all logic, 4- 12 inch 16 ohm speakers wired up, should yield what the cab says it should, 4 or 8 ohms this time.
Since my readings while putting my test meter leads at the end of the speaker cable yielded all manner of screwy readings, like one side reading 50 some ohms, and the other like 2,,,,,,,, I figured I better open the patient up.

To make a long story short, I decided to open up my Marshall Cab to do a side by side. I rigged up some alligator clip wires to move the wiring orientations around and check for results. The tests resulted in the Marshall cab 4 - 16 ohm G12's yielded the 4 ohm and 16 with the Marshall Jack.

Now the 4- 16 Ohm Eminences with Berhringer Jack/ switch plate. Taking the Gator clip test leads and wiring it the same as the 1960A, it yielded the 4 and 8 ohm reading as designed and notated on the jack plate. Asking myself how this could be, I concluded it must be a difference in each maker's jack/switch plate. I confirmed this by switching the jack plates from Eminences to Celestians and seeing the ohms swap specs as expected.
Click to expand...

I guess my point here also might be as pertaining to Robert's 6 speakers, Maybe a different Switch jack plate will convert his 4 ohm/8 ohm cab into a 4ohm/16 ohm cab and then when it is set at 16 ohm and the other one set at 16 ohm and the cabs are joined together, it will yield essentially a 6x12 with an 8 ohm rating?
 
chilipeppermaniac said:
I guess my point here also might be as pertaining to Robert's 6 speakers, Maybe a different Switch jack plate will convert his 4 ohm/8 ohm cab into a 4ohm/16 ohm cab and then when it is set at 16 ohm and the other one set at 16 ohm and the cabs are joined together, it will yield essentially a 6x12 with an 8 ohm rating?
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Unfortunately the 2x12 set at 16Ohms is only going to feed one 16Ohm speaker per jack on the plate. It will be running in stereo mode, left and right speakers should be independent....so...yeah, best case scenario is rewire the 4x12 to 16Ohms, and pick one speaker from the 2x12, resulting in a 5x12 setup.
 
Thatbastarddon said:
Unfortunately the 2x12 set at 16Ohms is only going to feed one 16Ohm speaker per jack on the plate. It will be running in stereo mode, left and right speakers should be independent....so...yeah, best case scenario is rewire the 4x12 to 16Ohms, and pick one speaker from the 2x12, resulting in a 5x12 setup.
Click to expand...

@Thatbastarddon - I have a switch on the back of my 2x12 that will give it 16 ohm and I assume that's running only one speaker?????
 
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