JJ Jr with two Friedman 2x12 cabs?

S

Steve72

New member
Hi,
Is it safe/advisable to power two Friedman 2x12 8 ohm cabs with the JJ Jr head?

I can see that with the Dirty Shirley Mini it seems that you need 16 ohm cabs to run two of them from it (pls correct me if I am wrong here) but the JJ Jr manual is not specific as to this possible setup.

Thanks
 
MetalheadMike is right, you can run two 16ohm cabs (with the switch at 8ohms) on the JJ jr but two 8 ohm cabs will present 4ohms to the output transformer. I've heard there is a unused 4ohm tap on the transformer, you could ask Dave to rewire it for you.

Or you could make a little box with three 1/4 jacks and wire them in series using the diagram Mike provided to get the cabs to show 16ohm to the amp. Or get something like this: https://www.palmer-germany.com/en/products/signal-splitter-switcher/5088/cab-m
 
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Wow - that must have been quite a stack! I used to run two 2x12's but I eventually went to a single 4x12 for my 20w Friedman.
 
You can safely run an 8ohm cab into a 4ohm speaker jack. You cannot, however, run a 4ohm cab into an 8ohm speaker jack.
 
Waldo Nova said:
You can safely run an 8ohm cab into a 4ohm speaker jack. You cannot, however, run a 4ohm cab into an 8ohm speaker jack.
Click to expand...

That's the way I understood it too...but was reading different sources of info on impedance yesterday and came across an article that stated it was perfectly fine, and safer, to mismatch the opposite way (they were talking 4ohm cab into 16ohm amp out). Look towards the bottom of the article; Case 2 :confused:

http://blog.hughes-and-kettner.com/ohm-cooking-101-understanding-amps-speakers-and-impedance/
 
MetalHeadMike said:
That's the way I understood it too...but was reading different sources of info on impedance yesterday and came across an article that stated it was perfectly fine, and safer, to mismatch the opposite way (they were talking 4ohm cab into 16ohm amp out). Look towards the bottom of the article; Case 2 :confused:

http://blog.hughes-and-kettner.com/ohm-cooking-101-understanding-amps-speakers-and-impedance/
Click to expand...

That's not right and you should not try it. If that were true, loads wouldn't matter at all and we would all be plugging everything into everything. :)
 
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