Another ohm compatability question using one head and two cabs

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jmb79
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Another ohm compatability question using one head and two cabs

Post by jmb79 » Sun Jul 28, 2019 1:39 am

I have a Orange CR 120 head. I have been using an Orange PPC212 (closed back) cab. Today I stumbled into a used Orange PPC212-OB cab that was almost free. I want to run the CR120 head through both cabs at once. The head has two output jacks so, do I simply run speaker cables from the head to both cabs or do I run one speaker cable from the head to one cab, and from that cab run a second cable to the other cab? Will either way work? If either way works, is one preferred over the other and why?

Many thanks.
Last edited by jmb79 on Sun Jul 28, 2019 10:22 am, edited 1 time in total.

Jondog
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Re: Another ohm compatability question

Post by Jondog » Sun Jul 28, 2019 2:19 am

jmb79 wrote:
Sun Jul 28, 2019 1:39 am
I have a Orange CR 120 head. I have been using an Orange PPC212 (closed back) cab. Today I stubbled into a used Orange PPC212-OB cab that was almost free. I want to run the CR120 head through both cabs at once. The head has two output jacks so, do I simply run speaker cables from the head to both cabs or do I run one speaker cable from the head to one cab, and from that cab run a second cable to the other cab? Will either way work? If either way works, is one preferred over the other and why?

Many thanks.
Are both outputs on the CR120 the same impedance? If so either way works. No real benefit one way or the other.
Image

jmb79
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Re: Another ohm compatability question

Post by jmb79 » Sun Jul 28, 2019 10:20 am

The two speaker outputs have the following written below them:

"1 x 8 ohms or 1 x 16 ohms or 2 x 16 ohms (minimum total impedance 8 ohms) speaker outputs are wired in parallel"

northernguitarguy
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Re: Another ohm compatability question

Post by northernguitarguy » Sun Jul 28, 2019 12:25 pm

jmb79 wrote:
Sun Jul 28, 2019 10:20 am
The two speaker outputs have the following written below them:

"1 x 8 ohms or 1 x 16 ohms or 2 x 16 ohms (minimum total impedance 8 ohms) speaker outputs are wired in parallel"
If both cabs are 16 ohm, you can plug them into the outputs marked '8 ohms'. If both cabs are 8 ohms, you can't do this, but you could either buy or make a 'parallel box' to run the two 8 ohm cabs at 16 ohms.

jmb79
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Re: Another ohm compatability question using one head and two cabs

Post by jmb79 » Sun Jul 28, 2019 1:47 pm

Both cabs are 16 ohms. It would seem that since the amp reads "2 x 16 ohms" I should be ok. Why do you say both cabs can be 8 ohms when the back of the amp doesn't provide for that option?

Mr Mustard
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Re: Another ohm compatability question

Post by Mr Mustard » Sun Jul 28, 2019 2:19 pm

northernguitarguy wrote:
Sun Jul 28, 2019 12:25 pm
If both cabs are 8 ohms, you can't do this, but you could either buy or make a 'parallel box' to run the two 8 ohm cabs at 16 ohms.
You would need a "series box" to run two 8 ohm cabs at 16 ohms.
Mr. Mustard

northernguitarguy
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Re: Another ohm compatability question

Post by northernguitarguy » Sun Jul 28, 2019 10:50 pm

Mr Mustard wrote:
Sun Jul 28, 2019 2:19 pm
northernguitarguy wrote:
Sun Jul 28, 2019 12:25 pm
If both cabs are 8 ohms, you can't do this, but you could either buy or make a 'parallel box' to run the two 8 ohm cabs at 16 ohms.
You would need a "series box" to run two 8 ohm cabs at 16 ohms.
Oops. Yup, they would need to be run in series.

northernguitarguy
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Re: Another ohm compatability question using one head and two cabs

Post by northernguitarguy » Sun Jul 28, 2019 10:54 pm

jmb79 wrote:
Sun Jul 28, 2019 1:47 pm
Both cabs are 16 ohms. It would seem that since the amp reads "2 x 16 ohms" I should be ok. Why do you say both cabs can be 8 ohms when the back of the amp doesn't provide for that option?
I didn't. I said you couldn't run two 8 ohm cabs, unless you run them in series (I goofed and said 'parallel'). Just plug a 16 ohm cab each in the 8 ohm outputs and rock out.

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Re: Another ohm compatability question using one head and two cabs

Post by Phlowen » Tue Jul 30, 2019 6:52 pm

northernguitarguy wrote:
Sun Jul 28, 2019 10:54 pm
I didn't. I said you couldn't run two 8 ohm cabs, unless you run them in series (I goofed and said 'parallel'). Just plug a 16 ohm cab each in the 8 ohm outputs and rock out.
I think you're confusing him by saying "the two 8ohm outputs" the CR120 doesn't have 8ohm outputs like some of the other amps do. It just has 2 outputs total and (at least in images online) they're both labeled 16 ohms.

jmb79, plug each cab into the head and you should be fine.
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Mr Mustard
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Re: Another ohm compatability question using one head and two cabs

Post by Mr Mustard » Tue Jul 30, 2019 11:04 pm

Phlowen wrote:
Tue Jul 30, 2019 6:52 pm
jmb79, plug each cab into the head and you should be fine.
Or, getting back to your original question, you can also run one speaker cable from the head to one cab, and from that cab run a second cable to the other cab. Either way will work the same.
Mr. Mustard

jmb79
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Re: Another ohm compatability question using one head and two cabs

Post by jmb79 » Wed Jul 31, 2019 10:17 am

Thanks everyone for all the help. I've managed to not damage anything and the two different cabs sound really good together.

northernguitarguy
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Re: Another ohm compatability question using one head and two cabs

Post by northernguitarguy » Wed Jul 31, 2019 12:25 pm

Phlowen wrote:
Tue Jul 30, 2019 6:52 pm
I think you're confusing him by saying "the two 8ohm outputs" the CR120 doesn't have 8ohm outputs like some of the other amps do. It just has 2 outputs total and (at least in images online) they're both labeled 16 ohms.

jmb79, plug each cab into the head and you should be fine.
Oops again! Sorry to OP for any confusion on my part. I'm glad you got this all working!

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