Changing speaker ohms

[Mikelamury]

I'm wanting to change the speaker in my Marshall mx112r 1x12 cab and it's currently got a 16 ohm seventy 80 in it and I'm want to put in a 8 ohm speaker in the cabinet. Is it as simple as replacing the speaker with a different one or is it more complicated than that to put in a speaker with a different ohm resistance? Sorry if this is a dumb question but I've never done this before. Thanks for any help on this matter.

 

[idsnowdog]

You should replace the speaker with the same ohm reading. You can get away with using speakers with different ohms on solid state but not tube amplifiers.

 

[Mikelamury]

You should replace the speaker with the same ohm reading. You can get away with using speakers with different ohms on solid state but not tube amplifiers.

Is it not possible to replace the speaker in the cabinet with a different ohm speaker? I can plug it into the correct ohm jack on the amp. To clarify I'm asking about changing the speaker in a cab not an amp. Thanks for the response.

 

[misterwhizzy]

You should replace the speaker with the same ohm reading. You can get away with using speakers with different ohms on solid state but not tube amplifiers.

MX112R is just a cabinet. He can replace with an 8ohm speaker as long as he matches it with the impedance selector (or matching output jack) on the amp.

 

[idsnowdog]

MX112R is just a cabinet. He can replace with an 8ohm speaker as long as he matches it with the impedance selector (or matching output jack) on the amp.

Yes, he can put whatever ohm speaker he wants in a cab. But he should still keep in mind what ohms the amplifier can run at and whether the speaker is being run alone, series, or parallel with another speaker. https://www.bustedgear.com/faq_Speaker_wiring.htm

 

[Demanic]

The answer being "as long as you match the impedance of the output of the amp".
Just remember, an 8ohm speaker isn't as tight as a 16 ohm.

Sent from my SM-A115A using Tapatalk

 

[dave74]

Just make sure and write the new ohms on the back of the cab. Just use a piece of duct tape to cover the old label and write on that.

 

[Demanic]

Why do you want to go to an 8 ohm?

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[dave74]

Why do you want to go to an 8 ohm?

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Probably because he already has an extra 8ohm speaker laying around. (?)

 

[misterwhizzy]

Because the 16-ohm is a Seventy 80.

 

[Mikelamury]

Why do you want to go to an 8 ohm?

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I want to put in an 8 ohm speaker so I can hook it up to my other cab (2x12 v30's) which passes 8 ohms to the other cab and my fender amp I just got only passes 8 ohms.

 

[jeremy]

huh?

two 8 ohm cabs in parallel are 4 ohms.

 

[Mikelamury]

huh?

two 8 ohm cabs in parallel are 4 ohms.

I asked Harley Benton who made the can and they said that the through jack on my 2x12 cab will pass 8 ohms to the cab it is hooked up to.

 

[Mikelamury]

huh?

two 8 ohm cabs in parallel are 4 ohms.

If this is not true I can still hook the 1x12 up to the other speaker jack on the amp but I'd like to know before I try hooking the 2cabs up. What would happen if you hooked up a speaker with the wrong ohm resistance?

 

[Demanic]

Because the 16-ohm is a Seventy 80.

I like the 70/80.

Sent from my SM-A115A using Tapatalk

 

[devastone]

I asked Harley Benton who made the can and they said that the through jack on my 2x12 cab will pass 8 ohms to the cab it is hooked up to.

I don't think you are understanding the whole ohms thing. Ohms don't get "passed" they are the impedance of the speaker(s) (we can call it resistance for simplification but it is technically impedance).

If you amp is rated at 8 ohms minimum, you can use 1X 8 ohm cab or 2X 16 ohm cabs in parallel. The jacks on the amp are paralleled. Making your 1-12 cabinet 8 ohms and using it with another 8 ohm cab will be an impedance of 4 ohms, which means the amp will try to supply more current, which could potentially overheat the output transformer and/or damage the output tubes. If you want to use both speaker jacks on the SuperSonic, you need 2 16 ohm cabinets.

 

[Mikelamury]

I like the 70/80.

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I'm not saying it's a bad speaker, it has an very deep low end but it is just not for me but I can see them working for someone playing a more aggressive style of music or down tuned metal.

 

[devastone]

2X 8 ohm cabinets is 4 ohms, unless they are hooked up in series, then it would be 16 ohms, but that usually requires some special cabling. Can you send a link to the 2-12 cabinet in question?

But yes, the cabinet will pass a signal through, but the TOTAL impedance won't be 8 ohms after it is hooked to something else.

Also note that it won't split the power equally to the speakers.

 

[Mikelamury]

2X 8 ohm cabinets is 4 ohms, unless they are hooked up in series, then it would be 16 ohms, but that usually requires some special cabling. Can you send a link to the 2-12 cabinet in question?

But yes, the cabinet will pass a signal through, but the TOTAL impedance won't be 8 ohms after it is hooked to something else.

Also note that it won't split the power equally to the speakers.

I was wording that incorrectly, I understand the ohms are resistance what I meant by passing ohms is that Harley Benton said that the through jack on the 2x12cab(which is 8ohms) would pass a signal needing 8 ohms of resistance.is this not true? I was misunderstanding the speaker jacks on the amp thanks for pointing that out. That seems weird that one jack is 8ohms but if I plug into the other jack it makes both jacks have 16 ohms of resistance? Am I understanding you correctly? Thanks for clarifying this for me as I was not clear on this subject myself.

 

[Mikelamury]

2X 8 ohm cabinets is 4 ohms, unless they are hooked up in series, then it would be 16 ohms, but that usually requires some special cabling. Can you send a link to the 2-12 cabinet in question?

But yes, the cabinet will pass a signal through, but the TOTAL impedance won't be 8 ohms after it is hooked to something else.

Also note that it won't split the power equally to the speakers.

https://harleybenton.com/product/g212-vintage-vertical/

Thanks for helping me to understand this it doesn't give much info on the website so I sent an email to them asking about the through jack and got the reply in really broken English so Im not surprised if they were incorrect or mistaken.