Amp cab gurus - can I do this?

[Aceman]

I have a Marshall VS100R. There are two Speaker outs on the back.

- One runs to a 12" Celestion Gold Back There is another output that says "Total Load must not be less than 4 ohms" and the amp is 100w 4 ohms

Can I plug this amp into this without melting something or exploding?

MX212 2 x 12 Inches 160 Watt Guitar Amplifier Speaker Cabinet - 160w 8 ohm mono

 

[dystrust]

Re: Amp cab gurus - can I do this?

I have a Marshall VS100R. There are two Speaker outs on the back.

- One runs to a 12" Celestion Gold Back There is another output that says "Total Load must not be less than 4 ohms" and the amp is 100w 4 ohms

Can I plug this amp into this without melting something or exploding?

MX212 2 x 12 Inches 160 Watt Guitar Amplifier Speaker Cabinet - 160w 8 ohm mono

It should be ok. Do you know the impedance of the amp's internal speaker? If the amp's internal speaker is 8 ohms, running that cab in parallel will yield a total load of 4 ohms. If the internal speaker is 16 ohms, your total load would be 5.3.

 

[jeremy]

Re: Amp cab gurus - can I do this?

if the internal speaker was 4 ohms (not the case) youd be at 2.7ohms which wouldnt be good. my guess is the internal speaker is 8 ohms, it is stock right?

 

[Aceman]

Re: Amp cab gurus - can I do this?

Correct - stock speaker

 

[Aceman]

Re: Amp cab gurus - can I do this?

So that would be a total of THREE (3) speakers

One out to one 8 ohm, and one out to two 8 ohms speakers.

 

[Aceman]

Re: Amp cab gurus - can I do this?

And what about a 4x12 - I have done that before. Any reason not to? (<= that's a separate question)

 

[IM4Tone]

Re: Amp cab gurus - can I do this?

You stated in the original post that the cab was 8 ohms. Since it's a 2X12, the speakers in it are in all likelihood 16 ohms wired in parallel. The amp will see two 8 ohm loads in parallel yielding 4 ohms...doesn't matter that the 2X12 is two speakers for reasons of impedance.

Again, regarding the 4X12....the importance is the overall impedance of the cab, not the # of speakers. If it's 8 ohms, you're set.

 

[Aceman]

Re: Amp cab gurus - can I do this?

Again - just checking…because I'm slow with this…

Combo single 8 ohm speaker + Cab with two 8 ohm speakers = no explosions, especially of the amp….right?

 

[dystrust]

Re: Amp cab gurus - can I do this?

Again - just checking…because I'm slow with this…

Combo single 8 ohm speaker + Cab with two 8 ohm speakers = no explosions, especially of the amp….right?

That depends on how the cab is wired; the impedance of the speakers isn't the important factor. If those two 8-ohm speakers are wired in series, the load will be 16 ohms for the cab and 5.3 ohms total which is fine. Wire those same speakers in parallel, and it goes to 4 ohms for the cab and 2.6 ohms total which would be a problem.

 

[Aceman]

Re: Amp cab gurus - can I do this?

Dangit! I can't find the series/parellel.

Marshall says it is good for any head or a 2x12 combo….but doesn't specify.

I may just have to get the 1x12. Or…my other option - slave another VS100 to the first using the emulated out into the fx return!

 

[GoldenVulture]

Re: Amp cab gurus - can I do this?

Loudspeaker Jacks
For connection to external loudspeakers. The minimum operating impedance for the VS100R, VS100H. & VS102R is 4 Ohms.
The internal speaker on the VS100R/VS102R is rated at 8 Ohms, therefore if using an external speaker in conjunction with the internal speaker, the external speaker should be rated at 8 Ohms.

- http://www.amparchives.com/Amp Arch...& VS102R Combos and VS100RH Head Handbook.pdf -

Again - just checking…because I'm slow with this…

Combo single 8 ohm speaker + Cab with two 8 ohm speakers = no explosions, especially of the amp….right?

 

[IM4Tone]

Re: Amp cab gurus - can I do this?

Again - just checking…because I'm slow with this…

Combo single 8 ohm speaker + Cab with two 8 ohm speakers = no explosions, especially of the amp….right?

NO...that's contradictory to what you stated in the original post..."MX212 2 x 12 Inches 160 Watt Guitar Amplifier Speaker Cabinet - 160w 8 ohm mono"

The combo's single 8 ohm speaker + the cab whose total impedance is 8 ohms is what it is designed for. You can't have a cab with two 8 ohm speakers connected to each other yielding an overall impedance of 8 ohms. One of your statements is incorrect. Is the cab impedance 8 ohms, or is each speaker in the cab 8 ohms?....can't be both.

 

[Aceman]

Re: Amp cab gurus - can I do this?

Excellent point; Either way - will my amp explode?

 

[IM4Tone]

Re: Amp cab gurus - can I do this?

Excellent point; Either way - will my amp explode?

If the cab's total impedance is 8 ohms, using it in conjunction with the internal 8 ohm speaker is what it's designed for..... no smell, no smoke, no explosion....just a good sound! :bigok:

The other way, if each speaker is 8 ohms and they are wired in parallel, the cab's total impedance is 4 ohms. Combined with the internal 8 ohm speaker, that yields 2.7 ohms. Not recommended, but it shouldn't 'explode'! Sound imbalance will occur since the cab will get 2/3 of the power and the internal speaker 1/3.

If the two speakers in the 2X12 are wired in series, the cab's total impedance is 16 ohms which combined with the internal speaker yields 5.3 ohms. This is not a problem, but imbalance will occur in reverse....the internal speaker will get 2/3 of the power and the cab 1/3.

Understand?

 

[Aceman]

Re: Amp cab gurus - can I do this?

Got it - all about the parallel, or not! I'm not optimistic since the extension says 8 ohms with 2 speakers…I'm guessing parallel.

 

[jeremy]

Re: Amp cab gurus - can I do this?

alright there acebob... the interwebz tells me things about yer stuff

the cab is 8 ohms, your stock speaker is 8 ohms. you can use both of those with your amp with no issues.

 

[IM4Tone]

Re: Amp cab gurus - can I do this?

Got it - all about the parallel, or not! I'm not optimistic since the extension says 8 ohms with 2 speakers…I'm guessing parallel.

I'd interpret that as 8 ohms for the cab's total impedance. If THIS is it, you're all set...plug and play.

 

[Rand-O-Monium]

Re: Amp cab gurus - can I do this?

Been there,done it.

You'll be fine!

 

[Kamanda~SD]

Re: Amp cab gurus - can I do this?

Or…my other option - slave another VS100 to the first using the emulated out into the fx return!

No. Do not run your emulated out into the FX return. It's not damaging, just will sound like ****. You dont want an emulated sound hitting a power amp, you want pure preamp.

alright there acebob... the interwebz tells me things about yer stuff

the cab is 8 ohms, your stock speaker is 8 ohms. you can use both of those with your amp with no issues.

Yes.

 

[Aceman]

Re: Amp cab gurus - can I do this?

So it is 8 ohms mono…..

I'm gonna try it.