Hooking an 8ohm head to an 8ohm cab AND a 16ohm cab.

[PsychoholicSlag]

Anyone see any problems with this? I have a great lead on a killer cab, but it's 16ohms. I know you can't for from a 16ohm head to an 8ohm cab, but any problems with running this type of combo? Is there a way around it if so?

Thank you.

 

[Anonymous]

I'm not sure I quite understood, but you can (although not optimal) run an 8 ohm head into anything higher.
You can't run a 16 ohm head into anything lower than 16
16 and 8 ohm in parallel would be *edit* 5.33 ohm

 

[PsychoholicSlag]

I'm wanting to run a full stack,

8ohm head ->

8ohm cab & 16ohm cab


Seeing what everyone's opinion is. And why if not.

 

[Anonymous]

http://www.marshallforum.com/marshall-amps/10837-8ohm-16ohm-cabs-together.html

 

[PsychoholicSlag]

Very awesome, thanks

 

[Anonymous]

first, clarify what amp it is!

if it's a mesa, yes, you can run mismatches.

 

[PsychoholicSlag]

Ah sorry wasn't know if that was needed. It's a Krank Rev1, I've heard the build specs are around a Sovtek Mig but not sure on that. It's a great sounding amp and have tons of compliments on my tone, just saying that before the bashing starts haha.

 

[Anonymous]

Ah sorry wasn't know if that was needed. It's a Krank Rev1, I've heard the build specs are around a Sovtek Mig but not sure on that. It's a great sounding amp and have tons of compliments on my tone, just saying that before the bashing starts haha.

Those have 2 speaker outputs and an ohm selector
If you want to use those 2 cabs, put that switch at 4 ohm, as mentioned on the Marshall forum

 

[Buckeyedog]

Yes, 4 ohm as the total load will be 5.33. Remember though, your 8 ohm cab will take twice the power of the 16 ohm cab.

 

[PsychoholicSlag]

I'm sorry, but what do you mean by that.

 

[rokket2005]

One cab will significantly louder than the other

 

[PsychoholicSlag]

Oh ok, and by significantly do you mean like how people compare 50w tube to 100w tube (I know I know there's differences, let's not get side tracked) or will there be a highly audible difference. I'd assume the 8ohm would be louder.

 

[Buckeyedog]

Basically if you have a hundred watt head, the 8 ohm cab would be at 66 watts and the 16 ohm cab would be at 33 watts. But considering the wattage and the db thing, where when the wattage doubles, the sound increases by 3 db. So the 8 ohm cab would be approx. 3 db louder than the 16 ohm cab.

 

[PsychoholicSlag]

Hmm, that's significant, but that might work in my favor because the 16 would be on the bottom and if the house needs to mic they would mic the lower wattage. In the larger venues we play that could help me out because at times I can't hear myself and when they turn up my front monitors on my guitar channel I will get interference.

 

[paulyc]

You could rewire the 16 ohm cab to be 8 ohm like the other one...if it's all 16 ohm speakers...or rewire the 8 ohm cab up to 16 if it's all 8 ohm speakers (assuming both cabs are 4x12s)...or you could have the existing speakers in ONE cab re-coned into the others ohm rating, or buy different speakers to put in the cab.

 

[RSRD]

not to take away from the OPs question but since it seems to be answered.... what if you have a 2X12 with 2 8 ohm speakers and a 1X12 with a 8 ohm speaker..... run the amp at 4 ohms yeah?

 

[moronmountain]

not to take away from the OPs question but since it seems to be answered.... what if you have a 2X12 with 2 8 ohm speakers and a 1X12 with a 8 ohm speaker..... run the amp at 4 ohms yeah?

yeah, so long as the 2x12 is wired to be 16 total, and not 4 total. if it's 4 total then you really shouldn't run them together since your total load would be less than 3 ohms I think, (without doing the actual math).

 

[Buckeyedog]

It's product/Sum so if it was 4 and 8, then you'd have 4*8/(4+8) = 32/12 = 2.66 ohm. Not good!!

And Pauly, you can't rewire 4 16 ohm speakers to an 8 ohm total and you can't wire 4 8 ohm speakers to a load of 16 ohms. The 16' are either 16 or 4. 8's can go to 8 or 2 or 32.

 

[paulyc]

oops.

 

[Anonymous]

not to take away from the OPs question but since it seems to be answered.... what if you have a 2X12 with 2 8 ohm speakers and a 1X12 with a 8 ohm speaker..... run the amp at 4 ohms yeah?

depends if that 2x12 is series or parallel.

parallel reduces the load (ie, 8 and 8 = a 4 ohm load)

series increases it (ie, 8 and 8 = 16)

so it all depends on the wiring.