makutoid
Registered Rocker
Join date: Mar 2008
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#1
So on a lot of big stages you see piles of amp stacks all over the place, and I am aware that a lot of the time they're fake/hollow/unused and simply for show. For curiosity's sake, can you hook up (for example) 4 speaker cabs to an amp head with only 2 speaker outputs? If you can do it with some sort of splitter (excuse the lack of possible technical terminology) would it not just blow the amp?

For example's sake, let's assume I want to hook up 4 Marshall 1960A 4x12 cabs to my 100watt JCM900 head. Any way to do it?

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Overkill pedalboard..
Robbgnarly
Tab Contributor
Join date: Feb 2011
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#2
2 16 ohm cabs =8 Ohms so with 4 16 ohm cabs you would draw 4 ohms total (in parallel)

So really in the best conditions you can run 4 16ohm 4x12 cabs safely with an ampm that can run a 4 ohm load
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makutoid
Registered Rocker
Join date: Mar 2008
2,740 IQ
#3
I'm not really that great with the whole ohms idea other than knowing I have to make sure the numbers add up but I think I get that Cheers

Along similar lines, what is the purpose of adding extra cabs? At the moment I only use one 4x12 cab and have my amp as a "half-stack". My understanding is that the amp head will only produce 100watts of volume, so adding more speakers will just dissipate that volume through more speakers but won't actually make it any louder. Am I right, or horribly deluded?

Yamaha Superflighter addict - Got all 6

PRS SE Angelus Custom

Marshall JCM900 4100
Marshall 1960A 4x12

Overkill pedalboard..
Last edited by makutoid at Jan 22, 2013,
Robbgnarly
Tab Contributor
Join date: Feb 2011
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#4
It will be a little louder as you increase surface area you will increase DB leveles, but not by signifigant levels.

The answer to your more cab question .....most bands you see are only using a few of the 50 4x12 cabs to play through the rest are just for show
2002 PRS CE22
2013 G&L ASAT Deluxe
2009 Epiphone G-400 (SH-4)
Marshall JCM2000 DSL100
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Krank Rev 4x12 (eminence V12)
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Morley Bad Horsie 2
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Cathbard
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#5
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Last edited by Cathbard at Jan 22, 2013,
Viban
UG's resident bum
Join date: Nov 2011
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#6
Quote by Robbgnarly
2 16 ohm cabs =8 Ohms so with 4 16 ohm cabs you would draw 4 ohms total (in parallel)

So really in the best conditions you can run 4 16ohm 4x12 cabs safely with an ampm that can run a 4 ohm load

Actually, if wired in series-parallel, then 4 16 ohm cabs would be running at 16 ohms.
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cdr_salamander
or simply Nick
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#7
Quote by Cathbard

I love how this picture always resurfaces when threads like this come up.

But yeah, it doesn't really make sense to use more than a full stack on stage anymore. Hell, most 4x12s can be ran and mic'd in stereo now thanks to the PA. It also keeps the front rows of the audience from going deaf.
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Eppicurt
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#8
4x4x12. Are you nuts dude?
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Cathbard
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#9
Quote by cdr_salamander
I love how this picture always resurfaces when threads like this come up.

But yeah, it doesn't really make sense to use more than a full stack on stage anymore. Hell, most 4x12s can be ran and mic'd in stereo now thanks to the PA. It also keeps the front rows of the audience from going deaf.
A picture says a thousand words.

Running more than one cab can have another use - the feedback angle. Either kicking in a whole extra amp as well to push it over the edge or dissimilar cabs that you can point the guitar at.
I used a 2x12 on top of a 4x12. Once getting the string feeding if I leaned back to aim at the top box the higher harmonics would ring out better. I could make the feedback change as I desired.
More than two cabs would be redundant really though methinks. Beyond that you're simply into the realm of the stage prop - and there's nothing wrong with a bit of theatre in your show.
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Viban
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#10
Quote by Eppicurt
4x4x12. Are you nuts dude?

It shall handle, ALL of the power.

Quote by Cathbard
Beyond that you're simply into the realm of the stage prop

Unless you've just got THAT much power to handle
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Last edited by Viban at Jan 23, 2013,