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Old 01-22-2013, 07:33 PM   #1
makutoid
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Multiple Speaker Cabs?

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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Old 01-22-2013, 07:43 PM   #2
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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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Old 01-22-2013, 07:52 PM   #3
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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?
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Old 01-22-2013, 08:06 PM   #4
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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
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Old 01-22-2013, 10:12 PM   #5
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Old 01-22-2013, 10:19 PM   #6
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Quote:
Originally Posted 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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Old 01-23-2013, 12:40 AM   #7
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Quote:
Originally Posted 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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Old 01-23-2013, 12:59 AM   #8
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4x4x12. Are you nuts dude?
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Old 01-23-2013, 01:56 AM   #9
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Quote:
Originally Posted 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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Old 01-23-2013, 06:05 PM   #10
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Quote:
Originally Posted by Eppicurt
4x4x12. Are you nuts dude?

It shall handle, ALL of the power.

Quote:
Originally Posted 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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