4x12 cab with 2 top speakers only...anyone try this?

Fretmaster

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I've seen pics of a couple rigs like this and heard clips that sound incredible. I like the idea both from a weight stand point and overall output stand point. Anyone have any experience with this you could share?

Thx, Steve
 

somedude

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I've never tried it with guitar speakers, but from my experience with other types of speakers it might sound kinda boomy.

But....if you already own a 4x12 there's a really simple test you can perform to find out for sure. ;)
 

johnspeck

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Depends. Do you mean with the bottom two speakers removed? Is the cab a slant or a straight? I've experimented with a slant with the both bottom/top two alternately removed. I found it to sound a little boomy in an uncrontrolled, 'untuned' way. Sort of woofy and loose. Maybe with a ported rear panel it would sound differently. A straight would have less phase cancellation.
I would suggest looking into a detuned cab maker. I've heard of detuned 4-12's, but don't know what the difference is between one and a standard 4-12.

What rigs/samples are you referring to?
 

Fretmaster

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Originally posted by johnspeck

What rigs/samples are you referring to?
Al Estrada (spelling?) for instance uses a 4x12 with only the top 2 speakers loaded with EVM 12L's and his tone is amazing! I know the EVM 12L is not the usual guitar speaker so maybe that's the key why it works so well for him.:confused:
 

Mayflower

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I ran my 69 50 watt Plexi and cabinet that way for years(79-90).
Wired at 8 ohms instead of the normal 16.
Always liked it. Then one day in the 90's a put the other two back in and really haven't used it much since. I do remember the effect of pushing more air with it fully loaded.
I did it originally as a plan to reduce weight and stage volume.
It seemed to work great and always had comments about the tone. Of course I was using a Scholz Rockman in the front end!
(Where are my spandex and headband anyway?):)
 

Fretmaster

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Originally posted by 90wreck

I did it originally as a plan to reduce weight and stage volume.
this is exactly why I was hoping for good results. I really doubt I can beat the sound of a fully loaded 4x12 but man, my back!:(
 

somedude

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Originally posted by Fretmaster
this is exactly why I was hoping for good results. I really doubt I can beat the sound of a fully loaded 4x12 but man, my back!:(
Wouldn't it be lighter if you removed the whole bottom half of the cab (ie, replace it with a 2x12)?
 

Fretmaster

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Originally posted by screamingdaisy
Wouldn't it be lighter if you removed the whole bottom half of the cab (ie, replace it with a 2x12)?
I have several 2x12 cabs already. I was trying to retain the fuller sound of the 4x12 and cut the weight and volume at the same time.
 

j_el_jee

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If its too boomy, what about covering the lower speaker cutouts with some plywood on the inside? you could even try 'porting' the plywood with a holesaw. At least that would be reversable if it didn't work out.

I don't know... just a thought.

My favorite cab was originally a half open cab, so the bottom is completely sealed from the top. I guess it wouldn't do me much good to remove the lower speakers. :(
 

fatback

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Even easier, how about just disconnecting the bottom two speakers. The "dummy cones" might dampen some of the boominess. I know this wouldn't help with the cabs weight, but might be a cool experiment anyways.
 

johnspeck

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From what I'm reading, the tone I didn't like must have been the phase-cancellation due to the slant cab. I now use a straight, I'll try it again and see how it sounds. I'm only playing a 33-watt amp, and the lighter weight and more open dispersion on a stage appeal to me.
 

rick66

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i want to try this on my cabinet. its a slant cab, 4 16 ohm speakers with the entire cabinet rated 16 ohms. if i remove the bottom 2 speakers, will it change the ohm rating by running just the top two and if so, to what? thanks in advance for your help.
 

johnspeck

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You would have to rewire the two speakers for 8 ohms. Connect the positive terminal from one speaker to the negative terminal of the other, then wire the remaining positive and negative from each speaker to the jack.
 

rick66

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hmmm. john, i tried this and get a reading of 16 ohms on my meter?? i'm using clips instead of soldering. positive from the jack to positive of speaker #1. from #1 positive, to negative of #2. from negative of #2 to negative on jack??
 

rick66

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i tried this and got a reading of 8 ohms: positive (tip) of jack to positive of speaker #1. ran another wire from positive of #1 to positive of #2. negative of jack to negative of speaker #2. ran a wire from negative of speaker #2 to negative of speaker #1. read 7.4 ohms.
 

johnspeck

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Sorry, I was thinking series when I should have been thinking parallel.

You're right, combine the two +'s and the two -'s.
 

FracStrat

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I would like to bump up this thread …… It's 13 years old …… I am interested in whether any of you guys have any actual experience with doing this ……
 

DC1

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I’ve done it. It’s nice, but different. More open and combo-ish, but it loses some of the fatness and mids of the normal setup. After a couple years, I put the other 2 speakers back in, and prefer that overall.

dc
 




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