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Old 01-23-2013, 12:22 PM   #1
mark.bark
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First Cab build, is this possible?

I have just been given 2 12'' celestion speakers and have decided to attempt to build a cab. I have been saving for a vox nightrain 50 and to have to buy a cab just increases the length of time until i have what i want So with these speakers, and spare wood in the shed i'm going to have a go.

Am i right in thinking, all i need is to wire these in parallel straight to an input... and attach them to a wooden box?

Also, it crossed my mind that, for gigs, i would prefer 4x12. If i make this cab with 2 speakers, then when i have money to buy more speakers, get another 2, make another cab, would it be possible to connect these together? So i can have 2x12 for at home, then 4x12 for gigs? If so.... how?

Experience wise, i've build a shed and 3 chicken coups and rewired guitars. My thoughts are that a cab is kind of a combination of these...
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Old 01-23-2013, 12:40 PM   #2
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Depends on the speakers, what ohm rating are they?

If you use spade connectors you can have two speakers that you can just disconnect when you don't want them, but remember this will change the impedance.
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Old 01-23-2013, 12:44 PM   #3
mark.bark
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they are both 8 ohm. I was thinking from a transport point of view. 2 cabs mean i can bring one to practices/jams then bring both when i need em
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Old 01-23-2013, 12:59 PM   #4
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Quote:
Originally Posted by mark.bark
they are both 8 ohm. I was thinking from a transport point of view. 2 cabs mean i can bring one to practices/jams then bring both when i need em

Well if you wired them in series you'd have a 16 ohm cab, which is compatable with the amp.

The second one will have to be 16ohm as well and you plug them both into the 8ohm inputs and they run in parallel with each other, acting like an 8ohm cabinet.

I'm almost 100% on this but I'd wait for somebody else to confirm, amps aren't my thing.
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Old 01-23-2013, 01:12 PM   #5
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Quote:
Originally Posted by whoomit
Well if you wired them in series you'd have a 16 ohm cab, which is compatable with the amp.

The second one will have to be 16ohm as well and you plug them both into the 8ohm inputs and they run in parallel with each other, acting like an 8ohm cabinet.

I'm almost 100% on this but I'd wait for somebody else to confirm, amps aren't my thing.


Sounds right ^^ Just wire the speakers in each cab in series and then the cabs should be connected in parallel to the amp. that way you'll have 16ohm 2x12" and 8ohm 4x12"

Just be careful to always connect it to the right output on the amp ^^

edit: also about the amp - it has 16ohm and 8ohm output with 2 jacks, so you can connect either 1x8ohm or 2x16ohm cabs to it, therefore as said above, you can just connect both cabs straight into it without needing to wire them together or anything.

Last edited by KorYi : 01-23-2013 at 01:26 PM.
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Old 01-23-2013, 01:16 PM   #6
mark.bark
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on the back of the amp it has a the outputs are 1x8ohm, 2x16ohm and 16 ohm

is it a jack to jack to connect the two cabs together?

Cheers!
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Old 01-23-2013, 01:20 PM   #7
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Originally Posted by mark.bark
on the back of the amp it has a the outputs are 1x8ohm, 2x16ohm and 16 ohm

is it a jack to jack to connect the two cabs together?

Cheers!

1x16ohm cab into the far right jack.

If you're running both 16ohm cabs put them into the two left jacks.

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Old 01-23-2013, 01:27 PM   #8
mark.bark
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aha, perfect! This doesnt seem as complicated as i first thought.

Just for my own curiosity, whats the deal if the speakers were 16 ohm?
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Old 01-23-2013, 01:34 PM   #9
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You could have one plugged in the right jack.

You could have 2 wired in parallel for 8ohm and plug them into the left jack.

You could wire 4 wired in series-parallel giving you 16ohm and plug in the right jack.

I'm not sure how you would go about have two cabs to chop and change.
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Old 01-23-2013, 02:10 PM   #10
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Quote:
Originally Posted by whoomit
You could have one plugged in the right jack.

You could have 2 wired in parallel for 8ohm and plug them into the left jack.

You could wire 4 wired in series-parallel giving you 16ohm and plug in the right jack.

I'm not sure how you would go about have two cabs to chop and change.


wouldnt 2 16ohm speakers in parralel be 16 ohms?
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Old 01-23-2013, 02:16 PM   #11
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wouldnt 2 16ohm speakers in parralel be 16 ohms?

Nah, series equation is R = R1 + R2 + R3 + ...

And parallel is 1/R = 1/R1 + 1/R2 + 1/R3 +...

1/R = 1/16 + 1/16
1/R = 1/8

R = 8

http://www.eminence.com/support/wiring-diagrams/
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Old 01-23-2013, 02:18 PM   #12
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Quote:
Originally Posted by whoomit
Nah, series equation is R = R1 + R2 + R3 + ...

And parallel is 1/R = 1/R1 + 1/R2 + 1/R3 +...

1/R = 1/16 + 1/16
1/R = 1/8

R = 8

http://www.eminence.com/support/wiring-diagrams/



ah fack

brb rewiring cabinet

cant beleive i screwed that one up
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Old 01-23-2013, 02:31 PM   #13
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Originally Posted by supersac
ah fack

brb rewiring cabinet

cant beleive i screwed that one up

Uh oh
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Old 01-23-2013, 05:47 PM   #14
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Quote:
Originally Posted by supersac
wouldnt 2 16ohm speakers in parralel be 16 ohms?


Oh dear. This is why you shouldn't wire up cabs late at night .

Also, if you've only got two resistance terms in parallel, you can divide the product by the sum to give you the total resistance.

16*16/(16+16) = 256/32 = 2^8/2^5 = 2^3 = 8
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Old 01-23-2013, 11:33 PM   #15
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Originally Posted by eddiehimself
Oh dear. This is why you shouldn't wire up cabs late at night .

Also, if you've only got two resistance terms in parallel, you can divide the product by the sum to give you the total resistance.

16*16/(16+16) = 256/32 = 2^8/2^5 = 2^3 = 8



yeah i know ohm law and stuff ive been doing cabinets and amps for like 3 years now
i just had a "ive been up for too long looking at schematics" moment
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