Building a 2x12 Cab

DiamondJQuimby

Hey,

I am looking to build a 2x12 Cab as an add on to a JCM 2000 TSL 60 watt combo

I am trying to figure out what Celestions to get for it, From the TSL manual I need to go for a 16ohm configuration if I want to use in conjunction with the two internal speakers and set the output selector at the back to 8ohms

I have read that 2 X 8 Ohm Speaker = 16 Ohm Load when wired in series
I was thinking of getting One G12-H and one Vintage 30 (both 8ohm speakers)

Does this sound right??

Any help apprecietad

Cheers

D

Sandwich117

Mixing speakers isn't a good idea......to be honest it's a bad idea. lol...personally I'd go with 2 vintage 30's or Alnico Blues.

Voodu Child

Absolutely nothing wrong with mixing speakers. A lot of high-end 2x12 and 4x12 have mixed speakers. A vintage 30 with a GH12 is one of the most popular options with custom builder Avatar.

Your ohmage assumptions are fine.

Sandwich117

lol...I always though mixing speakers was a bad idea, because the sound would be mixed...ah well, guess I was wrong. :P

Voodu Child

Well, it'd only be bad if the two speakers didn't compliment each other, which is possible. But a careful choice of two speakers can give the best of both worlds. A V30 and G12H is a good combination by all accounts, a lot of guys use it.

DiamondJQuimby

Thanks for that.. Much Appreciated.

Will post up Pics when I have it completed just waiting on the speakers,

I have a question about wiring I am wiring as shown in the attachment,

I am using the Jack which is attached.

How do I know which is the Tip and which is the Ring on the Jack..
Any help Appreciated

Cheers

D

Voodu Child

Well, the tip is literally the 'tip' of the 1/4" plug. The ring is the rest of the body of the plug, separated from the tip by a plastic segment. (a stereo or TRS will have three, tip/ring/sleeve).

SO, in that mono jack socket you've got there, the tip of the plug will correspond to the furthest connector.

DiamondJQuimby

Smashing

Thanks

D

DeadSkin

Nice to see people here take on projects like this, looking forward to some pictures.
I've finally started to get the ball rolling with a little project aswell, I'm gonna take a stab at a 1X12 cab, voodoo_child here found plans for a Mesa Thiele style cab[much obliged ].
I got the speaker a few weeks ago, a Celestion G12K-100 Speaker 8 Ohm.
Had to put it on the long finger there for a while, but will be starting it over the next week or so.
Just out of curiosity DiamondJQuimby, where did you get your materials and what plans or cab have you based it on?

Gaspode

I have an old 4x12 I was thinking of breaking down into something smaller, so I'd be interested in any plans that people might have for doing this type of thing.
Maybe put them in the resources sticky?


Scoots off to check if they are there already....

Ok, cant see anything jumping out at me on 'Speaker Cabinet construction' so I think I'm safe suggesting that.

Voodu Child

DeadSkin wrote:

I've finally started to get the ball rolling with a little project aswell, I'm gonna take a stab at a 1X12 cab, voodoo_child here found plans for a Mesa Thiele style cab[much obliged ].

You're welcome. I'm using a thiele myself now, loaded with a 200watt EVM-12L. Unbelievable bass response from such a small box.

Did you get the thiele-small parameters for the Celestion G12K to double check all the dimensions off?

so I'd be interested in any plans that people might have for doing this type of thing.

There's some good info here:
http://www.ishtek.com/spkrs.htm
I'd suggest doing a lot of reading up before building anything. A good speaker cab shouldnt be a random box, dimension are important from an acoustic point of view.
Some good stuff there specific to the thiele as well Deadskin, definitely worth a read if you havent seen it already.

DeadSkin

voodoo_child wrote:

Did you get the thiele-small parameters for the Celestion G12K to double check all the dimensions off?
There's some good info here:
http://www.ishtek.com/spkrs.htm
I'd suggest doing a lot of reading up before building anything. A good speaker cab shouldnt be a random box, dimension are important from an acoustic point of view.
Some good stuff there specific to the thiele as well Deadskin, definitely worth a read if you havent seen it already.

I was wondering alright about the speaker I got would I have to check again for the dimensions. I got the specs of the speaker there from Celestion's website and went to put them thru' that ishtek link.
I'm having a problem with filling in all the criteria under the 'Choose Speaker' section.
I don't know the, Electrical Q[Qes], Mechanical Q[Qms], Compliance Volume[Vas] litres, Diaphragm Area[Sqd] sq.metres and the Maximum linear displacement[Xmax] mm.
Can ya help us out there voodoo_child

Voodu Child

DeadSkin wrote:

Can ya help us out there voodoo_child

Most manufacturers simply publish the thiele-small parameters as part of their specifications. As in, literally list them under a heading called 'Thiele-small Parameters', ready to be plugged straight into the formulae. So it's very easy for non-technical people to use them.

Celestion, for whatever reason, claim that the thiele-small parameters arent of any significance when it comes to guitar cabinet design. Hence, they don't actually publish them on the website.

I'd say your best bet is to e-mail their helpdesk, or just do a judicious bit of googling. Im sure you're not the first person to go looking for them, so they must be out there somewhere.

DeadSkin

voodoo_child wrote:

You're welcome. I'm using a thiele myself now, loaded with a 200watt EVM-12L. Unbelievable bass response from such a small box.

Did you build it yourself?

voodoo_child wrote:

Celestion, for whatever reason, claim that the thiele-small parameters arent of any significance when it comes to guitar cabinet design. Hence, they don't actually publish them on the website.

Hmmm, this is just confusing me now!!!! Just found it there on their website, this suggests to me I shouldn't really have a problem, anywho, I'll send them a mail and see what they come back with, cheers voodoo.
Got a sheet of mdf yesterday, I just wanna tear into it.......must.......resist

Voodu Child

Just crack away using the EV plans so. I reckon that's what most people do anyway, using the TSP formulae to come up with a port design gets pretty technical anyway, even with the help of design programs.

Im not sure what kind of a difference it'll make between being perfectly tuned to the driver or not, but sure give it a bash anyway.

Did you build it yourself?

No, I didn't build mine, it's just one of the Mesa/Boogie ones. I'm planning on building a hardwood combo cabinet for my F-50 head shortly though, so I might post up some pics if I ever get around to it...

DeadSkin

voodoo_child wrote:

Just crack away using the EV plans so. I reckon that's what most people do anyway, using the TSP formulae to come up with a port design gets pretty technical anyway, even with the help of design programs.

Im not sure what kind of a difference it'll make between being perfectly tuned to the driver or not, but sure give it a bash anyway.


No, I didn't build mine, it's just one of the Mesa/Boogie ones. I'm planning on building a hardwood combo cabinet for my F-50 head shortly though, so I might post up some pics if I ever get around to it...

I've sent off a mail to Celestion this morning, so we'll see what they'll say.
Hardwood, very fancy, you gonna go with some fancy joinery?
Was gonna try some dovetails with pine, but decided it'd be more straight forward with mdf and a bucket of glue