building a 4x12 cabinet ?

[skarhead]

as somebody may remember i found 2 celestions g12 100 h , and i don't want them to just lay around useless

the idea is to make a 4x12 cab with them

i have exact plans of a marshall 1960a , so i could ( or let somebody ) do it.

i have the following questions :

should i use :

plywood ( birch ) or solid wood ( i know marshall makes plywood cabs ) but krank and som other brand makes solid wood cabs , one of them i think mahogany but i don't remember the name . second question :

leave the dimensions as they are or oversize it ( i.e. 10 % in each direction , or just make it deeper ? )

question 3 :

what speakers should i put in that - here again cash is important , and i don't want to put there vintage 30's because it should be cheap ;p

i consider either

celestions g12 100 t ( it's almost the same as 100 h right ? )

seventy 80's ?

or some kind of eminences

ah and they should be 16 ohm [img]images/icons/smile.gif[/img]

[Dreamland_Rebel]

Re: building a 4x12 cabinet ?

i would go with military grade birch ply. with dovetail (or finger) joints. (this is what boogie uses) and ply would be cheaper that solid wood.

i would leave the cab dimentions the same as the marshall for it is a time tested design.

i would wire it to be an 8ohm cab so if you built 2 of them they would run your head at 4 ohms.

i would go with vintage 30's but since you already have 2 of another kind, why don't you seal the bottom and leave the top half open back with the higher watt speakers. (kind of like the older boogie cabs.)and put some v30's enclosed on the bottom.

jmo
~JW

[skarhead]

Re: building a 4x12 cabinet ?

(...) leave the top half open back with the higher watt speakers. (kind of like the older boogie cabs.)and put some v30's enclosed on the bottom

<font size="2" face="Verdana, Helvetica, sans-serif">-it should be CLOSED BACK (forgot to mention )

i don't have cash currently to buy a pair of v 30 , i can get now g12t 75 , cheaper and those types i said ... ( yup it sucks but cash's a prob :S )


i would wire it to be an 8ohm cab so if you built 2 of them they would run your head at 4 ohms.
- okay first of all i know exactly nothing about wiring , electronics etc ... i can hardly solder a cable ;p , the electro work is going to be made by one of my buddies. u mean 2 cabs ? no i want a single 4x12

the speakers have 16 ohm written on their backs . will it work then ? [img]images/icons/tongue.gif[/img]

so out of those 4 types eminences , seventy 80 ( 16 ohm so it will be ok ) , g12 100 t ( much low end just like the 100 h ) , or g 12 75 but i don't know if i could get them anytime at this price i'm thinking about ...

so more probably one of the first 3 .

the sev 80's have a good rep for such cheap speakers ( for metal ) , so i thought about them .

[zeegler]

Re: building a 4x12 cabinet ?

Plywood is also stronger than solid wood too. Get decent stuff though, not cheapo SPF plywood. I'm using 3/4" GBS 11 ply birch.

[Dreamland_Rebel]

Re: building a 4x12 cabinet ?

you can do parralel wiring or series parralel... there's a way to wire it so it's an 8ohm total load.

well if you build it solid you can always put v30's in it later...


~JW

[data187]

Re: building a 4x12 cabinet ?

you can try using mdf boards to build your cab.
they are cheap and is commonly used for automotive audio purposes.

you should check out the specs for the speakers and see how much space each speaker needs. that will make sure that your speakers are in their optimal enviorment and operate as efficently as they can.

[Black Mariah]

Re: building a 4x12 cabinet ?

DO NOT under any circumstances use chipboard, cheap plywood, or MDF. MDF is fine for speakers that won't be moved much (such as home theatre setups), but it isn't good for anything that's going to be moving around a lot. A dumbass I know tried to build a 2x15 out of chipboard. *DUMBASS*

Dovetail joints aren't neccesary. A simple rabbet joint will suffice, especially if it's braced on the inside as well. As for dimensions, just go with what you need. Consider all the variable involved. Do you have limited space where it will be most of the time? Do you gig, and if so what kind of transport do you use?

The best thing to do is find a cabinet that you like the looks of and work from there.

[skarhead]

Re: building a 4x12 cabinet ?

okay and what about those speakers ? from those cheapo ones [img]images/icons/wink.gif[/img]

you should check out the specs for the speakers and see how much space each speaker needs

<font size="2" face="Verdana, Helvetica, sans-serif">- is that info available on celestion / eminence webpage ?

all of those should work in a standard 1960 cab yup ? extending a cab should only add more bass right ?
i also heard you get good results by making a thicker back of the cab.


ok birch ply wood would be ok ?

[zeegler]

Re: building a 4x12 cabinet ?

If you're on a budget, and want some less expensive speakers to start with, check out Madison speakers. I got 4 brand new Madison Symphony G12K85s for $60 off Ebay. Supposedly they are a copy of the Celestion G12K85. I havent had them hooked up yet, but I know some other JCF guys have Madison cabinets with them in.

[achren_git]

Re: building a 4x12 cabinet ?

god, don't use MDF! it'll sound crap & weigh a tonne! 3/4" marine ply or similar, just as has been mentioned, would be best. i'd go with the g12 100t celestions, putting 2 cheap speakers in would just ruin the sound of the cab. i believe the celestion site has some good tips on building cabs

[data187]

Re: building a 4x12 cabinet ?

wow, i didn't know mdf was that bad.... [img]graemlins/laugh.gif[/img]

i wonder if car audio would sound better with a ply box [img]graemlins/scratchhead.gif[/img]

[skarhead]

Re: building a 4x12 cabinet ?

about impedance now :

if there was written 16 ohms so they are only 16 ohms yup ? ( or 8 and 16 ? ) i'm not really familiar with g12 100h's

can i wire a 4x12 cab with 16 ohms speakers to 8 ohms ? or even better 4 ohms ?

i know it's possible to do that with a 2x12 cab with 16 ohm speakers ( source : avatarcabs )

thx for answering my previous answers .

[Black Mariah]

Re: building a 4x12 cabinet ?

Running all of the speakers in paralell will give you 4 ohms, but really 8 is better if you're planning on using another cab at some point. I don't remember the wiring scheme for 8 ohms with 16 ohm speakers. Just off the top of my head it doesn't seem possible, but I'm not very good with ohms.

Don't be afraid to go with speakers that aren't Celestion. I have some Eminence speakers (can't recall the model. Something obscure and cheapass [img]images/icons/grin.gif[/img] ) that sound really nice. Carvin makes some very good speakers too, but I've heard theirs are just rebraned Eminence.

data187: It's still audio in a car. No. I can not even begin to expound upon my hatred for car audio, so I won't. Suffice it to say that no matter how much money you dump into car audio it is still going to sound like car audio.

[dan glover]

Re: building a 4x12 cabinet ?

I built myself a 212 our of MDF, and i have a 412 sitting on top and my head and it holds up fine and sounds pretty good. I am sure other woods might sound a bit better but the difference isn't that big if you can't find the military grade birch.

[quadperson]

Re: building a 4x12 cabinet ?

Another question...I have a Randall RG100SC 212 combo, I am also thinking about building a cab. My question is, if I run another cab, will my amp use it's speakers PLUS the cab, or will it bypass it's own speakers and just power the ext. cab? If so, what's the point of building a 212 cab when essentially that's what I have anyway...confused yet???