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Hi it possible to plug 2x12 (1 x12 +1x12 ) 2 input and the same cab .Is better or 2x12 serie is better?My speaker have 8 ohm .
2x8 ohm serie =16 ohm

2 x(1 x12 )2 imput in same cab=8 ohm

You can plug 2 cabinets into a Trinity 18. So you could plug each 8 ohm 1x12 into the amp and set the impedance switch to 4 ohms.
Stew

Better to 2x12 serie? and why 4ohm tank you

Sorry..perhaps I have misunderstood. If you have 2 cabinets and each is 8 ohms, you can plug both into the 18. They will be in parallel now, so 8||8 is 4 ohms. If both speakers are in the same cabinet and and you have the option of individual wiring then the same situation exists if each has it's own jack. If they can be connected in series inside the cabinet then you'd plug into the 18 and set the impedance switch to 16 ohms. As to which is "better"...both are electrically correct and your ears will be the judge.
Stew

Some people like 16 ohms because it 'uses' all the OT windings. I like to build combos at 8 ohms.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Tank i want 8 0hm in 1 cab (2x12) ,i have 2 speaker 1 (8 ohm ) +1 (8.5ohm) . I think it s ok ? the cab have 2 input and the head 2 output join with 2 cable .the head ohm selector select 8 ohm it ok?
Hey tank my english it not so good
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How to optain 8ohm with 2 speaker ? 2 x 4 hom series ?
Tank my cab is ready to rock

You can't make an 8 ohm cabinet with 2 8 ohm speakers. It's going to be 16 in series or 4 in parallel. If you buy two new speakers it'll probably be best to get 2 16's and put them in Parallel. Don't see a lot of 4 ohm speakers.
Stew
PS. You can run a "detuned" cabinet. Put 1 8 ohm speaker in the 2x12 cabinet and leave the other hole open. This only works in a closed back cabinet. Supposed to sound good in a deeper cabinet.

Hey tank i chose to buy 2x16 ohm to make 8 ohm i try a private jack.
I have a another cab question to put a tolex my cab have 29 inch x 24 inch
one piece of tolex not make the contour in 1piece i have 2 yards where you put the join .under the cab? under the top piping?and wath the ideal height my cab have 24 inch.
I try to put some image but not work i dont understand. Jeff

Sorry can't help with tolex.
Stew

No problemo Great tank Jeff

I would put the seam under the bottom of the cabinet.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Hi what the glue do you use to glue the tolex?Carpenter glue is ok ?Contact cement?tank Jeff