#1
i know theres probably a thread answering this question and that i should probably already know the answer but i need some help understanding ohms


i have a marshall jcm 900 head that can be set at 8 or 16 ohms...i think

and i play through an orange 2x12 that is 16 ohms and cant be changed...

im getting a orange 4x12 that is also 16ohms..
how would i properly stack those cabs and my head?
i just need a general explanation of how youre supposed to set your ohms to match up
#2
connect the cabs in parallel and set the amp to 16 ohms.
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#3
If it has 2 8 ohm inputs, plug both cabs into those.


Quote by riffmasterjosh
connect the cabs in parallel and set the amp to 16 ohms.


I've never heard of connecting cabs in parallel... you just connect them both to the amp, there's no way to connect the two cabs together.

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Quote by Zugunruhe
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Last edited by Cutlass_253 at Feb 27, 2009,
#4
right now i have my head set on 16(8) ohms
and its going through a the 2x12 (16ohms)and a 4x12 peavey 5150 cab(16ohms)...
there are 2 speaker outputs on the head so i run one speaker cable from the head to the 2x12 and then the 2x12 has an extension output so i run a speaker cable from the 2x12 to the 4x12

i honestly dont know if im doing this right, but i sounds right and is very loud...?


help?
#5
Ok, the right way to power two 16ohm cabs is to put your amp on 8 ohms for both outputs. You can run it on sixteen, but most amp manufacturers don't recommend it.

For some reason, whenever you split the power between two sixteens you need to reduce the ohms to 8. If you run two 8s, you need to reduce the ohms to 4.

Dunlop 535Q Wah, Ibanez TS-9, EHX LBM
Mesa/Boogie Express 5:25
MXR 6-band EQ, Boss NS-2, Boss PS-5, MXR Phase 90, MXR Carbon Copy

GAS: Micro POG



Quote by Zugunruhe
this was the funniest thing ive seen in the pit for weeks.


^about me
Last edited by Cutlass_253 at Feb 27, 2009,
#6
i see ,so should i be running a speaker cable from the head to the 2x12 and one from the head to the 4x12 or is the way i have it acceptable? is that "parallel"?
Last edited by attheian at Feb 27, 2009,
#7
Um, I've never really heard it referred to in that way. You wire speakers either in series or in parallel, which affects the ohmage, but cabs are pretty straight forward to wire. One cable for each cab runs from the head, that's the right way to do it.

http://www.marshallamps.com/support/support_faq.asp#12b

this should help.

Dunlop 535Q Wah, Ibanez TS-9, EHX LBM
Mesa/Boogie Express 5:25
MXR 6-band EQ, Boss NS-2, Boss PS-5, MXR Phase 90, MXR Carbon Copy

GAS: Micro POG



Quote by Zugunruhe
this was the funniest thing ive seen in the pit for weeks.


^about me