#1
can a cabinet (4/12) rated at 4 ohm's 80 watts max, be powered with the line out from a 20 watt marshall? will it work or is the ohm rating have to be the same?
#2
which 20 watt marshall. and yes ohms have to match up, depending on how you wired it, parallel or series, i believe.
#4
if the speaker on your combo amp is wired for 8 ohm and the cabinet is 8 ohm wired, then you're good to go.

worst case scenario rewire the speaker connections to achieve 4 or 16 ohm. it's actually simple to understand how it works if you needed to do that.
STUFFZ:
SAGA ST10, IBANEZ(s): '96 ZR140BK (korea), '96 RX20 (indonesia)
Danelectro Cool Cat CC1 Chorus
Digitech Bad Monkey
Behringer BX1800A (180w 12" aluminum cone)
FOR SALE: Fender Champion 110 (25w RMS combo 10" with tank reverb)
#5
um... thnx. ill check that out, any idea where some info on how to rewire the speaker?
#6
sure.

but you're not rewiring the speaker, but possibly the cabinet. remember, if it's wired for 8 ohms and so is your amp, you don't need to do anything.

Rt = R1 + R2 + R3 + R4 ==== series

Rt = 1/R1 + 1/R2 + Rect..... ==== parallel
Rt = R1||R2 is the same

since an 8 ohm speaker has a resistance of 8 ohms, we think of it like it's a resistor. (because it is resisting current to some extent)

two four ohm speakers in series is 8 ohms. two eight ohm speakers in parallel is four ohms. two sets of 16 ohm speakers, each in series, but in parallel to eachother, is 16 ohms.

(16||16) + (16||16) = 16 ect.
STUFFZ:
SAGA ST10, IBANEZ(s): '96 ZR140BK (korea), '96 RX20 (indonesia)
Danelectro Cool Cat CC1 Chorus
Digitech Bad Monkey
Behringer BX1800A (180w 12" aluminum cone)
FOR SALE: Fender Champion 110 (25w RMS combo 10" with tank reverb)
#7
You can mismatch impedances as long as you aren't putting a lot of power through it. But I will say that adding a cabinet like that won't end up making it that much louder anyways.
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#8
Quote by loco1rocker
can a cabinet (4/12) rated at 4 ohm's 80 watts max, be powered with the line out from a 20 watt marshall? will it work or is the ohm rating have to be the same?
No.
A line out is intended to drive a recorder, or another amplifier.
It won't drive a speaker properly.

It's not the same as an output for an external speaker.
Meadows
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#10
of course, SYK is right, i skimmed over the tiniest detail. you cant power a cab with just another output unfortunately. but they are good for recording, as syk said.

and syk, your sig DOES tell the truth
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