i have a 100watt combo

i can plug in either the speakers in the combo or i can plug in external speakers
if i put spliters in them and connect to both external and internal speakers will i need to increase the ohm's from 4 to 8

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Ehm, what output is your amp's independance and whats your speaker cab's independance?

you can't change the ohms on most amps, but it does affect the sound and the wattage. more details please...

i not sure of the impedance
but it has two speakers and both plug in to a left and right in the back of the amp if i unplug these and put in a spliter will i be able to connect external speakers to the amp aswell without changing the ohm's

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ah, well yes the ohm of the speakers is important look at the back of the amp or the speakers.

if the ohmage of the speakers is all the same it's no problem, if there's an difference the power the speaker will be giving will be less...

cheers def that helped

im not 100% sure if im getting the speakers yet i just need to find out if i can do it
it says 4 ohm's on the back of the amp
if all the speakers are 4 ohm's does that mean i can plug them in?

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oh yes, that means you can plug them in and your speakers won't lose any power output (like in 8 ohm mode they would provide a different ammount of watts!)

but ehm, the sound might not improve in the high volumes, it depends if you amplifier can handle the extra cabs (like if you have a 30 watt amp and you hook up two 300 watt cabinets, you don't have the power to give the cabs a descent sound feed)

argh, the whole Ohm thing is not my best side, but at least I know how it affects the wattage and stuff... anyways, I'm glad it helped.