16 ohms, 8ohms, 4ohms.........help understanding this.

I have a Marshall half-stack. So I just match the ohms correct ?

16 ohms uses the least amount of ohms ?

8 ohms uses middle amount ?

4 uses all the ohms ?

What is the difference betwwen left and right on the plug-ins ?

Line out means ? What do you use on line out ?

Yes you match the ohms.
Say you have a 100 Watt amp that can put out its full capacity in 4 ohm. If you connect a speaker with 8 ohm the 4 ohm jack you can still crank yer amp but it wont be as loud, its a subtle difference though. Same if you connect a 16 ohm speaker, you can crank it but it wont be as loud. Then on the cabs you can either run a cab in 4/16 ohm mono or 8 ohm stereo depending on what type of cab you have.

If you have an amp which have another configuration which is called connecting in parallell
Right output: Main Speaker , Left Output: Extension speaker
This means that you must have have a speaker in the Main Speaker output to use the Extension speaker output.

You can use the Line Out to connect the amp to a PA System or a mixer for recording when you play.

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you can make a 16 ohm stable speaker 'see' 8 or 4 ohms as well by how you wire it. wiring several speakers together parallell or in series can alter their load. you need to see what your amp ohm ratin is and then see what your speaker ratings are. then you have to figure out if they're series or parallell. then you'll know what load they're seeing and exactly how much power you're actually getting.

I also have a marshall half stack, anyways the other parts have been answered already:

What is the difference betwwen left and right on the plug-ins ?
Left and right is only for A full stack, just pick one for a half stack

Line out means ? What do you use on line out ?
Line out is to connect to a recording console or computer. It will by-pass your amplifier, unlike the speaker outs which run directly through the amp, then out.

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Never connect a speaker that has a lower load then the amp this will damage the output transformer.

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