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i was just wondering if i could ever buy like a marshall cab and run it with my mesa mark IV. I am not sure why i would want to the thing is killer loud now but i was wondering if i could set that combo on the cab hook em up turn all the way up and see how long it takes the police to arrive to arrest me for disturbing the peace. Well thinks for the help.
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Originally Posted by wesley7777 i was just wondering if i could ever buy like a marshall cab and run it with my mesa mark IV. I am not sure why i would want to the thing is killer loud now but i was wondering if i could set that combo on the cab hook em up turn all the way up and see how long it takes the police to arrive to arrest me for disturbing the peace. Well thinks for the help.
Yeah. The easiest way is if you have a 'speaker out' jack. Connect the speaker out with a cab with a speaker cable (make sure you match impedance on the cab and amp). For guitar, the most popular is 8 ohms, but 16 ohms exists, and I've even seen 4 ohms. Some amps may even have a switch (more prominent with heads) to select an impedance. Mismatching impedance can cause damage, although a sure-fire way to damage an amp is to run it without a speaker hooked up. When the speaker out is used, the internal speaker is disconnected, so make sure the cab is hooked up before the amp is fired up, and turn it off before you disconnect.
If there is no 'speaker out', the leads going to the speaker can be taken off and run into a speaker cable to plug into a cab... again, make sure it is all set up correctly before you would power up.
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Speaking of this, on my amp it has an impedance selector switch (4/8/16) and two speaker outs. How does the switch affect the outs? (i.e. Does switching the switch to 4 make both outs 4 ohms?) And if I have speakers attatched to both outs, would they be electrically connected so to cause the combined ohm-rating to have to be used? I'd guess no, but I'd rather be sure.
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Originally Posted by Rainer. Speaking of this, on my amp it has an impedance selector switch (4/8/16) and two speaker outs. How does the switch affect the outs? (i.e. Does switching the switch to 4 make both outs 4 ohms?) And if I have speakers attatched to both outs, would they be electrically connected so to cause the combined ohm-rating to have to be used? I'd guess no, but I'd rather be sure.
hmm... I think that the impedance selector is for the overall selection (as though 1 jack was used). There isn't any way (at least nothing easy) to be able to make it so that you could use the 8 ohm selection work correctly for use of one 8 ohm cab and also be able to be used for two 8 ohm cabs... I'm thinking it is an overall selection, and I'm also thinking that the jacks would be wired in parallel (I guess they could be done in serial, but not likely).
So, I'll try to make this as simple as I can. If you use one jack, it should be set to the same switch as the impedance of the cab. When a second is plugged in, another resistance is added to the circuit. When adding a resistance to an already existing resistance (either series or parallel), the equivalent resistance will change. When in series, they simply add together. When putting them in parallel, they effectively cut in half (assuming same resistance (ohms)). So, two 8 ohm speakers in series would be equivalent to 16 ohms, and two 8 ohm speakers in parallel is equivalent to 4 ohms. (I could draw up some stuff if you don't understand this... just ask and I'll be happy to.)
So, I'm assuming that the selector is for the overall resistance, and I'm also assuming that the jacks are wired to go in parallel, so when you use both jacks with cabs of the same ohm rating, you would want to select the impedance that is half of the original. When using just the one jack, simply select the impedance of the cab.
Your best bet would be find a manual (if you can find one), contacting the manufacturer, or the schematic might shed more light on it...
or you could wait for Major Tom...
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Some combos have two different outs, one that mutes the internal speakers and one that doesnt. At least my amp has that. So you could use it like a head if you really wanted to instead.
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Looking at the schematic, it looks like they're wired in parallel.
Thank you, the impedance changes was what I needed to know.
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well all my amp Is a place that says speakers and has a place for 8,4,4 ohms right next to each other, with the speaker plugged into 8, could i get a cab and plug into on of the other 4 ohms slots. THe others things are slave out, and satelite. NOw i know you can put extension cabs on these amps because if you look at mesaboogie.com it shows combos with cabs. Man am i uneducated about cabs.
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Originally Posted by wesley7777 well all my amp Is a place that says speakers and has a place for 8,4,4 ohms right next to each other, with the speaker plugged into 8, could i get a cab and plug into on of the other 4 ohms slots. THe others things are slave out, and satelite. NOw i know you can put extension cabs on these amps because if you look at mesaboogie.com it shows combos with cabs. Man am i uneducated about cabs.
Do you have a manual to refer to? And what is the amp model?
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oh its a mark IV, and yeah i have a manuel, i was just hoping that reading the instructions would be a last hope. Remember i am a man i don't need instrutions.
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i may be a nerd and a geek, but i always ead the instructions...
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Originally Posted by What5647 i may be a nerd and a geek, but i always ead the instructions... i would never "ead" an instructions book that could be painful.
oh i am reading it know
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LOL! whoops. yes, my typeing stinks. (that and my keyboard is getting dirty, not all keys work...)
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and so does my spelling....
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I think I know how your mark IV is setup. What you wanna do is find a cab w/ 8ohm impedance, unhook the stock speaker already in the combo and plug the cab into the 8ohm jack that the stock speaker was plugged into.
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yeah but i really want to be able to run the speaker in the combo at the same time. It said in the book that the two 4ohms slots are really running parallel so plugging in 8 ohms is like plugging in 4 and it aid that is was ok to mix match ohms with my amp specily if there is a 16 ohm cab it would work fine. but i am still confused it talked like you have to plug in a speaker into both the slots to work. Sorry if that confused you.