killemall8 Posted September 21, 2008 Report Share Posted September 21, 2008 i know nothing of amps. you all should know this by now. but my question is... if a combo amp has alll of the line outs and such, can you use the combo as a head and run it with a cab? (waiting while being embarrassed) Quote Link to comment Share on other sites More sharing options...
killemall8 Posted September 21, 2008 Author Report Share Posted September 21, 2008 c'mon guys. Quote Link to comment Share on other sites More sharing options...
westhemann Posted September 21, 2008 Report Share Posted September 21, 2008 Impatient much? Yes...as long as it has a speaker output. Quote Link to comment Share on other sites More sharing options...
Sami Ghouri Posted September 21, 2008 Report Share Posted September 21, 2008 that depends on the amp itself. Some amps (like my behringer LX112) can completely act as a head disconnecting the internal speaker and running full force into a cab. But you have to make sure you have the SPEAKER outs in the back, not lineouts.... i think most marshalls do have that stuff too.... some line6 as well.... Quote Link to comment Share on other sites More sharing options...
bluesy Posted September 21, 2008 Report Share Posted September 21, 2008 It is the simplest of mods to add a switched speaker output to a combo amp (If it doesn't already have one). The main requirement is that the cabinet load is appropriate for the amp. Obviously a cabinet of the same impedance as the internal speaker(s) is fine, as it replaces the internal speakers (which get switched out) with an identical load, so the amp is happy. A lot of transistor amps just have a minimum impedance into which they are safe to use. Higher impedances are safe, but mean you'll get less power from the amp (all other things, such as speaker efficiencies being equal). Valve (tube) amps are more critical and need the correct load for the output transformer. Some have transformer taps to allow other loads as well. Quote Link to comment Share on other sites More sharing options...
killemall8 Posted September 21, 2008 Author Report Share Posted September 21, 2008 how do you add a speaker output? Quote Link to comment Share on other sites More sharing options...
bluesy Posted September 22, 2008 Report Share Posted September 22, 2008 how do you add a speaker output? You get an output socket that has a switch built into it (they are commonly available). They have 3 terminals. You remove the 2 wires that go internally from the amp to your combo amp's internal speaker(s) and wire them to the new output socket instead. You then add 2 wires from the output socket back to your amp's internal speakers, but one of them comes from the output jack's switch (the 3rd terminal). The other wire is just commoned, i.e. joined to the same terminal as the original wire coming from the amp. What happens is that, when nothing is plugged into the socket (i.e. no external cabinet) the switch is closed, and so your internal speakers are connect as normal. When an external cabinet is plugged in, the switch opens, thus disconnecting the internal speakers, and connecting the external cabinet instead. Quote Link to comment Share on other sites More sharing options...
killemall8 Posted September 22, 2008 Author Report Share Posted September 22, 2008 thanks, but im going to forget about it. i could no way do that. Quote Link to comment Share on other sites More sharing options...
bluesy Posted September 22, 2008 Report Share Posted September 22, 2008 thanks, but im going to forget about it. i could no way do that. I'm sure you could get someone to do it cheaply. I'd do it for a bottle of cheap Scotch 'cept I suspect I'm too far away down here. Quote Link to comment Share on other sites More sharing options...
killemall8 Posted September 22, 2008 Author Report Share Posted September 22, 2008 depends, where are ya? plus, im not old enough to buy alcohol anyway. Quote Link to comment Share on other sites More sharing options...
bluesy Posted September 22, 2008 Report Share Posted September 22, 2008 depends, where are ya? plus, im not old enough to buy alcohol anyway. oops anyway I am in Australia. Long Way from New Mexico... Quote Link to comment Share on other sites More sharing options...
killemall8 Posted September 22, 2008 Author Report Share Posted September 22, 2008 wow, surprized you knew where NM was. most people here in the states dont even know it exists or is a real state. Quote Link to comment Share on other sites More sharing options...
WezV Posted September 22, 2008 Report Share Posted September 22, 2008 its no more difficult than wiring a stereo jack on a guitar, do you wire your guitars? Quote Link to comment Share on other sites More sharing options...
westhemann Posted September 22, 2008 Report Share Posted September 22, 2008 It really is easy....I have done it on an old amp.... But yeah..an amp tech can do it for a few bucks,rich boy... Quote Link to comment Share on other sites More sharing options...
killemall8 Posted September 22, 2008 Author Report Share Posted September 22, 2008 yeah i wire my own guitars. but i dont know anything about amp wireing. i dont know which is which or even where they go. and once again wes, whatever. Quote Link to comment Share on other sites More sharing options...
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