Question:
on the back of this amp there is 1 input for using the amp as a combo and its a 8ohm input. then there is 2 inputs for 4 ohms for connnected external speakers. i just bought it from a friend and for the 9 months hes had the 8 ohm speaker was plugged into the 4ohm input. does this harm the amp? or would it only harm it the other way around, like a 4ohm speaker into a 8ohm input?
Answer:
4-->8 should be fine...don't do it the other way or your resistance will be too low and you'll end up blowing up the output transformer...I think.
there was actually a thread on this recently...let me see if i can link you to it...it's a good read
/forum...highlight=ohms
Answer:
Originally Posted by thesteve 4-->8 should be fine...don't do it the other way or your resistance will be too low and you'll end up blowing up the output transformer...I think.
there was actually a thread on this recently...let me see if i can link you to it...it's a good read
/forum...highlight=ohms I know i was reading in my Mesa Book and it says that it is better to match higher than lower. It does not say that it will do any damage if you match low except put more ware on the tubes. But this is my amp not your, so you might use caution
Answer:
Originally Posted by wesley7777 I know i was reading in my Mesa Book and it says that it is better to match higher than lower. It does not say that it will do any damage if you match low except put more ware on the tubes. But this is my amp not your, so you might use caution hmm...interesting...i'd try it out, but output trans are fairly expensive to replace...at least more expensive than i want to pay
Answer:
Originally Posted by thesteve hmm...interesting...i'd try it out, but output trans are fairly expensive to replace...at least more expensive than i want to pay I wen to mesa and download their manuel for the mark for and took a screen shot so you can see what they said.
Answer:
Originally Posted by wesley7777 I wen to mesa and download their manuel for the mark for and took a screen shot so you can see what they said. yeah...the word it very carefully...most manufacturers just say, "don't do it, it's stupid". when it says it'll cause your tubes to burn out faster, what it doesn't tell you is that it once a power tube is gone your transformer is probably next...at least that's my understanding.
Answer:
It's already pretty much been covered . . . but to clarify:
It is definitely best to match the impedance of your speaker/cab to the impedance of your amp. If the speaker impedance is lower you risk damaging the amp. If the speaker imedance is higher you wont damage anything, but you will lose some volume and efficiency.
There may or may not be technical data to back this up, but I think it's especially important to be mindful of this with guitar amps, when you are pushing your output section heavily.