Originally Posted by Dean Roddey
But isn't a big part of it also the AMP feeding back? I.e. it's seeing it's own signal and reacting to it?
but the amp is not seeing it's "own" signal - it is seeing the signal coming from the pickups
of the guitar which of course are reacting to the strings
which are reacting to the sound
of the amp. It is a feedback loop
. No part of loop is reacting to "itself". Any place you tap off the signal, the feedback will be there. The amp, the speaker, the room.
I don't think the DI of the guitar is any 'different' in this respect just because it is "clean". It is part of the loop.
It is a cycle that flows through the amp and the guitar and back. That's not happening when you play the DI back because you are missing one half of the equation.
yes it is
still happening when you play the DI back, because the volume of the amp was loud enough to get the strings vibrating in the first place. The output of that DI is what the pickups heard: The pickups heard strings that were being excited by the extreme volume of the amplifier.
It sure seems to me that the amp's own circuitry is part of that loop, seeing its own signal and re-amplifying it repeatedly.
But the amp does not
see it's "own" signal again until after
it has excited the strings and then been picked up by the pickups and then sent out the DI. Therefore the strings must be vibrating with the feedback, therefore the DI must contain the feedback as well.
There is no feedback loop that is solely contained within
the amp, unless you had a microphonic tube or something.
I think you would hear a big change in the DI the second you cut power to the amp.
It's hard for me to imagine that if you just recorded the DI from Jimi Hendrix humping a Marshall Stack, and re-amped it that it would sound the same.
It's hard for me to imagine that with the same amp set up
the same it would not
sound the same, well mighty close anyway. The big differences would be in how the reamp box loaded the input of the amp and so on.
Anyway, we don't want to get Aristotelian here and just try to determine it purely on thought. Someone will have to test it.
you are right, of course
I am working and sleeping only
for the next 3 days, but after that....