As the amp output impedance goes up, the frequency output tends to track the speaker impedance more. That is, the frequency output looks like the impedance curve, instead of the original curve of the speaker.
As a result of this, a tube amp can be "tuned" by the speaker load.
Sometimes this is good, sometimes it is bad.
As a result of this, a tube amp can be "tuned" by the speaker load.
Sometimes this is good, sometimes it is bad.