If I can clarify something here-
If the speaker was voiced to work with transistors, the smoother impedance curve is going to be a real boon if you are trying to use tubes.
If the speaker is designed for tubes, the impedance curve likely will not matter too much. So both Duke and Trelja are correct as this is an issue that is very use-specific.
for more information see:
http://www.atma-sphere.com/papers/paradigm_paper2.html
If the speaker was voiced to work with transistors, the smoother impedance curve is going to be a real boon if you are trying to use tubes.
If the speaker is designed for tubes, the impedance curve likely will not matter too much. So both Duke and Trelja are correct as this is an issue that is very use-specific.
for more information see:
http://www.atma-sphere.com/papers/paradigm_paper2.html