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RE: Seems to follow accepted theory to me ...

Thank you Dave.

Keeping the low frequency out of the picture keeps the ellipse from being so large (wide) that it drives the signal into the more extremely non-linear parts of the tube's curves, as shown in the green and red of your second graph.

In the end, I think that was all I was trying to say. I also think that is what Voltsecond was saying.

All I know for sure is when I limited the LF going to my SET amp (I already have woofers, driven by a SS amp, handling the bass and my mids don't play bass anyway) the sound of the mids and highs got much better.

I believe the graph above, vs. the other graph you show, is the reason for this.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"


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