Originally Posted by ClieOS
Will you still say the same with the below graph?
Actually they are the same graph, only the two FR curve are centered differently (one on 500Hz while the other on 20Hz). So which do you think is more correct? Well they both are. RMAA has no concept about absolute reference or calibration, which makes it actually fairly bad for novice who don't know how to read it correctly. With simple EQ, you usually can get away with RMAA because the mid is usually the part that remains the same. But as I said previously, 3D EQ is a different story because of crossfeed, where the mid can get blend out. So don't try to read it as it is because the FR curve doesn't tell the whole story in an 3D EQ. It is like try to x-ray a patient then uses it to speculate about the 3D MRI image. It just doesn't work.
I know about the crossfeed and its "undesirable" changes as the delayed crossfeed signal interferes with the original signal and attenuates specific frequencies usually higher one thus making some dips in the whole FR(Comb filter effect) even changing phase,
that's why you are definitely right that this graph is only a part of the story that the SF switch applies, and its wrong to draw conclusions from it only.
(though reading this graph the reference center point doesn't matter as it is just the behavior that is interesting, its always relative).
Anyway I don't own this amp and I'm just curious to know
What were your impressions (or whomever own it) about its soundstage and instruments separation capabilities without the SF turned on?
How much is the SF switch affect the bass tightness overall, is the effect an actual benefit or more of just a nice gimmick to have?
Edited by ForceMajeure - 2/11/14 at 6:59pm