I love silk eq but I have to admit I rarely use it for the low shelf at 60. that 3 db increment is always a bit too much anywhere from the kick or bass where I would usually use it. maybe I will use it more to remove lows than to add. 60hertz is rarely needed to boost with the stuff I work with.maybe 20, 30, 40 for some sub deepness. or 100 and above to make the bass guitar fuller.. that is my opinion of course.. but the high boosts are awesome when needed. also mid use the mids on my masterbus I just discovered when I boost around 2k on my mix it opens up nicely and it sounds less ITB. I think its because all the other frequency area are sounded nice and are well balanced. no need for extra air or brightness. if needed I will leave that to the mastering guy. and since using nebula I also dont feel the need to add tape plugin on my mixbus. its often too much bass added or it blur the mix more than anything. I guess i'm doing a good job at mixing so I dont need to put millions of processing on my mix and leave it dry and natural for the mastering. just a touch of eq and console emu (just bought that alexb MFC). )))
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Yes it can be heavy on the lows but One thing I love about it is the smile curves. The high boost can be balanced out very well by low boost it seems. The low end is actually around a 40hz boost But it is fairly broad, I guess thats why it sound's like it's higher.
Here is some graphs I had made,
These were to mimic the original 1960's manual
Notice no strange wobbles in the low end!!!! I've attached the original manual if anyone wants to see.