Efficient implmentation of dynamic EQ? – Effects Forum

is there any well-known efficient implementation of a dynamic EQ?

What I mean by this is that the filter coefficients do not have to be recalculated with every sample.

For example, for the positive part of the peak filter, one can construct the filter using two terms where the gain controls the amplitude of one term. In this case you don’t have to calculate any filter per sample at all.

But for the negative part it seems impossible, also for other filter types like shelfs.
Am I wrong?