in the crossover board?
No, we use top-quality conventional components in all Harbeth circuit boards selected for their actual values, long-term stability, physical size and availability. Conceivably, other alternative components could be substituted by the user but only after very careful evaluation which would necessitate accurate professional measurement equipment. We do not recommend Harbeth users open or modify any part of a Harbeth speaker system because this would invalidate the Warranty. It is very doubtful that the performance could be improved although it could certainly change.