Ran into the same thing myself, and I am an Engineer. I recently replaced Bennic caps in my speaker crossovers with Dayton Audio Caps. This was first experiment so decided to not go crazy with expensive caps. The crossover had small film caps in parallel with all the Bennic caps. Approximately 10% of the Bennic value. Replacing only the Bennic caps made a noticeable improvement. Further research led to a recommendation to use 0.01uF, 3000VDC poly caps from CDE as bypasses. Pulled all the small bypass caps and installed the 0.01uF. Clarity, resolution and smoothness now wonderful. Hearing detail in familiar tracks that was not discernible previously. Well recorded and mastered live performances simply put the artist in the room. Experiment and listen.