Two categories of audio "improvement" have 95% of all the total audio misrepresentation attached to them. Wires and capacitors. I mainly fiddle with older Klipsch and new speakers I build for myself and have found a couple of things to be true in my world. A conductor of proper size works just fine and the 12 zip cord I use handles 600 seat theater setups with complete fidelity and no loss. Capacitors do get old and the ESR generally is what drifts out of spec over time. I recap all those crossovers now using Audyn red label or Dayton 1% polypropylene caps. Now there are a ton of people who swear by various expensive caps, especially those who sell them and fru fru fancy crossover builds, but the reality is they are adding distortion to flavor things in a way they like. I use neutral good measuring caps and add flavor other ways if I must.
If you liked them when you first got them years ago then caps would be my first suspect for degraded sound today.
If you liked them when you first got them years ago then caps would be my first suspect for degraded sound today.