Brandon -
Our standard crossover parts are Solen caps, Mills/Vishay resistors, and air core inductors. All crossovers are point-to-point hand-wired - no PCB boards. Customers have always had the option to upgrade parts such as capacitors. We have done many custom crossovers over the years. Since we manufacture the speakers, we have an opportunity to do something no customer can do. We can compare speakers with our standard crossovers with speakers with "upgraded" crossovers, side-by-side in real-time. The differences, if any at all, were minuscule at best. Best of all, the crossovers were designed by Dennis Murphy.
I hope this helps.
- Jim