Kenny,
That's my point when I say we don't know what we don't know. One, we must have an open mind to try different things to listen to and let our ears determine if there is an improvement worthy of the cost. Two, we need access to different equipment without obligation to purchase. The 2nd part can be very difficult. I submit there is always an opportunity to improve, but not always feasible. At some point I hope I just accept my system as it is.