Does the WS 4"s (back phones) and the WS 5's have the same tonal quality?---If not which one is the best in that regard?-------How about the WS 5's versus the Vance muffs--which one of those has the best tonal quality?-------I realize answers can be somewhat varied, depending on a persons hearing, etc.-----but-----what is your answers to those questions?----------Thanks, Del