 As a result the tonal characteristics of Dörfler & Jörka saxophones are very similar to Keilwerth instruments and share the distinctive Keilwerth sound i.e.have the same "dark", "smoky", "punchy" and "woody" Keilwerth tone colours, compared to the "brighter" and more neutral sound of, say, Yamaha saxophones.Not surprisingly, it can be very difficult to distinguish the sound of D&J instruments from Keilwerth-manufactured saxophones dating from the same time period e.g.