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Great pair of Knowles Zenit IEMS. I believe it's one of the best KZ headphones. The 6MM High Performance Dynamic Driver, responsible for the bass, does a very good job. I initially had some concerns that it might not move enough air, but that was unfounded. The bass is deep, punchy, and really rumbles. The 13.2 MM Planar Driver, which is responsible for the rest of the frequency spectrum, beautifully complements the mids and highs, as we already know from the PR3. With a slight mid and high extension and an extension of the bass, the Symphony sounds very balanced and crystal clear. The timbre is comparable to the CCA Hydro and Rapsody or KZ ZS 12 Pro X. However, due to the open design, it sounds much airier and clearer than the CCAs. I can highly recommend the Symphony.
super klang, danke