Noise isolation tells the clearest story in this category. The JBL Endurance Peak 4 offers both active noise cancellation (ANC) and passive noise reduction — a combination that meaningfully cuts out environmental noise at multiple levels. ANC uses microphones to electronically cancel incoming sound waves, while passive reduction comes from the physical in-ear seal. The Shokz OpenFit 2 Plus, by contrast, has neither — a direct consequence of its open-ear architecture, which by design lets ambient sound through. This is not a flaw for Shokz's intended audience, but for anyone wanting focused listening in noisy environments like commutes or gyms, the JBL has a structural advantage here.
Driver size is where the Shokz pushes back. Its 17.3 mm driver is substantially larger than the JBL's 10 mm unit. Larger drivers generally move more air, which can translate to fuller low-end presence and a wider soundstage — though driver size alone does not guarantee superior output quality. Given that the Shokz cannot rely on ear-canal acoustics to reinforce bass (as open-ear designs vent sound freely), the oversized driver is likely compensating for that physical handicap. Both products share an identical frequency range of 20 Hz to 20,000 Hz, covering the full span of human hearing on paper.
Spatial audio support tips the scales further toward the JBL. The Endurance Peak 4 supports spatial audio, adding a three-dimensional sound field that benefits music and especially video content, while the OpenFit 2 Plus does not. Neither product includes Dolby Atmos or Dirac Virtuo processing. On balance, the JBL Endurance Peak 4 holds a clear sound quality edge for traditional listening scenarios, with ANC, passive isolation, and spatial audio all absent from the Shokz — though the OpenFit 2 Plus compensates partially with a larger driver tuned to overcome its open-ear limitations.