https://www.audioreviews.org/guide-to-iem-silicone-eartips/#S
SpinFit OMNI
Bore size: tampered, narrow to wide
Stem length: regular, with dual layered core design
Feel: soft and flexible
Bass: 3.50
Midrange: 5.00
Treble: 4.50
Soundstage: 4.25
Vocal presence: 5.00
SpinFit OMNI is the direct successor to the CP-360, with a longer nozzle stem and the distinction of being the first SpinFit product to offer “in-between” sizes, which are common among eartip brands such as JVC Spiral Dot and Azla SednaEarFit.
Compared to the CP-360, the OMNI delivers a thumpier bass response with heavier note weight, forward vocals with good clarity, and treble extension that is slightly less pronounced.
Compared to the W1, the OMNI has a shallower fit and does not provide as good of an ear seal. The low end of the W1 is also more substantial. However, the OMNI offers better vocal clarity, cleaner and crispier highs, and a slightly deeper soundstage.
TAKE NOTE: OMNI will not fit nozzle diameter larger than 5.5mm.