Dobrescu George
Reviewer: AudiophileHeaven
Dear friend,
The maximum diameter of FH5 is 6.5mm. It's recommended to choose 5.0mm eartip if you're planning to buy foam eartip and choose 4-6mm eartip if you're planning to buy silicone eartip. Theoretically, the smaller the aperture of the eartip is, the more bass you could get, and the larger the aperture is, the better pitch you could get. PS: For reference only.
Best regards
I also found this to be true, also, larger tips increase soundstage size, at least in my experience.