TRN Xuanwu (Bellsing SPD + Bellsing tweeter BA) purchased at $24 from TRN official aliexpress.
It comes with TRN T-tips (M)! Nice.
▶︎To my experience planar drivers are less sensitive to burn-in and this Bellsing SPD seems following the same traits
Sound Impression:
▶︎tonal balance wise it’s V-shaped. The TRN-V we know very well, and first thing I noticed is it sounds very fast! Wow, Bellsing has done a good job for SPD!
▶︎What I don’t like is the well known Bellsing BA-tweeter timbre, is very present. I think the BA tweeter is located very close to the nozzle outlet… KZ tackled with BA timbre by intentionally drop 4-6khz by jaw dropping 10db on new ZS5, but TRN says “no, we don’t want to dip! “ . You can see coupler’s internal resonance peak at 8khz is noticeably higher than other IEMs, it indicates the BA tweeter location is either in the nozzle or Pretty close. Even N5005 suffers from this BA timbre with several ways to deal with, TRN took imaging projection over timbre.
I may try some treble tame ear tips, as well as some cable roll to tune Xuanwu. Stock tuning is a bit too much for my preferred ones.
Overall I’m quite impressed with Bellsing’s Square Planar, maybe in the future we could see some better implementations with different tweeter combinations. SPD is a thing that sounds very planar and enjoyable, another Bellsing’s effort that crystalized.
Some FR cross comparison, HEXA as reference tuning.