Short answer
Both are Bluetooth receivers, both at $199.
The Shanling UP6 reaches 100 dB on 566 of the 567 models here, the FiiO BTR7 on 565.
| Specification | FiiO BTR7 | Shanling UP6 |
|---|---|---|
| Power into 32Ω | 160 mW | 626 mW |
| Power into 150Ω | 35 mW | 134 mW |
| Power into 300Ω | 18 mW | 67 mW |
| Power into 600Ω | 9.0 mW | 33 mW |
| Output impedance | 1.2 Ω | not published |
| Output noise | 3.0 µV | not published |
| Price | $199 | $199 |
| Headphones it reaches 100 dB on out of 567 | 565 | 566 |
Not published means the maker leaves it out, so that axis cannot be compared.
| Balanced | FiiO BTR7 | Shanling UP6 |
|---|---|---|
| Socket | 4.4mm | no separate rating |
| Power into 32Ω | 320 mW | — |
| Power into 300Ω | 40 mW | — |
| Output impedance | 2.8 Ω | — |
| Output noise | 5.5 µV | — |
| Headphones it reaches 100 dB on out of 567 | 565 | — |
Only the FiiO BTR7 has a separate balanced rating from its maker; through it, it reaches 100 dB on 565 of the 567 models here. The Shanling UP6 may still have a balanced socket — its spec sheet simply gives no figure for one, so there is nothing to put beside it.
| Load | FiiO BTR7 | Shanling UP6 |
|---|---|---|
| 32 Ω | Published | Published |
| 150 Ω | Derived | Derived |
| 300 Ω | Published | Derived |
| 600 Ω | Derived | Derived |
Both makers publish a power rating. FiiO BTR7 publishes at 32 Ω and at 300 Ω; Shanling UP6 at 32 Ω. The other rows are worked out from those.
So the two columns are not equally firm row by row: at 300 Ω only the FiiO BTR7 figure is the maker’s own. On those rows the derived number is the one to doubt first.
1 headphone reaches 100 dB on the Shanling UP6 but not on the FiiO BTR7 — Moondrop PARA.
565 of the 567 models here reach 100 dB on both.
Headroom is at a 100 dB SPL peak.
The widest gap on the list is the HiFiMAN Susvara: Shanling UP6 has +8 dB of headroom there against +2 dB. 6 dB is about 3.9 times the power, which matters for peaks rather than for how loud the music sits.
The hiss columns are empty for Shanling UP6 because that maker publishes no output noise figure.
| Headphone | Impedance | Needs | FiiO BTR7 headroom | Shanling UP6 headroom | FiiO BTR7 hiss | Shanling UP6 hiss |
|---|---|---|---|---|---|---|
| Shure SE846 | 9 Ω | 0.04 mW | +34 dB damping | +36 dB | 24 dB | not published |
| Campfire Audio Andromeda 2020 | 9 Ω | 4.0 mW | +14 dB damping | +16 dB | 4 dB | not published |
| Audeze LCD-2 Classic | 70 Ω | 0.79 mW | +20 dB | +26 dB | 2 dB | not published |
| Beyerdynamic DT 1990 Pro (250Ω) | 250 Ω | 0.63 mW | +15 dB | +21 dB | -2 dB | not published |
| HiFiMAN HE400se | 25 Ω | 7.9 mW | +13 dB | +18 dB | -3 dB | not published |
| Audio-Technica ATH-R70X | 470 Ω | 1.6 mW | +9 dB | +14 dB | -9 dB | not published |
| Sennheiser HD 600 | 300 Ω | 6.6 mW | +4 dB | +10 dB | -13 dB | not published |
| HiFiMAN Susvara | 60 Ω | 50 mW | +2 dB | +8 dB | -15 dB | not published |
These two cost the same, $199, so price settles nothing. Out of the 567 models here, the Shanling UP6 drives one model to 100 dB — and on the other side there is no such advantage at all.
Only published figures count here; blank axes are counted separately.
Each in full: FiiO BTR7 and Shanling UP6.