Band: opinion spread · Dot: weighted average
Sources split, and the split follows the load and the region. It played loud enough for What Hi-Fi? on a Grado SR325x, and owners find it fine on IEMs and easy headphones. Others needed nearly full volume on a Sennheiser IE 600 or IE 900, and ShortCircuit could not get an HD 800 S or an Abyss to a satisfying level. The volume limit reported on US, UK and EU units runs through the owner threads: 115 Head-Fi authors mention it, and buyers import Japanese units to avoid it.
Measured
Aregina's Sony Korea-funded bench read 0.92 Vrms from the 3.5 mm jack at 0 dBFS, level with the older A105 (0.91 V) and under half the ZX707's balanced 2.14 V, and said it was “similar to a USB type-C adapter for general smartphones”. The unit's region isn't stated. Sony Japan rates 35 mW per channel into 16 Ω. There is no gain switch.
vs. listeners — Sony contradicts itself by market: its US and UK pages print 0.4–1.1 mW at 32 Ω against Japan's 35 mW at 16 Ω. A Head-Fi owner argues the low figure is a misprint of volts, but owners who have tried both call the difference large and r/walkman's accounts describe it as a software limit. Sony doesn't explain it, so the Japan figure can't be assumed for a US or EU unit.
“Where the A306 differs (and has the upper hand) is with volume: it had no problem driving the Grados, and we found it played more than loud enough for our needs.”
What Hi-Fi?
“to get a reasonably good sound pressure level I would have to push the volume to close to a hundred”
Darko Audio, on a Sennheiser IE 600 and IE 900 (the scale runs to 120, volume limiter off)
