@JanesJr1 my phone doesn't have a headphone jack, I'm talking about the Hidizs S9 Pro 3.5mm UNBALANCED jack. I didn't get the balanced cables unfortunately so I can't test them but they might have the same issue.
There's very apparent bass degradation before reaching max volume. I strongly suggest A/B comparing bass heavy tracks near full volume on Hidizs against a volume matched desktop headphone amplifier, I think it's very obvious.
I compare against the Topping NX7 headphone amplifier which is measured to deliver 1200mW @16Ω
便携设备 额……这台便携式耳放,是拓品的NX系列(之前我从没测过这个系列)即将推出的新产品。我印象当中拓品的便携就没有特别出彩的=。= (BC系列其实还行)。无论如何,这是 Topping NX7 ,一台自带电池的便携式耳放:
www.l7audiolab.com