Why write that there is not enough volume or frequency range? With an impedance of 24 ohms, headphones will not work well with all mobile devices, this must be taken into account. Yes, and the cone diameter is 30 mm . And who needs it louder and better - clean your ears! The sound of the headphones is excellent for its class - soft, fluffy bottoms, transparent highs, well-readable mids, frequency response without dips. There are no complaints about the ear pads and the design as a whole, it is done to last. I recommend!
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