• 1MORE
  • Closed-back design
  • 40mm graphene dynamic driver, ceramic tweeter, and bass reflector
  • Rotating anodized aluminum alloy ear cups
  • Adjustable cushioned leather stainless steel headband
  • Cushioned leather ear pads
  • Impedance: 32 ohms
  • Sensitivity: 104 dB
  • Frequency response: 20–40,000 Hz
  • Maximum power: 50 mW
  • 4.4 ft (1.35 m) removable oxygen-free-copper wire with Kevlar core
  • ⅛ in (3.5 mm) gold-plated plug
  • Weight: 10.3 oz (293 g)

I had got this headphone from Massdrop at 130$ out of curiosity.
It is almost the best bang for the money.

I compared it with Massdrop Empire IEM(1k$) and Stax 009S driven by Carbon amp(8K$).
The front end is Chord Dave, Mscaler, Cocktail Audio X30 server, Sablon digital cables and Synergistic Blue power cables ( The total cost is more than 20k$).

It may sound crazy to drive 130$ headphone with 20k$ system.
But it sounds fast and musical with good details.
When I switch to Empire IEM, it sounds more lively with excellent details.
But when I go back to this 1more headphone I can still enjoy the music.

Stax009S drive by Carbon amp has more nuanced details with natural timber.

But 1 more is not far behind Stax at 1/60th price.

Some people complain that it is not comfortable to wear this but I found it is fine after using IEM for a while.

Law of diminishing return apply heavily to headphone.
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I am a happy 1More IEM user. This company does a great job of providing a Lot of sonic value for the price of their products.
I have their triple driver and quad driver models.

David Pritchard
I agree with David Pritchard that 1More provides very good value products.

Also I am happy with Emprie Zeus IEM, I may  try their triple drive IEM .