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The speaker membrane is very hard when new, so it is very important to use it scientifically when new. That will affect the performance of the headphones later. I won't argue further, and understand that this will have divided opinions, but don't underestimate someone else's point of view if it...

Even a new car only reaches peak performance after about 6000 km of use. This was even written in the owner's manual when I bought a new car. I have used 2 Sennheiser headphones, one is wired, and one is wireless. I was inherently skeptical about burnin, but my own experience made me believe...

I trust myself.

mmt4 has really great sound quality, especially after going through the burnin process for about 100 to 200 hours (burnin really works). Of course it only reaches its full potential if you have a quality bluetooth music source, aptx adaptive is required.