Equalizer has always been set to "Normal" and I did reset several times. 68 volume was with bluetooth output (I was using Kailuhong S128 bluetooth earbud, which has AptX and is current sold on Amazon for $15.99, havinig a surprisingly good sound with its 10mm driver. But it has channels...

More information: I tried several earbud: IMR-R1, Audezee iSine20, Hifiman R600, KZ AS16, Apple Earbud, all on 3.5 port, some on 4.4 as well. All sound similar, very low volume. Playing vocal seems revealed more: guitar or pianos are very forward and sound fine, but voice sounds deep behind and...

My M200 sounds very good, full and warm, on bluetooth AptX at volume 68. But the volume is very low with headphone jack, both 3.5 and 4.4, even at the max (150?) still not as loud as bluetooth at less than 50% of the max volume. Also the sound signature is very different from bluetooth, somewhat...

I had a pair of Sennheiser MM 450 for several years but listened mostly in wireless and noise cancellation mode. Noise cancellation is acceptable and sound is better than most wireless headphones. But I recently tried it with wires connected to a small headphone amp. Much to my surprise the...