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Hi, I wanted to share and recommend replacement earpads that I have been using with my GL2 from Massdrop. They are Brainwavz Oval Hybrid Angled Earpads and they fit perfectly tight. The difference is huge (stock pads shown inside in the first photo).
Soundwise:
1. I did notice clear burn in for the first hour or two, later on I wasn't sure whether they sounded better and better or whether I like them more.
2. After that the sound was clearer, less distorted, but too bassy especially in the mid and high bass blending with low mids, while higher spectrum was very scooped. Additionally the pads were not really comfortable. I decided to give it a try. I wanted to retain a fairly good seal while reducing sweatiness and to increase the highs. I must say these pads managed that just about right.
3. The distance from the driver grew larger which gave the sound and soundstage more space. Inherent good channel separation makes it really an immersive experience with the soundstage so deep.
4. The angle on the earpads forces the drivers to be more aligned with the auricle and resulted in louder enough higher frequencies, both mids and trebles. They are not bright by any means, but you don't feel like there is something seriously lacking anymore (probably you might if you are a treble lover, but not a regular listener).
5. The bass having more space and lesser but still decent seal seems far more controlled, still dominating, but not overwhelmingly.
6. The overall final signature is dark with a lot of bass, but not overwhelming in any department, clear mids and highs, and a great soundstage, amazing for a closed-back. The musicality is just perfect, you start to headbang involuntarily to songs you wouldn't think before.
7. They are incredibly forgiving to the source material. This signature reduces any high pitched white noises from poor recordings, and highly compressed modern albums like Metallica's Death Magnetic (which isn't my favourite otherwise) sound incredible (I guess I solved which headphones Rick Rubin used) ! They are easily driven off from a common midrange smartphone, no amp or sth, and little difference pluging them to a decent DAC.
These are now my go to headphones now (compared to Sennehiser's HD58x bought simultaneously and some old Pioneer's). The pads made comfortable. I endorse the combo once more.