Haha, imagine a few months later, I look back at this and feel like I was just talking out of my arse.

Since I have a much better measurement system now, I have been measuring and observing the effects. So far, I've found spectrogram graphs to give a more complete picture into what's happening at lower frequencies.

-----

For instance, let's inspect the spectrogram of Code-X:



Notice how 80Hz has amazingly fast decay in Code-X? This is audible to me as amazingly fast and snappy drum hits that allows the drum in Eagles' Hotel California - Hell Freezes Over (K2HD version) to actually sound like "drum hit".

Let's inspect the Abyss now:



Bigger red region is due to an FR notch at upper sub bass and lower mid bass that gives a sense of authority and body/thud. In practice, Abyss also has a small region right above 100Hz that has amazingly fast decay. Any song that has bass in this region will sound insanely "fast" with the Abyss here, but overall, Abyss just has a greater sense of body/impact compared to many other headphones.

Now let's take a look at my LCD-2: (haha, ignore the settings window! Unless you wanna reproduce my graphs)



It has good bass definition (yellow region is fairly small), but I think the green region trails off a bit too far, almost twice as long as Code-X and Abyss comparatively. Subjectively, this means the LCD-2 does sound very very slow, bloated, full down there. It's much blurrier compared to the other 2 headphones.

Then... I did some acoustic mods to it and achieved this:



It's much better than how it was before. Mid bass is still not as clean/clear as either Abyss or Code-X, and that contributes to a slightly blurrier bass impact, but it does have fairly decent body and thud in comparison to the Code-X, which can sound... kinda bass-light in comparison.