I was trying to show some restraint and not respond so quickly regarding the Legend X. I have only had the Solaris for a few days and I have had the X since release. I truly chuckle at the impressions of how boomy the bass is on the X. The X is one of the most technically proficient IEMs I have heard. I always caution folks about quick listens and impressions. I have had the X for close to a year, I guess, and still haven't written my review. The X does have an overall more bassy overtone than the Solaris. One song I really like to use to evaluate IEMs is the FLAC version of YYZ.
The X has changed for the better, just as has my well seasoned Atlas.
Using YYZ as the measure, the bass will be the first thing to strike you, it is more present with the X vs. Solaris. Overall the tone is more bassy with the X. The Solaris appears more balanced. The bass strikes hard and fast with the Solaris with quicker decay than the X. The mids are more present in the Solaris but they are tuned to display differently than the X, which are not interfered with by the bass, as some have stated. The treble extends very well in both, but is more present in the Solaris. Over the clarity and definition is greater in the Solaris but the timbre and tone of the X is right on. The X is less sharp and intense, with more rumble, the Solaris more crisp, airy and defined. Each compliment one another so well. I have listened to YYZ six times with each IEM as I write this. Y'all worked me for these impressions
A tale of two different signatures. I love both, but understand I have had the X for almost a year and the Solaris for a few days, I am sure change is imminent with the Solaris.