my research pointed to the fact, that the FXT100 had a rich bass. Yet, the T90 has good bass for me, imho. Do you notice a difference between the FXT200 and the FXT200LTD? I know the cable on the FXT200 is better, but they sound the same right?
The FXT100/200/200LTD have similar thick tonality so those earphones got rid of the fuzzy, harsh treble of the FXT90. But they all have one flaw - they sound congested. One head-fier fixed the issue by removing the nozzle filter. So I got rid of the thick, fibrous filters of all the FXTs to improve the air and its soundstage.
The FXT100 is the most fun-sounding of the three. It has similar sound recipe of the FXT90 with deeper, more impactful bass and relaxed treble. The FXT200 sounds more balanced, more aggressive and forward mid than the FXT100 with more accentuated treble. Though, the 200 is far from being harsh like the FXT90.
The FXT200LTD is an interesting one - it is like the mix of the FXT100 and 200.The LTD is less aggressive, more V-shaped sounding (or distant?), requires more volumes, and it has punchier and deeper bass than the FXT200, but the bass is not as plentiful as the FXT100. The LTD was my favorite, but it got ruined by the stiff, kinky cable that always get in the way, while the non-LTDs have supple, shoe tie-like cables. Using the cable clip is a must.
One important note is that the FXT100 and the FXT200LTD had the soft JVC spiral dots, which fits perfectly. Those were purchased back in 2014. The most recent one I bought, the FXT200 (was purchased around 2017), had a stiff, rigid spiral dots that barely even fits to my ear, and I had a fitting issue with those. So I fit the FXT200 with a JVC's non-spiral dots tips found in many FX earphone lines (e.g. FXT90, FXZ200). I believe the older batches had those nice soft spiral dots while the newer ones had the stiff spiral dots. Therefore, the difference between the FXT200LTD and the FXT200 could be contributed by the different tips I used.
Still, I'd highly recommend getting the FXT100 first then moving forward to the FXT200LTD. If the LTD irked you because of the cable, you might choose getting the FXT200. Or, might just as well pick all those three and enjoy.
Second important note is buying an used FXT100/200/LTDs might be risky. I bought a cheap, used FXT100 for $30 (since I love it) and it sounds like FXT90....I dont know how could that happen.