Effect Audio Cadmus is an easy upgrade I can genuinely recommend. In my chain, especially with a very warm, bass-heavy IEM like Campfire Audio Dark Star, it helps the sound come across less "dark" by improving clarity and separation without taking away the low-end impact. Bass remains deep and authoritative, but feels tighter with better layering and cleaner decay. Vocals gain a more defined outline, and the stage feels a bit more open and organized. To my ears, the change is more about a general lift in perceived resolution and control than a dramatic tonal re-shape.
ConX/TermX is also a huge quality-of-life win: swapping connectors and terminations is quick and reliable, and it makes one cable genuinely usable across multiple IEMs and sources. Build quality feels appropriately premium, with a UP-OCC silver-plated copper Litz design, flexible insulation, and solid hardware. I also find it comfortable for longer sessions, with good pliability and minimal cable memory.
The Cadmus has a relatively low price compared to most Effect Audio cables. It’s not quite as full sounding as the Eros S, but it is $100 cheaper. I can recommended it for your first upgraded headphone cable. I find them to be very effective with the Sennheiser IE 600s. I bought the Eros, but the thick wires over the ear gave me some of the same issues I had with the stock wire, unseating the tips and affecting the sound. If you are looking to replace the cables on your IE600/900’s I can recommend these. They also did improve the sound quality on my Campfire Audio IEM’s over the Timestream cables that they came with.
This is an excellent article on NPR.
https://www.npr.org/sections/therecord/2015/06/02/411473508/how-well-can-you-hear-audio-quality
How you do with what’s presented will confirm whether or not buying a new cable is worth it to you.
Love these cables, feel look & sound very premium


