[Navyblue]

Both cost about the same. One is a standard tuned 3 driver custom IEM designed from ground up, another is a 6 driver IEM custom tuned IEM.

I have a Westone 3 that I can sacrifice. Frankly, I thought it (and pretty much all other multi drivers top universal) sounded really veiled and not hifi. However the single driver ER-4 and EX1000 sounded rather good. I pretty much gave up on the multi drivesr BA IEMs, I wonder if cheaper customs or adding drivers to universal IEM is better.

 

[whitefroded]

How do you add 3 drivers to a universal?

 

[Navyblue]

Some companies, like Rooth, let you to add more drivers while custom shelling a universal IEM. And I assume the crossover would be reconstructed as well.