Well, IEMs with 2 balanced armatures can already stand up to those with 3 or 4. The PFE232 is a well worthy competitor of the W4 and going to customs like the JH5 or UM marvel can already compete the W4s. 1 dynamic and 1 BA may not necessarily be better, but it could. The AKG K3003 has 2 BAs and 1 dynamic, and they are well above the W4s, even though I don't find them worth it. That being said, IEMs with 1 BA like the ER-4 or FI-BA-SS are more than enough to compete with those with more drivers, with the FI-BA-SS flatting out destroy the W4.
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