The KZ AS10 PRO features 5 Balanced Armature drivers: 22955 Low Frequency BA, 29689 Mid Frequency BA, 31736 High Frequency/Ultra High Frequency Array BA, and 30019 High Frequency BA. Tripowin Zonie is always regarded as the most popular budget upgrade cable for IEMs. But it's not long enough to fit for more complex setups where the audio source is positioned farther away.