The main difference is in the tone.
- The K688 is more on the high and mid.
- Tank3 is the most neutral-sounding one among the three.
- The AM8 sounds most like traditional dynamic microphones with a lot more bass.
In real-world use, each mic suits a different need. If you want good background control without an overly bassy voice, the K688 is a solid choice. The AM8 offers stronger noise rejection for very loud spaces, like gaming rooms. Meanwhile, the Tank3 works well for a wider range of voices, avoiding muddiness or harshness.
Beyond sound, design, and build quality may also influence your choice. The AM8 stands out with its square shape and RGB lighting, while the Tank3 takes the opposite approach with a compact, all-metal body that’s even one-third heavier than the K688.