Audeze MM-100 vs LCD-S20

The Audeze MM-100 are high-end open-backs, while the Audeze LCD-S20 aren't cheap, but they're not as expensive, closed-backs. The MM-100 offer a flatter sound profile that subtly rolls off the lows like traditional professional studio headphones, but also under-emphasizes the highs. They're much more consistent between wears. On the other hand, the LCD-S20 have a bit more bass in their frequency response while still having a warm treble. Both are very well-built headphones, and it truly depends on what you need them for: the LCD-S20 have the added versatility of closed-backs blocking noise and not leaking much either, but the MM-100's open-back design interacts with your ears more similarly to an angled reference speaker for monitoring.