Digital pianos can sound disappointing (thin, tinny, nasal, dull) in live settings, even if they sound great in headphones. That’s often because of stereo piano samples that have mono-compatibility issues: interference between left and right channels causes distorted timbre due to phase cancellation.
I have an earlier (and even earlier) post with measurements that show this happening on my Yamaha CP50. Those measurements can be hard to interpret; I’d prefer one simple measure of how bad these phase issues are so I can make objective comparisons between DPs. One possibility is a phase correlation meter of the kind sometimes found in DAWs and mixers. This is a quick post to share the results of running my Yamaha DP through such a meter.