According to this review, the Harbeth C7c3's should be on 19" stands for their tonal balance and dynamics to "pop." Also, you'll hear different ranges of dynamics depending on everything else--amplification, position, cabling, etc. The review made a point of how dynamic the speaker is until you overdrive it and the dynamics suddenly flatten out.
Woth a read; you might derive a deployment checklist from it.
Woth a read; you might derive a deployment checklist from it.