1) Brightness 2) Elan 3) Plangency 4) Reverberance 5) Sonority 6) Sonorousness 1) Plangency 2) Quality 3) Resonance 4) Reverberance 5) Ringing 6) Sonority 7) Sonorousness 8) The quality of being resonant 9) Timber 10) Timbre 11) Tone 12) Vigorous quality 
• (n.) The state of being vibrant; resonance.
Vi'bran·cy noun The state of being vibrant; resonance. 
vibrant, vibrancy, vibrantly 1. Pulsing or throbbing with energy or activity: 'the vibrant streets of a big city'. 2. Vigorous, lively, and vital. 3. Exhibiting or characterized by rapid, rhythmic movement back and forth or to and fro; vibrating. 4. Produced as a result of vibration; resonant or resounding: 'They sang the song with vibrant voices...