Nouns

(n)intensity, strength, intensity levelthe amount of energy transmitted (as by acoustic or electromagnetic radiation)“he adjusted the intensity of the sound”, “they measured the station's signal strength”
(n)intensity, intensivenesshigh level or degree; the property of being intense
(n)volume, loudness, intensitythe magnitude of sound (usually in a specified direction)“the kids played their music at full volume”
(n)saturation, chroma, intensity, vividnesschromatic purity: freedom from dilution with white and hence vivid in hue