Sri Vidya Mantras (Sri Amritananda - devipuram.com)

Śrī Vidyā is the name of a Hindu religious system devoted to the goddess Lalitā Tripurasundarī or simply Tripurasundarī ('Beautiful Goddess of the Three Cities'). The Sanskrit word vidyā means knowledge or lore; so the literal translation of Śrī Vidyā is Knowledge of the Goddess Śrī.
In the theology of the Śrī Vidyā the goddess is supreme, transcending the cosmos which is a manifestion of her.
The goddess is worshiped in the form of a mystical diagram (Sanskrit: yantra) of nine intersecting triangles, called the śrīcakra that is the central icon of the tradition.
The name śrīvidyā is also used to refer to a specific mantra used in this tradition having fifteen syllables. This mantra is called the pañcadaśī; The Fifteen syllabled; and the pañcadaśākṣarī. She is also worshiped with a mantra of sixteen syllables called the ṣodaśākṣarī by some people. It must also be noted that the ultimate mantra in the system is "Shodashi" having 32 syllables. ...
The underlying principle of the whole practice is to realize the ultimate unity of the Devata, the mantra, the teacher and the practitioner.
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Chanted by a modern-day Seer, Sri Annapoornamba Sameta Sri Amritananda Natha Saraswathy. People fondly refer to him as Guruji.
Video text also from his website:
www.devipuram.com
Additional credits at the end of the video.