So the whole thing taking together completely is called the Absolute Truth. The complete whole, or the Supreme Absolute Truth, is therefore the complete Personality of Godhead Śrī Kṛṣṇa. As I have explained, that the manifestation are due to His different energies, and He is the complete whole.
The impersonal Brahman is explained in the Bhagavad-gītā that impersonal Brahman is also subordinate to the complete person. Brahmaṇo 'haṁ pratiṣṭhā (BG 14.27). Impersonal Brahman is also. It is... The impersonal Brahman is more explicitly explained in the Brahma-sūtra as the rays. As there is the rays of the sunshine, sun planet, similarly, the impersonal Brahman is the shining rays of the Supreme Brahman or the Supreme Personality of Godhead.