What is the Buddhist perspective on passively altering your subconcious?
Sorav,

Interesed, serious and the Tripple Gems respecting readers, 

listening to the teachings, if done right, straightens ones Right view. Doing it wrong increases wrong view and primaly respect. Althought even foolish and respectless monks merely even force to make Dhamma simply food for consuming and throw it on the worlds market for short and poor livelihood, one should not follow their way and use the medicine right.

Listen unattentive Dhamma while doing even unwholesome deeds manifest on and on latent disrespect an closes up the door to Dhamma.

Some good advices in this regard are found in "Abidhamma in daily live" (dhammadesana), by Ven. Ashin Janakabhivamsa.

It's not mindful and not conductive to just consume Dhamma, since it requires giving at fist place.

To answer short on "What is the Buddhist perspective on passively altering your subconcious?"

The "Buddhists" perspective here is trade for gain and the world, while this of the Buddha and his following discipeles is letting go and Nibbana. One way is that in the world, another to Nibbana. Knowing this clearly one is not a little after any gain.

(Since detail discussion is not so welcome here, and the enviroment not so proper for Dhamma Desana, feel free to raise question, even audio here.)

[Note: This is agift of Dhamma, not meant for commercial purpose or other wordily gains]