Taken from Art of Chanting Hare Krsna by Mahanidhi SwamiVacika - loud chanting that all can hear, as in kirtana, is a hundred times more beneficial than uparsu japa. The Caitanya-bhagavata tells how the caste brahmanas once challenged Haridasa to prove which scripture sanctioned his loud chanting. Haridasa Thakura replied, "Nowhere in the scriptures is loud chanting of the holy name condemned. In fact, the Srimad-Bhagavatam 10.34.17 says: yan-nama grhnann akhildn srotfn atmanam eva ca sadyah pundti kim bhuyas, 'O Acyuta, anyone who chants Your name purifies himself along with all who hear his chanting.' In Naradiya Purana, Prahlada Maharaja says, 'Compared to the person who is attached to chanting silently, the person who loudly chants the holy name of Hari is one hundred times better. A silent chanter liberates only himself, but one who chants loudly liberates himself and any other living entity who hears him.' "