saṃskāradvayapakṣe tu vṛthā doṣadvayaṃ hi tat / yenānyataravaikalyāt sarvaiḥ śabdo na gamyate
In the dual-saṃskāra view, [raising] both faults is indeed futile, because when sound is not perceived by all, it is due to a deficiency in either one [of the saṃskāras].