Source: Tome of Magic
You can project the power of an utterance to a greater distance
Prerequisite: Truespeak 6 ranks, ability to speak utterances
Benefit: If the utterance is successful, you can increase its range by 100%. For most utterances, this means the range becomes 120 feet. This feat has no effect on utterances with a range of touch. An enlarged utterance has a Truespeak DC 5 higher than normal.