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Can one hear two sounds simultaneously? The Gemara (גמרא) on Rosh Hashanah 27a compares the principle of trei kali lo mishtam'a (two voices cannot be heard at once) to the Sinaitic experience of zachor v'shamor. The shiur works through the machlokes Rishonim whether one must hear both shofar and chatzotzros in the Beis Hamikdash, and analyzes the Ritzba's understanding of mosach b'tekiah—whether a long tekiah can count for multiple sets.
This shiur analyzes a complex sugya in Rosh Hashanah 27a dealing with the principle of trei kali lo mishtam'a—the concept that two voices or sounds cannot be heard simultaneously. The Gemara (גמרא) presents a difficulty: the Mishna discusses the Beis Hamikdash practice where both shofar and chatzotzros (trumpets) were blown together, yet the Gemara states that two sounds cannot be heard at the same time, as evidenced by the miracle at Sinai where Hashem (ה׳) spoke zachor and shamor simultaneously. Rabbi Zweig begins by examining the Tur Even's approach, which holds that there is a mitzvah (מצוה) to hear both the chatzotzros and the shofar in the Beis Hamikdash. This creates a genuine parallel to zachor v'shamor, where both statements needed to be heard but couldn't be heard naturally. The difficulty is that if trei kali lo mishtam'a applies, how could one fulfill the mitzvah of hearing both sounds in the Mikdash? The Gemara's answer—that one is marech b'tekiah (extends the tekiah) so that the end can be heard without the beginning—resolves this by showing that one can be yotzei with a sof b'lo techilah (an ending without a beginning).
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Rosh Hashanah 27a
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