Zohar Ki Tetze
The Tefillin of the head have the essence of the Light from Binah that is the Tree of Life of Atzilut (Emanation). The Tefillin of the hand are the aspect of Malchut.
In the world of B’riah (Creation), the Tefillin of the head connects to Metat-. The Zohar quotes Jeremiah 17:12 to tell us that the Tefillin of the hand is the Malchut of B’riah, which is the throne of Metat-.
“כִּסֵּא כָבוֹד מָרוֹם מֵרִאשׁוֹן מְקוֹם מִקְדָּשֵׁנוּ”
“A glorious throne on high from the beginning Is the place of our sanctuary.”
From the aspect of the Tree of Knowledge Good and Bad, the evil inclination is ‘strapped’ under the good like a slave bound to his master.
The ‘voice’ of Torah, prayers, Shofat and Mitzvah is like a spear that stab and kill the negative side.
The sound of the Shofar is of the Central column, Zeir Anpin. It includes the elements of fire, water and air for Geburah, Chessed and Tiferet and the Patriarchs, Abraham, Isaac and jacob. The air blown into the Shofar and makes the sound has the warmth that is the aspect of fire and the left, Isaac. The moisture in the air that comes from the lungs into the Shofar is the aspect of water, Chessed.
The air includes the other two and for that it represents Jacob, the center and Zeir Anpin.
The Shofar blowing on Rosh Hashanah has three sets of 30 blowings to cover for all the possible variations of the blowing and the three columns. Spiritually (according to halacha, as I heard from rabbi Ben Zion Mutzafi) listening to 30 blowings (one set) would be sufficient to give us the protection that we need. Obviously 3×30 + 1 + proper consciousness is the best.