Learn Farsi: شاید صدابردار برای تدارکات تجهیزات پشتیبان بیاورد. - The sound recordist might bring backup equipment for the logistics.

Because of the word shâyad (perhaps/might). When you use shâyad to talk about a present or future possibility, it always forces the main verb into the present subjunctive form.

The subjunctive prefix is usually be-. Why is it bi- in biâvarad?

The infinitive is âvardan (to bring), which starts with an â sound. When adding the be- prefix to verbs starting with â, Farsi inserts a y sound to link them and shifts the prefix pronunciation, resulting in biâ- (like biâvarad) for smoother speech.

Both tadarokât (logistics) and tajhizât (equipment) end in -ât. Is that a plural suffix?

Yes, -ât is a plural marker borrowed from Arabic. While Farsi generally uses -hâ or -ân for plurals, -ât is extremely common for formal, technical, or administrative terms.

How is the word sedâ-bardâr (sound recordist) constructed?

It is a compound noun made of sedâ (sound or voice) and bardâr, which is the present stem of bardâshtan (to pick up or take). Literally, it translates to a 'sound taker'.