This is the position of the polyphase filters, which are all-pass filters and only modify the stage. The phase romance involving the two polyphase filters in this example is these kinds of that it will compensate for that further "twist" so that the stage amongst the desired very low frequency https://1rkforrentgurgaon.blogspot.com/2025/07/book-spacious-boys-pg-in-sector-15-part.html