What Is Subwoofer Preout?

What Is Subwoofer Preout? A subwoofer pre-out is used for connecting powered or active speakers and subwoofers through an external source. High-end receivers usually have three pre-outs — one for the speaker and two for subwoofers. This allows the connection of both the speaker and the subwoofer simultaneously. What does preout mean? Pre-outs are used