As the test signals are generated by the subwoofer and fill the room, they are picked up by the microphone, which, in turn, sends the signal back to the PC via a second USB connection.
Ka ihe nlele ahụ na-eme site na subwoofer ma jupụta ụlọ ahụ, ha na-ewere ya na igwe okwu, nke, n'aka nke ya, na-eziga mgbaàmà ahụ na PC site na njikọ USB nke abụọ.