My PDX-5 will only accept line level input i.e. low level rca input, if you feed it speaker level input it will be too loud. Not sure if this answers your question.
650i F12 - HUD, 6WA, SLI, Logic 7, Dynamic and Adaptive Drive, Comfort Access, Soft-close, top-view,
Previous X5 40d M Sports and 535d LCI