I have Bowers & Wilkins 685 S2 speakers. When the headphone jack is plugged in I turn the volume up as far as it'll go and at over 12 ft away I can hear the audio out of my speakers.
They offered for me to send it in but if they find nothing wrong with it I'll be stuck with the expense of bench testing and shipping both ways. Kind of hard for me to trust their review of it. It reminds me of an insurance company telling me that they will cover customary and reasonable charges. And they are the ones that determine what is customary and reasonable.