I have a basic question that perhaps I’ve known the answer to before, but don’t remember, or perhaps I sort of understand, but not really. I will first be pairing this JBL with an NAD M28. According to the NAD M28 spec sheet, the input sensitivity is “1.3 V (rated power).” What does that mean when pairing these two devices? Does it mean that the M28 doesn’t emit audible signal until 1.3 V? Does it mean 1.3 V is somehow the “sweet spot”? Does it mean that the ”rated power” was tested at 1.3 V?
It just means that at 1.3V the amplifier will reach its maximum power. And it's probably an incomplete spec, because it does not tell you if this is balanced or single ended. Most likely it's a single ended spec, since balanced usually has a higher voltage.