My experience is similar to Al's. A bit of history is relevant:- Before CDs the alternative sources to LP were typically a radio tuner and tape/cassette deck. My old tuners output 300mV to 500mV, or about half a Volt. CD players were designed to be 2 Volts, but many have crept up to 2.2 or more (louder equals better, right?). So they were much louder than LP or tuner sources. They still are!
Meantime, amplifiers haven't changed enough and many are too sensitive. This means you get max volume by about twelve o'clock on the volume knob. This impresses buyers who think amps are powerful, but is a bind at home where you want maximum sensitivity and range on volume, and quiet backgrounds. Some amps, like my Primare, allow you to alter the input sensitivity which overcomes this.