Review on YAMAHA A-S501BL: Powerful Natural Sound Integrated Stereo Amplifier in Black by Lisa Adams

1. Powerful: When I first got the amplifier, I connected it to my smartphone, which was a mistake: I was disappointed with it , which I turned the amp volume control up to 90% (same thing on the phone) to listen out loud to "tickle" my four speakers (two 33lbs and two 40lbs). A few days later I hooked up a Blu-ray player via an optical cable and a DVD player (no region) via a digital coaxial cable: what a difference! At about 50% (12 hours) of the volume control, the audio was as loud as I expected a few days ago, no matter what player I was using.2. Sound quality: fantastic3. Material Quality and Durability: As advertised, well designed and built - spotless4. Disadvantages/Possible improvements (mainly comfort features): - no Bluetooth, which would still allow to show the artist and song title on the display of the amplifier - no display to show the volume (in % or decibels) - bass, treble, balance and speakers ( A+B) cannot be controlled via the remote control