The DBX Equalizer for music works best with Rotel's RC-1590 Preamp and Rotels RB-1582MKII Power Amplifier. The Sony-az7000es with music isn't as clean and has less upper bass, the bass with the Sony is a little muddy and the Midrange Frequencies are a little Mashed together. The Rotel Combo actually should sound better as the dual cost more than the Sony-az7000es. The Sony is a Multichannel home Theater Receiver. The Rotel dual is only Stereo, ... 2 channels. Movies also sound better on the Rotel Dual than the Sony-az7000es. Just sit in the sweat spot and Wow! Then Rotel blows away the Sony. Most important if you like Dramas and movies with a Good Story. Voices are more realistic.