I have experimented with both 10-band PEQ/GEQ in the digital domain and the bass/treble tone controls on my Cambridge Audio Azur 851A. Although I was able to adjust the SPL curve to closely match the target (desired frequency response), I was still not satisfied with the resulting sound quality.
In my system, the improvements achieved through analog cable and preamp upgrades were more satisfying than those obtained through EQ. This can be illustrated in two main areas:
- The treble produced by EQ was less edgy, but it was not as smooth and refined as what I experienced from the cable and preamp upgrades.
- EQ added more bass weight / presence, but the cable and preamp upgrades also delivered more nimble, textured, and bouncy bass.
As a result, I ultimately abandoned EQ altogether and have no intention of revisiting it.

