Source Audio Programmable Equalizer
DThe Zeta produces a fairly full-range sound and can be used without equalization. But for the Yamaha to achieve the results sought, a number of effects were tried before selecting the Source Audio Programmable equalizer. The device is extremely quiet, which is critical for adding post-EQ effects. The equalization effect can be sculpted to taste. What works best for my setup is to taper off the upper level (fight “tinniness”) and heavily boost the lower frequencies.
Tip: The battery seems to deplete rapidly, so a DC converter is recommended.