Hi Everyone,
Thanks for all of the suggestions. Let me update you on what I have done:
I have tried Harmonic Technology Magic Link One and Purist Audio Venustas from the APL to the Preamp. The Venustas are very good and the cable to beat. I also bought a Electraglide Epiphany powercord for the APL, with a significant improvement.
I replaced my Signal Cable speaker wires with PS Audio Extreme Bi-Wire (7 Meters).
I had Alex at APL upgrade the unit with the AKM DACs.
All of these additions have resolved most of my bass quality concerns.
Thanks,
Mark