I definitely would not connect the AC ground to the Chassis. The designer would have done so if he wanted, and may have in fact. I would only plug the component into AC as directed.
Likewise, I would not connect the signal ground to chassis, again, the designer would have done so if he wanted.
You may be confusing ground loops with Ground Loop Potentials, which cause hum because the interacting components do not share the same power ground.
If you have no hum, relax and enjoy the music. Please check your previous post, I added a section on controlling surges and line noise.
Likewise, I would not connect the signal ground to chassis, again, the designer would have done so if he wanted.
You may be confusing ground loops with Ground Loop Potentials, which cause hum because the interacting components do not share the same power ground.
If you have no hum, relax and enjoy the music. Please check your previous post, I added a section on controlling surges and line noise.