Gonk and Koyaan, thank you both for your responses, which lead me to ask the following questions:

1. What, if any, difference will adding a "distribution amp" instead of a splitter cable between my 990 and the additional outdoor zone 2 amp, especially considering that my additional outdoor zone 2 speakers may have more watts, and may have different sensitivity and/or ohms?

2. aswAQ21Given that I may likely drive 4 to 6 speakers and 1 to 2 subs in my additional outdoor zone 2, would it be better to have more than the two

2. Assuming my additional outdoor zone 2 amp will notWhat is the "term of art" name and/or name of product/manufacturer of the device I could use to control volume (so I can search