Which speaker did TAS put in place of Gallo 3

Here is the answer. I corresponded with Gallo Acoustics, and they have informed me that the 3.1 will be discontinued, but that they will be coming out with another pruduct later this year or early next year in that price range. The 3.1 will apparently be upgradeable to the 3.5, though the price of that upgrade is to be determined.

This news kinds of wrecks my plans. I had planned to purchase a single 3.1 for a center channel when I purchase a projection screen, but I had not planned to purchase a projection setup for about four to five years. Now, if I upgrade my 3.1 to a 3.5, which I may be willing to do depending on the cost, and purchase a single 3.1, I've got a different center channel speaker from the mains. I know I do not want to spend the money to upgrade a single 3.1 for a center channel, nor would I want to pay for a single 3.5 for a center channel. Decisions, decisions.

a single reference 3.1 is not that much more than a reference center, so, for the extra few bucks, I would get a center that was exactly the same as the mains, which is the ideal configuration in a home theater setup.

This is not true. Both Gallo and my dealer confirmed for me that I could purchase a single reference 3.1. When I corresponded with them about this approximately a little more than one year ago, they confirmed that Anthony Gallo himself uses three 3.1s in his home theater setup.

I presume what the manual is referring to is that when you buy them in pairs, you are buying a mirrored pair, as opposed to a non-mirrored pair, rather than you can only buy them in pairs.