Piega P10 questions

I just got some Piega P10 speakers and am trying to learn more about them.

1. When enabled, are the rear tweeters supposed to be at the same relative volume level as the fronts?

2. How do you take off the feet to install spikes?

3. Piega says they do not have any manuals left, any source of manuals for these around?

4. Any resellers in the US or Canada?

5. What is a good matching center?

6. How does turning on the bass extension change the frequency range and crossover points of this speaker?

7. Are there generic carpet spikes available that work with these speakers?

Any help would be appreciated.