mlknez....email steve davis..you can reach him via the 'axpona.com' site.he was the usa distributer for piega..he is a great guy and should be able to answer your questions for you...hope this helps...
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I can't answer most of your questions. Mine came with spikes installed.
Not sure about the relative volume level of the rear tweeter, but my guess is it is lower than the front tweeter.
I don't think there are any retailers left in the US.
The bass control would actually cut the response at 40 hz. I ran mine full range. Great sounding speakers. I might actually have an owner's manual, I can take a look.