All depends on what's drving it, parallel makes the most sense. If it's a minscule amp, it ain't gonna sound or work so good, 4 Ohms in praallel, needs some current. Those large Advents needed some WATTS...the more the better. After all these years the foam ain't all split and falling apart? WOW.

What will she be driving them with? The original Absolute Sound article had a Phase Linear 700 with the speakers wired in parallel for a 4 Ohm load (about 900 Watts). I'm running mine with a Phase Linear 400 driving each pair (800 Watts). Make sure the woofer foam surrounds are sound. Try the pinch test and if they crumble at all you will have to replace the foam surrounds. GeoAli does a great job if you don't want to do them yourself. Just search them on Google. The stacked double Advents create a big sound, hope she has enough of a room to handle it.

http://www.termpro.com/articles/spkrz.html
http://www.installdr.com/TechDocs/999016.pdf
http://www.usspeaker.com/speaker%20wiring-1.htm

She should be able to run a pair each on A and B. This will be in parallel and the receiver will see a 4 Ohm load. Or if the speakers are wired in parallel to the A speaker output the receiver will also see a 4 Ohm load, but you cannot put any other speakers on the B output. What kind of receiver is it?

Connecting the speakers in parallel halves the resistance of the load the amplifier sees. Wiring the speakers in series doubles the resistance. Thus, connecting the speakers in series is

For all things Advent you can check out this site: http://www.classicspeakerpages.net/dc/dcboard.php?az=show_topics&forum=5