Audiogon bluebook has the Duo 2.2 sII listed at $7550.00 used.
Why don't you "test" your neighbor a bit by turning it up a little at a time and see if you get any feedback from him. You could also invite him over for a drink and show him your set up. Those speakers are certainly beautiful and a conversation piece.
Why don't you "test" your neighbor a bit by turning it up a little at a time and see if you get any feedback from him. You could also invite him over for a drink and show him your set up. Those speakers are certainly beautiful and a conversation piece.