Berliner Lautsprecher Orchester (since 2013) developed by Wolfgang Heiniger. This orchestra has not a symmetrical set-up, in contrary to the Acousmonium.
A short video showing some of the loudspeakers used in the nowadays Acousmonium of the GRM:
Guai ai gelidi mostri (1983) by Luigi Nono, with live electronics on 10 loudspeakers in the concert hall (of which you won’t hear anything on youtube of course…). A piece to hear live in the concert hall!
A short interview with Lynn Pook about her work Aptium (unfortunately just in French!):
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Philips Pavilion (1958) by Le Corbusier, Iannis Xenakis and Edgar Varèse: