I went to the Sydney Opera House when I about 5 years old. It could well be my imagination but I have this image in my head of large multicell horns either side of the stage. So I googled Sydney Opera House and Altec, and sure enough ALtec's were in the SOH at some stage.
Anyone know for sure what horns were used and if they were visible. It would have been around 1976 or so. If you have pic's that's even better!