The Northstar never had digital sound but did have 70mm capability with magnetic sound. The sound processor was a Dolby CP200 and I must admit that the sound quality came very close to current digital formats. In 35mm mode the CP200 was standard 4.1 sound (L,C,R,S + OBE).
Sorry, but the Convention Centre was a single screen theatre. I used to service the equipment from about 1990 thru 1995 and defineitely would have noticed a second set of projectors!
The equipment was Ballantyne Pro-35 projectors on Ballantyne Model VII soundheads with Strong Lumex lamphouses running 1600 watt xenon bulbs all mounted on Ballantyne VIP bases. The sound system was mono and they ran 6000 foot reels, so a changeover was necessary every hour or so. The rectifiers were single phase thyristor current controlled (the only ones I’ve ever seen) with buck/boost transformers mounted on the line side to try and compensate for some of the wild power fluctations in that building.
The Northstar never had digital sound but did have 70mm capability with magnetic sound. The sound processor was a Dolby CP200 and I must admit that the sound quality came very close to current digital formats. In 35mm mode the CP200 was standard 4.1 sound (L,C,R,S + OBE).
Sorry, but the Convention Centre was a single screen theatre. I used to service the equipment from about 1990 thru 1995 and defineitely would have noticed a second set of projectors!
The equipment was Ballantyne Pro-35 projectors on Ballantyne Model VII soundheads with Strong Lumex lamphouses running 1600 watt xenon bulbs all mounted on Ballantyne VIP bases. The sound system was mono and they ran 6000 foot reels, so a changeover was necessary every hour or so. The rectifiers were single phase thyristor current controlled (the only ones I’ve ever seen) with buck/boost transformers mounted on the line side to try and compensate for some of the wild power fluctations in that building.