The Siren Board

I'm wondering when this one was installed. The oldest ATI sirens have MCP style boxes with the controller and amps in one box and batteries in the other. This one has a box that was produced more recently unless it was upgraded. I'm also wondering if this one was produced around the time when they released the rotating ones. It may have single 400 watt drivers; each horn of the rotating ones had 2 400 watt drivers tied to it. Hard to tell what wattage this one is setup for when they use the same box for 1600 watt and 3200 watt units. Definitely interesting.

Edit: This is a 3200 watt siren. 1600 watt sirens have a smaller box and use 2 batteries for the one amp.