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12/02/2024

Allen & Heath AHM Powers Astral Adventures At Laupheim Planetarium

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Located just outside the southern German city of Ulm, the Laupheim Planetarium and Observatory welcomes over 30,000 visitors every year to marvel at the wonders of space via the state-of-the-art Zeiss planetarium with its immersive fulldome projection system.

During 2023, the decision was made to upgrade the audio system at the facility to improve integration with the planetarium's speaker setup, featuring 9 speakers and 2 subwoofers in a 7.2 configuration with an additional 2 speakers installed at the apex of the dome. In addition, the system needed to offer a tactile interface suitable for use in the dark by the in-house engineers, plus the ability to control the planetarium lighting via the same physical controller.

Overseeing the audio mixer upgrade and integration was Dr Max Rößner, a freelance planetarium and immersive media engineer familiar with the esoteric demands of the application. "The planetarium world is an exciting field, but it is also a niche field, particularly when it comes to technology," he said. "Therefore, it is essential that engineers can make use of interfaces that are open and well-documented, and to implement solutions that truly address the customers' needs. The Allen & Heath AHM series and its ecosystem proved ideal for this."

At the heart of the new system is an Allen & Heath AHM-64 Audio Matrix Processor fitted with a Dante card. The AHM-64's rear panel analogue outputs are used to feed the 9 speakers and 2 subs in the planetarium, while a DT168 Dante Expander is used to provide localised analogue inputs to the system including wireless mic receivers, media players, and other auxiliary sound sources.

The building's main sound source is a PC fitted with a Marian Clara E Dante interface and running Reaper, which is synchronised to the projection system via SMPTE and sends audio over the Dante network to the AHM-64 for routing and control.

For control, a pair of IP8 remote controllers were deployed, each offering 8 motorised faders, 8 OLED screens, and 23 assignable SoftKeys for a highly configurable yet tactile mixing experience suitable for use in the planetarium's pitch-dark environment. The controllers are configured so that 10 of the faders are used to handle audio with the remaining 6 dedicated to lighting control.

"The IP8s integrated seamlessly during programming and commissioning," added Rößner. "The AHM's underlying architecture is flexible enough to enable the integration of unconventional functionality, such as lighting control in our case."

For lighting control from the IP8s, Rößner put the AHM's TCP/IP control protocol to good use. He configured the system so that 6 channels on the AHM, with level controls assigned to 6 IP8 faders, transmit MIDI NRPN data over ethernet to the lighting computer where it is translated to DMX. When the lighting is controlled by the show automation system, the IP8’s motorized faders follow, ensuring the operator can always reclaim control if needed.

"The AHM-64 offers features usually only found in open-architecture installed audio systems," added Rößner. "As an engineer, I feel perfectly comfortable in both the closed and open architecture worlds, but I appreciated how easy it was to implement and deploy advanced functionality in the AHM-64, especially as this was my first time using the system."

www.allen-heath.com
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