A local Czech Republic theater recently decided they needed to upgrade its audio systems to enhance the audio experience for fans of the beloved puppeteering performances. The Alfa performance art theater in Pilsen, began its project to upgrade its 20-year-old sound system for greater flexibility and a higher level of performance. The puppeteering theater’s new sound system—powered by a set of high-quality, multichannel Dante Connect Series amplifiers from LEA Professional— was designed by the region’s primary AV distributor AudioMaster CZ and installed by local AV integration firm Audio Kropik and features a range of modern technologies, including integrated DSP, web connectivity, and advanced audio networking.
Founded in 1963, the Divadlo Alfa performance art theater (known locally as The Alfa) is a well-respected, 232-seat theater specifically designed for puppeteering. Focused initially on performances for children, the theater company has evolved over the decades to present many genres, including classics such as The Three Musketeers and original, modern productions for adults that focus on sophisticated parodies of current social issues. The company has ten puppeteers who produce more than 220 performances annually. The theater also organizes and hosts a puppeteering festival each year.
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AudioMaster CZ initially received a call from the theater's sound engineer explaining that they were having trouble with their system and needed them to work on a completely new system design. The team then worked with Jan Zvánovec, from Audio Kropik, the largest seller of AV equipment in the South Bohemia region, to bring the design to life.
“The theater’s sound engineer was having big issues with their existing system,” said Jan Zvánovec, project manager, Audio Kropik. “We met him on site and discovered that they had speakers that were not working and older amplifiers that were deteriorating and beyond repair—the system had simply reached its end of life.”
The theater would need to replace all the defective units, but with the age of the system, it was only a matter of time before the other components failed. Theater managers and the Audio Kropik team realized that it would be easier and more cost-effective in the long term to redesign and replace the theater’s entire sound system, including all loudspeakers and amplifiers.
“The client decided to take this opportunity to not only repair the system but to also greatly improve its performance,” added Zvánovec. “They wanted to upgrade to a modern, clear, high-quality sound; and they needed it to be more flexible and easier to use. They also wanted new loudspeakers that would better blend into the theater visually."
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The team began searching for system components to fit the theater’s requirements and limited budget. A critical specification was to find high-quality, multi-channel, audio-network-ready amplifiers that were affordable but could also deliver the power needed for the theater.
Many AV manufacturers were having supply chain issues and did not have products available. Additionally, the Alfa only had a small window of time available for the project to maintain their busy show schedule uninterrupted. Upon the recommendation of a colleague at AudioMaster CZ, Zvánovec decided to give LEA Professional amplifiers a try.
“I had not used LEA amps before, but they seemed to have all the features we were looking for, at a good price, and they were available,” said Zvánovec. "The amp's cloud technology, built-in DSP, and the preset features were also very interesting; I wanted to see what these amps could do."
The team upgraded the theater system with a set of three Dante Connect Series amplifiers. Two LEA CS354D, 4-channel amplifiers are used to power the upper and lower, left, right, and center main speakers, and an LEA CS704D 4-channel amplifier is used to power the system’s subwoofers. The new system comprises a mix of nine JBL AE Compact Series loudspeakers. A Yamaha DM2000 digital mixing console, equipped with a Dante network card, communicates directly with the LEA amplifiers via the Dante audio network protocol.
The LEA Connect Series is the world's first IoT-enabled, professional-grade series of amplifiers. Ideally suited for medium-scale installations, these two-, four-, and eight-channel amplifiers feature direct HiZ (70V or 100V) or LoZ selectable by channel. With three ways to connect, system designers can engage the Connect Series' built-in WiFi access point, connect to the venue’s WiFi, or use the Ethernet to connect to any local area network via Cat5 or Cat6 cable. The Dante Connect Series also features analog inputs, Dante inputs, and external I/O control for remote on/off and fault monitoring.
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“The amps’ built-in Dante technology made for an extremely simple connection between the mixing room and technical room; everything worked on the first connection, and we have a lot of flexibility for easy, future upgrades,” said Zvánovec. “And there is also no need for external speaker processors because everything is managed by the DSP that’s built into the LEA amps. These features alone saved the client a lot of money and time."
Using professional audio amplifiers with built-in DSP has become the standard practice for many AV system installers. DSP-powered equipment can do more with less, and therefore installers don’t need to buy, install, or maintain dedicated DSP equipment. Integrated DSP frees up critical rack space and reduces system weight. All the input routing, room tuning, speaker tuning, and limiting are built into the amplifier, so equipment racks are smaller, lighter, and cleaner.
“All the connectors and features of the LEA amplifiers are very logically arranged and well-engineered; the manufacturer thought of everything from the installer point of view,” said Zvánovec. “Setting up the amplifiers with a web browser is great, and we created several presets and stored them in the amps so the client can easily change the settings. Finally, no complicated installation and setup of applications; it was all very quick and easy.”
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The LEA Web User Interface (Web UI) allows users to view the status of every channel on any given amp to quickly monitor channel performance, including data such as an output meter with a clip indicator, status indicators such as Ready, Limiting, Thermal, and Fault, as well as a quick attenuation level view and channel mute button. With the Web UI, users can also adjust channel settings, including Input Settings, Signal Generator, Crossover, Equalizer, Limiter, and Load Monitoring.
“Upon first hearing the new system, the client was extremely impressed in that the system sounded so much clearer and better than they had expected; this is thanks not only to the new speakers but also thanks to the powerful, natural sound of the LEA amplifiers,” added Zvánovec. “I'm glad we had this opportunity to learn about and try the LEA amps; we're definitely adding LEA to our list as a preferred amp supplier for future projects."
