Kalem by Zak is a restaurant based on a casual dining concept. Located in a modern and newly opened hotel Pupin, it's one of the best locations in the very heart of Novi Sad. Its interior is inspired by the character and work of the Serbian physicist Mihajlo Pupin, and in addition to tasteful specialties, it offers a large selection of wines from around the world. AVL Project Int, RCF official distributor for Serbia, developed the entire project.
The indoor sound system of the restaurant consists of RCF M 501 Media Series, evenly distributed throughout the dining area. The M 501 is a multipurpose two-way full-range speaker system, suitable for a wide range of indoor applications. Its compact, elegant and neutral design makes the M 501 a good choice for many environments, with available mounting accessories for wall or ceiling positions.
The town of Clinton, NY is the home of Hamilton College. Precision Audio Services has provided audio engineering services to the college’s Music and Theater Department for several years, and this spring the company heads up a sound system upgrade in Wellin Hall. The 700-seat hall has served as the central hub of music education and concerts for the college since its construction in the 1980s. The bare concrete and polished wood walls combined with flown wooden acoustic panels above the audience creates a highly reverberant environment—perfect for the hall’s original purpose of unamplified acoustic performances.
However, these properties that make the environment desirable for acoustic performances, also make sound-reinforced events a significant challenge. "With an RT60 of almost 2.5 seconds, achieving a clear mix and vocal delivery is typically a major source of frustration for visiting mix engineers,” says Michael Lawrence from Precision Audio Services. “Although to a large extent, this is simply the reality of working in such an environment, one of the goals for the new design was to increase the consistency over the space and minimize excess energy splashing onto the walls and other non-audience surfaces, both areas where the current installed system struggled."
Another design challenge was presented by the way the space is used – or, more accurately, ways. The hall hosts a wide variety of musical, theatrical, dramatic, and speech events that necessitate a large degree of flexibility, where the current system presented some limitations. “We have three different mix positions depending on the needs of the show,” explains the venue’s Technical Coordinator, Bill Di Paolo. “Sometimes we are driving press feeds, live stream feeds, backstage zones, and we need a way to pull those feeds off the console without the operator having to jump through hoops. Another thing that’s been a bit of a problem for us is that the current mains are dead hung, so there’s no way to get to them for maintenance if there’s an issue. We had to swap out a bad box last year and it turned into a whole labor call just to get the box down to the deck to be worked on.”
The system design is far from the traditional install-patch approach. “Sometimes I have to adapt to things very quickly, on the fly, and in the past that’s been a challenge where we couldn’t get physical access to a loudspeaker, or all the signal flow was happening in the back of a rack somewhere with no easy way to get signals in or out of the rig at various points in the chain,” Di Paolo notes. “For larger events, we typically have a dedicated sound engineer but often it’s just me trying to handle multiple things at once, or we have a student operator, and so we need to be able to get to things easily.”
Starting from the console outputs, the new system design approach allows quick and easy changes before or after the processor, all the way to the loudspeaker positions themselves. No punch-down connectors in the back of racks – all the system patch points were brought to the front of the drive rack in a custom XLR patch bay system from Elite Core Audio, resembling more of a touring rack design mentality. I knew of several DSPs that would have been an appropriate fit for this project, but settled on an Allen & Heath AHM-64, which I felt offered the “best of both worlds” between a typical install-type free-wire DSP and a more live-oriented fixed-structure DSP.
An A&H IP6 controller sits next to the mixing console, configured for quick access to mute/unmute the entire PA plus dedicated mute and level controls for the ADA assistive listening system, the backstage 70-volt system, and the press send. These feeds are derived from the console mix and accessible via the patch bay, so providing a press send is as simple as plugging in a cable and turning a knob to adjust for the mic or line level requirement of the press equipment.
The main PA hangs presented some issues as well – the existing hang point locations didn’t allow for the hangs to be lowered for maintenance due to the proximity of the loudspeakers to the hall’s architectural elements and lighting fixtures. "We decided to move the hang points onstage about 18 inches, which would further the clearance away from the side walls to allow the arrays to be freely raised and lowered. It required the creation of new points via custom-length bridles between existing steel. This enabled the system to be lowered for maintenance or simply have the trim height adjusted for various events. The standard trim height was chosen to be the best compromise of sightlines and coverage, while the chain falls gave the option to lower and re-splay the arrays for theatrical events in this space – something not achievable in the past." Lawrence explains.
In 1932, Sulim Kadyrov was convicted by the authorities for teaching the Holy Quran and religion of Islam. For his actions, he spent 14 long years in the Gulag camps.
The grand opening of the mosque took place on August 21, 2020, with the head of the Chechen Republic, Ramzan Kadyrov attending as a special guest. The celebration coincides with the 69th anniversary of the birth of the first President of the Chechen Republic, hero of Russia, Akhmat-Khadzhi Kadyrov.
The air volume of the hall, taking into account the under- and upper- balconies, is about 14,000 m3, with a total surface area is 6360 m2. Acoustic calculations were measured by the computer modeling software AFMG EASE. The sound system covers the entire premises of the prayer halls (the main prayer hall and two halls on the basement level), providing optimal intelligibility as required.
Since there are no intelligibility standards required in Russia, ARIS engineers used external scientific publications about acoustic standards in mosques, including those carried out by ARIS, and with the support of the Acoustics of Halls, inside the Research Institute of Building Physics laboratory (RAASN). According to these studies, taking into account the volume of the main prayer hall, the optimum reverberation time for RT60 in the frequency range of 500-1000 Hz should be from 1.9 to 2.2 seconds. "Since there were no possible adjustments to the original finish, the challenge to reach the optimal RT60 was difficult," comments Alexandr Shamray, Head of Sales at ARIS. "To achieve good intelligibility, the Speech Transmission Index (STI) must be around 0.60, for excellent transmission, or more. Taking into account the extremely high resonance of prayer halls and the lack of a meaningful reduction using acoustic absorbers, we focused on intelligibility parameters. Relying solely on controlled directivity and quality of the sound system we worked on reaching 0.50-0.55 (or higher)".