Author: AVLAdmin

Stage Safety Basics For You To Put Into Action Today

Let’s have a little talk about stage safety, specifically in relation to use of any kind of stage rigging, lighting or other equipment in a theater.

Note * This is not an exhaustive study but simply a “basics list.” We find most schools don’t even have the basic level of safety procedures in place.

Stage safety basics for all theaters including high school auditoriums. #tips

When no one is monitoring the stage systems, accidents could easily happen and most of them are avoidable. As we visit schools to review their systems, we often discover unsafe conditions which have not been addressed and that no documentation has been created to let anyone using the stage know that a dangerous situation exists. That is never a good idea.

Start With Stage Changeovers

There should be procedures in place, with sign-offs, indicating that people have checked the status of their contribution to the stage before a show starts. People should not be randomly building sets, attaching lights, adding microphone cables, lighting cables and the like without certifying that they have first done a proper, coordinated safety check. That check needs to indicate nothing is snagging, everything is attached with proper load-rated hardware and that everything is in balance. This must be a written document, accessible to all on stage. It is imperative that anyone using the stage review this safety checklist first, prior to use.

Failing to maintain this documentation is like loaning a car to someone without telling them the brakes don’t really work so don’t stop suddenly. “Oh, and the gas gauge is broken and I’m pretty sure that the headlights don’t work.”

Stage Checklist

There should also be a form that gets logged and signed off at the end of a performance or rehearsal that indicates the condition of all stage systems.

A sample basic checklist:

  1. All rope locks are engaged.
  2. All of the battens are properly counterbalanced.
  3. All battens are free from any tangled wiring or items that could impact adjacent battens.
  4. All lighting circuits are plugged and checked.
  5. All fixtures that are assigned to the show plot still work.
  6. All fixtures have safety cables.
  7. No defective wiring was found.
  8. There are no stage weights or anything in the locking rail that could cause problems.
  9. There are no trip hazards on stage
  10. Etc…… There are a multitude of things that should be on a sign off sheet depending on the show, venue, and special conditions. 

Where a checklist alone does not suffice to indicate a safety hazard, you may also need to rope off, lock, or mark safety hazards that can’t be corrected immediately.

Safety Procedural Manual

There should be a Safety Procedural Manual for every stage. Some really good ones are available online for review. Maintaining stage safety protocols is not just a matter of making a checklist of two or three things. There are pages of checklists items that should be followed every time you change anything for show, or plan and build a show.

Define Your Team

You should also make a list of authorized personnel. Not just anybody should be able to go up on stage and perform work or run rigging systems.

If you can’t do the math to figure out the load on a batten, then you shouldn’t be allowed to touch it.

If you can’t walk up to an arbor and by a quick visual and manual inspection of the operating lines determine whether the set is in-balance or out of balance, then you shouldn’t be opening a rope lock at all.

These procedures should be in the training manual. People who have been trained should be certified by the school.  Letting just anybody do anything on a stage is a recipe for trouble.


Let’s look at  an example of what can happen.

You walk in and need a curtain that is flown out  to be  moved down towards the stage. The person who used the stage last, for some bizarre reason removed a bunch of counterweights from the curtain set arbor after it was up. That arbor is light and the curtain is heavy. You don’t know enough to recognize what has happened, so you go ahead and release the rope lock causing the curtain to come crashing down towards the stage.

There are a couple of possible outcomes this un-safe scenario may produce. In the case of a stage curtain, when some of the weight of the curtain  lands on the stage, it slows down. If you’re  lucky it stops before the batten it’s attached to  hits anybody in the head.  But, sadly, things could go the another way and it will injure somebody.

Lack of safety procedures and not insisting upon sign-offs puts people in physical jeopardy. Sign-offs basically say “Hey, show’s over. I checked all of the sets, everything’s in balance [i.e. safe] so that when you release the rope lock, nothing will start moving much by itself.” Insisting on official sign-offs makes it safer for non-skilled people to use the stage.

It is still not a good idea to have non-skilled people working the stage but, at least, it is safer with a checklist.

What if there is an electric cable that is frayed, a light was flickering, or the sound system was making a humming noise that it never made before?  Log It. There must be a reporting procedure so that when anything like that is found, it will be logged and communicated in writing to someone who can check into maintenance.

Note: Procedural manuals are also needed but that is another topic. How sets are  built, use of paints, special effects, power tools, fall protection, use of ladders, electrical safety, issues with strobes, lasers, etc…. will need to be in your procedural  manual.

Here is a well-thought-out manual by Southern Oregon University, available for you to read (not plagiarize): Sample Stage Safety Manual

Stage Rigging Inspections

You must have inspections on a regular basis by qualified professionals. These inspections will identify where there are issues and other problems that a general checklist cannot address. ESTA and ANSI standards require inspections of counterweight manual and motorized rigging that need to be performed annually and or biannually. On motorized rigging and stage lifts, the inspectors have to be versed in the specific system, general knowledge does not suffice.

If these inspections are not being done, you’ve now left your people “using a car with bad brakes.”

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Copyright AVLDesignsInc 2020

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music studio

University of Rochester Recording Studio at Gavett Hall


Popularity has its challenges. The University of Rochester, for instance, offers an audio and music engineering program which already had a couple of recording facilities on campus. With a vision for the future of the sound industry, and under the leadership of Grammy Award winning audio engineer Stephen Roessner, this rapidly growing major of study at the university needed new space.  

New recording studio in U of R’s Gavett Hall.

To accommodate the growth and development of the program, the U of R planned to install a new recording studio with larger live rooms, multiple mix rooms and a large control room for instructional purposes.

The building that was selected was Gavett Hall. The team of experts hired to carry out the task were AVL Designs Inc., SWBR architects and Bergmann Engineers working in conjunction with the U of R decision makers.

The greatest challenge in utilizing Gavett Hall for the studio is that the location put the live room directly above a computer lab in an existing building. Live rooms can have sound pressure in the 104dB + range when used for live bands. It was critical that these sessions could occur without the computer lab hearing it.

Source University of Rochester photo J. Adam Fenster

AVL Designs Inc. was contracted for acoustical design as well as creating an infrastructure for equipment to be added at a later date. Working with SWBR’s architect and their structural engineer, we had to find a way to assess what options we would have for controlling transfer between floors. A floating slab system was designed but it was being installed upon a substrate that was not the standard for this type of system.

Utilizing custom software, an estimate of field STC (Sound Transmission Class) for this assembly was derived. Walls were designed to isolate the live room from the main control room as well as from hallways and adjacent mix suites. High STC doors from industrial acoustics corporation were selected for all of these spaces as well. Final field tests confirmed that the floor to floor isolation was within two decibels of design standards, which with a custom assembly is exceptional.

Mechanical noise in the spaces needed to meet very low levels, in the RC 20 range. We also had to make sure duct runs and conduit did not create sound breaks in the wall construction which was designed to high STC levels.  This required specialized mechanical design and electrical.  Our AV design team worked with mechanical and electrical engineers from Bergmann Associates to achieve the desired results.

The university has since outfitted the spaces with their own equipment and have installed wiring to the infrastructure that was designed in the project and the project went online very recently.

Read Bergmann PC’s article here

Read University of Rochester’s article “The Art and Science of Sound” here

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Copyright AVL Designs Inc. 2020+

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Video monitor

New Television Studio Facility at Edison Tech

As part of an expanded program to teach high school students production in the news and television arena, Edison Technical High School in Rochester, New York has added a new 4k-capable television studio facility.

New television studio facility at Edison Tech in Rochester New York.

AVL Designs Inc. created the design for acoustics, video systems, lighting, curtains and rigging.

The soundproof studio allows observers to watch the on-camera action through adjacent windows. An attached computer classroom with video editing CPU’s is available for students to edit and modify the content produced in the studio. See more =>>

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Grewen Hall at LeMoyne College Syracuse NY

LeMoyne College – Grewen Hall

Grewen Hall at LeMoyne College Syracuse NY

Grewen Hall at LeMoyne College in Syracuse, New York is the oldest – and largest – building on the prestigious campus. Built in 1948, the 86,500 square foot Grewen Hall boasts 17 classrooms, numerous administrative offices and lecture halls.

Acoustical and audio visual designs by AVL Designs Inc for Grewen Hall

AVL Designs Inc. has been working with Le Moyne College for a number of years on many successful projects including classrooms, medical wings, science buildings, performance spaces and other parts of the campus. This most recent project was a renovation of a large lecture hall in Grewen Hall.  AVL Designs Inc.  created the acoustical, as well as audio visual,  designs. 

Pictured here:  assorted wooden acoustical panels  – some absorptive, some reflective-  chosen for their excellence and unique functions. The extensive AV system features a Crestron control system and Panasonic projectors.       

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Auditorium Acoustic Options

In the past, auditoriums were generally purpose-built. Opera houses were designed for opera. Orchestras often share the opera house by adding a stage shell that would aid the orchestra acoustically.  

Lecture halls were designed for speech. Movie theaters were designed for sound reinforced by audio from loudspeakers.  

Churches were designed for various styles of music and use. Some spaces were built around the required characteristics of a large pipe organ.  As liturgical spaces are being repurposed for contemporary music and changing congregations, the results are often not very good.

Multipurpose auditoriums were never really multipurpose.

They were a middle of the road compromise.

When preparing to design a space from an acoustical point of view, the first question that has to be answered is:

What type of performances and uses should it accommodate?

Next Question:

Can I target a style or do I need variable acoustics?

Generalized Examples:

  • Unaided speech requires a quiet room, lower reverberation time and strong early reflections.
  • Orchestral requires a  longer reverb time, extended bass response, and a diffuse room response.
  • Contemporary music driven by sound reinforcement requires a completely different room character. In order to allow the sound system to control the experience, the room has to be subdued.

Personal Experience:

Dead Room

Live music can be disappointing in the wrong environment. I remember once I was working with a jazz artist and the auditorium we were booked in was entirely covered in thick fiberglass wall panels. It was dead as a doornail acoustically.

Even when using reverb effects, the room still sounded wrong. The reverb was coming from the PA and the stage monitors, not the room. The side and rear walls were absorbing everything, not adding anything to the sound. Not a great experience.

Overly Live Room

I also remember hearing a favorite artist (Jazz/Bluegrass) in an opera hall. The room was so live it was totally muddled. The sound system could not correct for the overly reverberant room.

How About a Variable Room?

If you build a room with no acoustic variability, as and audience member or performer you are stuck with what you have.

Acoustical Variability to some degree can be accomplished with wall covering drop curtains, rotating walls with various materials, and other options. Physical options can be costly and they can take significant manpower to change for each event type.

Electronic Acoustic Architecture

Most people are familiar with movie theater surround sound. THX, Dolby, Dolby Atmos etc…. These systems create spatial locations for sound sources using a multitude of speakers, each receiving specific information to simulate where the sound would be coming from, or to extend the “feel” of an environment.

While these systems are great for movies, they aren’t deigned to work  with a live musical source.

Fortunately recent advances in technology have made it possible to go beyond surround sound into fully simulated live acoustic environments. Imagine you are performing in a relatively plain room with a medium reverberation time and not a lot of lateral energy. Walking the seating area, you find that there are dead spots and changes in frequency balance. Your ensemble sounds a bit thin and lifeless.

Like A Concert Hall

What you want for your ensemble is a much larger room with elegantly tailored wood and brick surfaces, diffusive in nature like a concert hall. Features like these are what makes concert halls concert halls.

Imagine, now, an electronic acoustic system that can create the sound of the room that you are not in.

This Is How Electronic Enhancement Works:

  • A series of prearranged microphones pick up the natural sound of the ensemble, organ etc… from a suitable distance so the sound is well mixed. This sound is then processed by a complex computer algorithm that simulates how the sound would behave if it was occurring in a simulated room. This sound is then precisely distributed and tuned to small loudspeakers located to simulate the room you want to mimic.
  • Room tunings and character can be changed at will. To the audience, it is entirely natural.  It just sounds as if they are in a different room.
  • When the orchestra takes the stage, the room gets larger and has added bass extension. The choral group gets a longer reverb time with added midrange clarity.  For speech, the system switches to a voice lift mode and can improve intelligibility.
  • All of this is controlled by  simple presets: Choral, Organ, Speech etc…

In order for electronic acoustics to work, the ROOM itself needs to be designed carefully from an ACOUSTIC standpoint, but in a different fashion.

Discrete echo has to be controlled. The enhancement system works with the room acoustics, but cannot cancel out physical acoustic defects.

Successful implementation of electronic acoustics requires coordination of the system elements with lighting, ceilings, walls, HVAC, plumbing and other elements throughout the design process. HVAC noise has to be very carefully controlled.  Led lighting (much of which is now fan cooled) has to be chosen and placed very carefully relative to microphone locations.

https://www.youtube.com/watch?v=Te5lPxzVR4E

The Physical acoustic conditions have to be designed to work with the system. This is not a sound system, it is an acoustic system and placement of all elements are critical relative to the room in which it is employed.

The results are well worth the effort. Performances are enhanced and audiences experience an enveloping detailed sound quality in auditoriums that were previously not.

Copyright AVLDesignsInc 2021+

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SUNY Cobleskill auditorium renovation #acoustics #audio #lighting #rigging #design

State University of New York at Cobleskill

AVL Designs Inc. recently completed a multi-faceted project at the State University of New York at Cobleskill.

The project consisted of a renovation of a lecture hall and a gymnasium field house. The lecture hall space is now being used for more multipurpose events including music, standup comedy, small theater presentations and video conferencing.

SUNY Cobleskill auditorium renovation #acoustics #audio #lighting #rigging #design

AVL Designs Inc. was contracted by the architect to provide acoustic design, audio system design, stage rigging, curtains, lighting and controls as well as video presentation capabilities for their new lecture hall.

Before and after photos show you the extent of the renovation, which was substantial.  In essence, it was a “full gut” of the space.

The gymnasium/field house had two issues. One was extremely live acoustics making the room unsuitable for many uses. Graduation and other events are performed in the gymnasium and the sound quality was quite poor. The primary reasons for this were twofold. One contributing factor was the acoustical condition of the room and the other was the sound system itself.

The old system suffered from poor intelligibility due to comb filtering. This was a result of a poor design not poor devices. The new design includes Danley loud speakers which are used for both bleachers and general court area audio. A fully distributed system over the court is used for events such as graduation. Acoustical treatment has been added throughout the gymnasium to reduce reverberation time and to minimize first reflection energy from the sound system.

Both spaces were ready for use early this year and have been well received by the clients and their guests.

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Copyright AVLDesignsInc 2021+

 

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