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Biamp Systems

System Design Template - Small hotel ballroom with auxiliary inputs, TEC-1 control

This system design template shows how Tesira products can be used in a small hotel ballroom room installation. A typical ballroom can be setup to accommodate distributed and/or stereo audio throughout the space from a number of auxiliary room input locations along with selectable background music sources. 

In this small hotel ballroom example, we will be setting up a flexible audio system utilizing the TesiraFORTÉ AVB AI hardware with a wall mounted TEC-1 user control interface. The ballroom will consist of a single-room system with two aux wall plate locations with a mic level and line level inputs at each. These sources will be mixed together and sent to the distributed or stereo room speakers outputs as required for the specific design. There will be two background music sources available to the ballroom system with source selection and level control. The application will also include a pre-function area audio feed to distributed ceiling speakers with the ability to select background music sources, or ballroom audio for overflow purposes. The system can also be muted by a contact closure trigger from the fire alarm panel. 

Room design

conf system diagram.PNGBallroom Functionality Scope:

  • Two auxiliary analog input locations in the room supporting both Mic or Line level signals, with available routing to either ceiling or stereo speakers. 
  • Two selectable analog background music inputs to system.
  • 70V distributed ceiling speaker feed to support speech reinforcement and/or BGM sources.
  • L/R speaker system in room to support stereo input sources. 
  • Pre-function area 70V distributed ceiling speaker system, with source selection of background music sources or ballroom audio. 
  • System level and source select control via wall mounted TEC-1 wall panel. 
  • User interface for advanced control and routing via Biamp Canvas software
  • System logic inputs to trigger system mute to all areas from third-party fire/emergency contact closure.

Equipment list

Below is the list of Biamp equipment used in this project:

  • 1 - TesiraFORTÉ AVB AI      12 mic/line level inputs; 8 mic/line level outputs with integrated USB audio
  • 1 - Tesira TEC-1                   Tesira PoE Ethernet control device: in-wall/surface mount   
  • 2 - AMP-460H                     4-Channel, 60W class D amplifier; supports both 70V and  100V constant-voltage speaker systems
  • 1 - PH POE36U-1AT-R         Gigabit PoE+ Injector, IEEE802.3af compliant, IEEE802.3at, PoE capable network switch, or equivalent PoE injector

Note that other non-Biamp equipment is required, including the microphones, speakers, background music sources, stereo program source device, network switch, and fire alarm panel interface.

Example file

Small ballroom BGM and AUX w Tec-1 Snip.png

The example file for this system design template is set up with all the analog audio I/O, processing, and control points required for the functionality scope, and is ready to load to the system. In the file, the matrix routing is setup for microphone inputs and background music to be fed to the distributed speaker system while line level aux inputs are routed to the stereo speakers. These routes may be changed or modified as needed to fit specific the design application.

The file's Equipment Table is populated with proper hardware to match the layout, but will need to have serial numbers and proxy host assignments added before loading the file to system. The file download includes an optional Canvas control file that can be used for advanced routing and control of the system if required. The TEC-1 controller is setup with a multi-page configuration with a home navigation page, and additional user controls available on sub pages. 

The .zip file below contains the example Tesira and Canvas configuration files for this hotel ballroom application.     

File Download: Small hotel ballroom with BGM and auxiliary inputs, TEC-1 control

Networking details

The sample small ballroom application will make use of only the control network interface of the hardware to achieve a fully functioning room environment. We have included AVB capable hardware in the design to allow for future expansion, but are not implementing AVB in this application. This system is small enough to be placed on a very small local AV switch, but is also equally capable to be integrated into a larger building network sharing larger switches for control traffic. For a more detailed guide on how to implement in a larger range of network applications, it would be helpful to reference our Tesira Network Infrastructure article.

Both hardware devices will need to be discovered in Tesira software before the configuration can be sent. The PC must have a unique IP address in the same subnet as the TesiraFORTÉ device. A TesiraFORTÉ device is configured from the factory with DHCP or Zero Conf (Link Local) address. If you wish to verify your PC network interface is set correctly, please review the Setting an IP address section. More details of system connections can be found here

Setup Requirements:

  • Control network switch with sufficient ports and PoE capable port(s)
  • 802.3af (Class 1) PoE injector for powering the TEC-1 controller or PoE capable port. TEC-1 requires 3.2W @ full display utilization.
  • Connection to Owner PC and network for Canvas user interface control.

Audio setup

  • Follow Gain Structure best practices to set input and output levels of microphones and sources. Input and output gain levels have been left at default settings for integration flexibility of the file. Input and Output metering has been added to assist with setting gain structure within the file. Additional meters can be added to the file as required to allow for additional detail at point along the signal path. 
  • Upper and lower limits have been added to level blocks for user facing controls. These can be adjusted to fit the design application as needed.
  • Note that the file has two auxiliary input locations available with mic level and stereo line level inputs at each. These input types may be modified as needed to fit the space requirements.
  • Select constant voltage (CV) and bridging on amplifier channels to support room speaker topology. Refer to room design signal flow diagram for more details. 
  • Uber Filters and Limiters have been added to all signal paths to allow for any additional equalization and signal management as needed to sources. Additional filtering or dynamics blocks may be added or changed as needed to achieve the desired results in the file. 
  • A graphic EQ block has been added to all speaker outputs to allow for room tuning and equalization. For a more detailed guide on room optimization, see our equalization guide.
  • Logic for fire alarm muting is setup to mute all audio paths for the duration the contact closure is closed. This functionality may be modified as needed to fit exact room requirements, or removed if not needed.
  • Changes to the matrix mixer can be made as needed to allow for appropriate sources to feed the stereo and distributed speaker zones to fit the design application.

System control

TEC-1 Setup: The TEC-1 wall mounted controller in this system is a standard Ethernet device and requires 802.3af Class 1 PoE. The default network configuration of a TEC-1 is DHCP, so if there is no DHCP server on the Tesira network the units will revert to link local addressing schemes (169.254.xxx.xxx, netmask 255.255.0.0). The TEC-1 will display "Waiting for Configuration..." on the screen until a configuration file has been loaded to the Server associating it by its Device ID. The Device ID of the TEC-1 is used to associate the block with the physical TEC-1, so it needs to be set in two places: the TEC-1 processing block and in the TEC-1 hardware. TEC-1 Controller has been setup with a multi page configuration with the main selections on a home screen and specific controls on sub pages. Additional info on multi page setup can be found here and includes guides for the RED-1 controller that can also be applied to the TEC-1 programming. 

Biamp Canvas Sofware: An optional Biamp Canvas configuration layout has been provided for this application to be used as an additional point of control for the system integrator or operator. This is an optional part of the system, and is not required for the operation of the file. This Biamp Canvas layout is setup with basic controls for the system to allow for level adjustment, source selection, routing, and muting. It is created as a starting point and may be modified as needed to fit exact needs of the design application. The Canvas help file can be found here for reference. 

Control System Integration: The example Tesira configuration file for this system design template has been setup to allow third-party control systems to easily control the Tesira system if desired. There are control points for Level, Mute, and Source Selection already in place to allow for you to use as it as-is, or add to as needed to suit the needs of the design. Control points within the file have been left at the default instance ID tag. These tags can be changed as needed to suit the programmer workflow or standardization.

Fire Alarm mute logic

In this application, we have added logic to control muting of the system on a contact closure from the fire alarm or other system. This logic is an optional feature of the file, and may be removed if not needed.

When connecting this fire alarm wiring to a Tesira system, it is important to know whether the switch is normally-open or normally-closed.

On a Tesira logic input, a short circuit will create a low logic signal (i.e., off), and an open circuit will create a high logic signal (i.e., on). Therefore, normally-closed mute switches create normally-low logic signals, and normally-open mute switches create normally-high logic signals.

Tesira logic blocks usually work best with normally-low logic signals.  So, if you are working with normally-open switches, you'll usually need to either put the logic signal through a NOT gate, or just enable the Invert button in the Logic Input block.

It is important to note, it the shown configuration, the fire alarm mute will only mute the room and pre-function audio to allow audio from the fire alarm or evac system to be heard. The shown configuration does not have a path for an announcement from those systems to be played over the speakers. This functionality that may be added if needed with modifications to the file.