Six criteria in selecting a Motorized Screen

Space comes at a high cost and using it for multiple purposes is a good choice for your business, church, hotel or theater.  A motorized projection screen that rolls up and down is a great choice to free up space for other needed uses.

These are the top six considerations in selecting a motorized screen:

1. Size


The ideal size depends on the space and the aspect ratios (shape) of the content that will be displayed.

  • Image Height: specify as much image height as can fit.  Limitations include the ceiling height, furniture and presenters who may need to stand in front of the screen.
  • Image Width: rarely will only one aspect ratio of content be displayed.  There will be videos, presentations, movies of all shapes.  Consider how differing aspect ratios will appear on a given screen and select the best compromise.
2. Material Choice
  • Low Gain screens: selected for light controlled environments.
  • High Gain screens: used to enhance brightness when projectors have insufficient light output and limited viewing angles are not an issue.
  • White screens: chosen for their light dispersion qualities, wide viewing angles, and lower cost.
  • Grey screens: selected to preserve contrast levels and provide deeper color saturation.  Grey screens are also used in rooms with high ambient light.
  • Ambient light rejecting (ALR) screens: designed to redirect off-axis light (light other than that emitting from the projector) away from the viewer’s field of vision and to absorb indirect light.  ALR screens are used in rooms with high ambient light.
  • Black screens: perform best in environments with high ambient light and should be used in conjunction with powerful projectors that provide high lumen output.
  • Other screen materials are available for specific purposes.  Some materials are offered with black backing to absorb intrusive background light, such as light coming from windows.
3. Tensioning
  • Side tensioning allows the screen material to be completely flat from side to side.  The result will always be a better screen.
4. Position
  • Case Height: may be set by the level of the finished ceiling, the height of a beam or a position on the wall that is ideal for placing the screen’s case/housing.  The cases can be hidden or visible. Hiding screen cases involves recessing the case into a ceiling or soffit or masking the case with a cosmetic treatment.  Cases typically come in white or black finishes.
  • Image Above Finished Floor: the bottom of the image needs to be positioned so that all viewers can see it and should also be positioned so viewing is comfortable.
5. Borders
  • Bottom border: in some situations, an extra-long bottom border can be required to hide furniture or speakers that will be behind the screen or to simply bring the screen down to floor level for cosmetic reasons.  In these circumstances, determine the extra bottom border length and include that in your design.
  • Top Drop: when the distance from the bottom of the image to the bottom of the case is greater than the image height, the difference is filled with top black drop border.  Ideally, the image is positioned so that the average viewer is not forced to look up too much to see the whole screen.  In these circumstances, determine the extra top drop length and include that in your design.
  • Side Borders: the width of the side borders is cosmetically decided.  A motorized tab-tensioned screen’s overall width must be at least 1.33x the overall height.  When there is a lot of top drop, side borders may need to be expanded.
6. Speaker Location
  • If the speakers are placed behind the screen to increase the realism and immersive experience, then an acoustically transparent material will be needed.

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Resimercial HDMI problems

After an installation with HDMI cables is completed and all the equipment is connected, if there is no picture, the installer will need to expend time searching for the problem.

Resetting the units will sometimes solve the problem, but many times it is not fixed.  The installer will need to contact the manufacturer to replace the devices.

A lot of labor and time has been wasted!
Most of the HDMI system problems are classified into two types:
  • Communication problems caused by EDID handshake or HDCP copyright
  • Signal strength problems caused by cable being too long

Luxi Electronics offers simple solutions that the integrator should always consider carrying on the jobs.


To fix communication problemsLuxi HDMI Communicator will change the sequence and timing to avoid conflict.


To fix signal strength problemsLuxi HDMI Extender will boost the signal.

Carry one of each. One of them will fix the problem!
Plus a spare 5 V power adapter, just in case!

No external power! 
The Extender never needs power.
The Communicators only sometimes.

Simple installation!

Courtesy of Luxi Electronics


Consider glass made loudspeakers

Speakers are normally built out of wood as are musical instruments! But not all musical instruments are made of wood, such as saxophones, trumpets, cymbals etc.. In a violin or a guitar, the wooden body participates in the pitch and sound by vibrating.

In the case of a loudspeaker, it is the movement of the driver and not the vibration of the cabinet that produces the sound. In fact, cabinet vibration erodes audio quality.

A speaker should have a rigid structure… and glass provides that!

The highly interesting choice of a loudspeaker made of glass is not just for its aesthetic qualities, but also for its extreme density. There is no cabinet vibration to alter the PURE sound reproduction.


Consider Waterfall Audio Glass Speakers in your next project!

Courtesy of Waterfall Audio

Best Practices for Ceiling Mic Installations

Customers like ceiling microphones for a variety of reasons — no cables on the table, no drilling holes in tables, a more aesthetically pleasing design and freedom to move around the room.

Many technological advancements and improvements in microphone design make it possible for ceiling microphone quality to be as good, if not better, than tabletop mics in many environments.

The ceiling tile surrounding the microphone enhances low-frequency response, making voices sound more natural than tabletop microphones.

Best Practices for Ceiling Microphones Installations

Develop an acoustical model
An acoustical model is based on room dimensions, materials, application, and acoustics.  It will help to determine whether ceiling microphones are appropriate for the room, the number of mics needed, and where they should be placed to deliver the desired coverage.

Figure 1: Room 34’ x 19’  /  Figure 2: Room 23’ x 21’
Even though one room is larger, with a larger table, the rooms require the same number of mics to achieve the desired coverage. If an acoustical model had not been developed, the larger room would have been over miked.


Minimize ceiling noise
HVAC air movement from the ceiling creates noise that is extremely hard to remove from the audio path.  Only the mixers with sophisticated algorithms with individual per-channel processors can reduce the noise without generating audible artifacts.  Because air vents push air down toward the floor, flush-mount ceiling microphones have a natural advantage over hanging mics since they are mounted out of the air path and are not impacted by this type of noise.

Configure microphone settings for best performance
Mics must be configured for the mixer to which they are connected in order to perform as intended.  It is important to consider the mixer input sensitivity, which for most ceiling-installed mics tends to be higher than for tabletop or gooseneck mics.  All professional mixers that support multiple mic types allow the setting of proper mic sensitivity.

Create zones for voice lift
Voice lift is the concept of allowing participants in large rooms to hear each other within the room.  A technique used to accomplish this is to divide a large room into two or more zones for speakers and mics.  The mics in each zone feed the speakers in the other zones, thus minimizing the occurrence of feedback.  Voice lift is often used in rooms where participants may be more than 30 feet apart.

Test system to ensure quality
On completion of installing the equipment, the performance of the system needs to be evaluated.

Hanging microphones were designed to close the talker-to-element distance.  This reduces the pickup pattern area, requiring more mics for a specific room adding complexity and noise into the system.  In addition, that hanging microphones are more sensitive to air motion, which creates white noise in the background.

Consider Flush Ceiling Microphones!!!

Courtesy of CTG Audio