Exertis Almo Calculators

Exertis Almo's in-house system design experts have you covered with tools to deliver impeccable visual and sound experiences. Whether you're working with a screen, flat panel, or LED wall, or even designing a sound system, the tools below will help you answer questions such as: How big does an image need to be? Where should the viewers be located in relation to that image? Will my sound reinforcement system be free from feedback?

Using the calculator is as easy. 1. Select a calculator from the tabs below. 2. Fill in the fields with the measurements/data. 3. Results will be automatically calculated and displayed in the gold fields.

For commentary and diagrams, click on the help icons.

Display Sizing and Viewer Distances | Basic Decision Making (BDM)

Enter Farthest Viewer Distance.

Feet:

Inches:

- OR -

Enter Image Diagonal Size.

Inches:

Enter Aspect Ratio.

Width:

Height:

Enter %Element Height (%EH) Default is 3%.

Percent:

Enter Distance from Floor to Top of Image.

Inches:

Enter Eye Height.

Inches:

Enter Ambient Light Measured at Screen Location.

Foot-Candles:

Enter Desired Contrast Ratio.

Ratio:

Results

Image Size (in Inches).

Diagonal:

Height:

Width:

Image Area (in Square Feet).

Sq. Ft.:

Farthest Viewer.

Feet:

Inches:

Closest Viewer.

Feet:

Inches:

Minimum Element Height.

Inches:

Projector Lumens Needed.

Lumens:

Viewer Distances and Pixel Pitch | Analytical Decision Making (ADM)

The ANSI/AVIXA V202 standard as well as other resources use an Acuity Factor of 3438 for ADM. This is the ability to resolve every element (pixel) of a displayed image. The AVIXA standard for ADM defines the FV, meaning that anyone closer than the FV distance can resolve pixel level detail. This would also be the same as the CV distance for dVLED pixel pitch.

Enter Diagonal.

Inches:

Enter Resolution.

Horizontal:

Height:

Enter Aspect Ratio.

Width:

Height:

Results

Farthest Viewer.

Inches:

Pixel Pitch (in mm).

Millimeters:

Pixel Pitch (in inches).

Inches:

Potential Acoustic Gain (PAG) | Needed Acoustic Gain (NAG)

This calculator uses distances to compare the Potential Acoustic Gain (PAG) of your sound system with the Needed Acoustic Gain (NAG) of your system. Enter the Distances and if the Result is 0 or Greater, the System will be Considered Stable.

Enter Distance from Loudspeaker to Microphone.

D1:

Enter Distance from Loudspeaker to Listener.

D2:

Enter Distance from Microphone to Source.

Ds:

Enter Equivalent Acoustic Distance.

EAD:

Enter Number of Open Microphones.

NOM:

Enter Feedback Stability Margin ("6" is the default value).

FSM:

Results

dB:

General Calculator & Converter

Difference in Decibels:

If you expect a reduction in dB, put the smaller number first. If you expect an increase in dB, put the larger number first.

Calculate the dB Difference in Power:

Enter P1:

Enter P2:

dB:

Calculate the dB Difference in Distance:

Enter D1:

Enter D2:

dB:

Calculate the dB Difference in Voltage:

Enter V1:

Enter V2:

dB:

Conversions:

Convert dBu to Voltage:

Enter dBu:

Volts:

Convert Voltage to dBu:

Enter Voltage:

dBu:

Convert dBV to Voltage:

Enter dBV:

Volts:

Convert Voltage to dBV:

Enter Voltage:

dBV:

Convert dBu to dBV:

Enter dBu:

dBV:

Convert dBV to dBu:

Enter dBV:

dBu:

Convert lux (lx) to footcandles (fc):

Enter Lux:

FC:

Convert footcandles (fc) to lux (lx):

Enter FC:

Lux:

Ceiling Loudspeaker Design

Ceiling Mounted Loudspeaker Spacing (Minimum Overlap):

Enter Disperson Angle¹:

Angle °:

Enter Ceiling Height²:

Feet:

Enter Ear Height³:

Feet:

Diameter of Coverage Circle at Ear Height:

Feet:

Spacing Between Loudspeakers:

Feet:

¹ The -6 db spec from a Polar Plot is not the same as being -6 dB down on the Listening Plane.

² If using Pendant loudspeakers, use Pendant height.

³ Seated Ear Height is considered to be 4 feet (48 inches). Standing is considered to be 5.2 feet (62 inches).

EPR for Tap Wattages on 70 V Loudspeaker Lines (using loudspeaker information above):

Desired SPL:

dB:

Headroom:

dB:

Loudspeaker Sensitivity:

dB:

Listener Distance at Edge of Coverage:

Feet:

EPR:

Wattage:

Actual Tap Wattage Used:

Wattage:

Quantity of Loudspeakers:

Qty:

Minimum Amplifier Wattage Required:

Wattage:

Exertis Almo Calculators

Display Sizing and Viewer Distances | Basic Decision Making (BDM)

Enter Farthest Viewer Distance.

Enter Image Diagonal Size.

Enter Aspect Ratio.

Enter %Element Height (%EH) Default is 3%.

Enter Distance from Floor to Top of Image.

Enter Eye Height.

Enter Ambient Light Measured at Screen Location.

Enter Desired Contrast Ratio.

Results

Image Size (in Inches).

Image Area (in Square Feet).

Farthest Viewer.

Closest Viewer.

Minimum Element Height.

Projector Lumens Needed.

Viewer Distances and Pixel Pitch | Analytical Decision Making (ADM)

Enter Diagonal.

Enter Resolution.

Enter Aspect Ratio.

Results

Farthest Viewer.

Pixel Pitch (in mm).

Pixel Pitch (in inches).

Potential Acoustic Gain (PAG) | Needed Acoustic Gain (NAG)

Enter Distance from Loudspeaker to Microphone.

Enter Distance from Loudspeaker to Listener.

Enter Distance from Microphone to Source.

Enter Equivalent Acoustic Distance.

Enter Number of Open Microphones.

Enter Feedback Stability Margin ("6" is the default value).

Results

General Calculator & Converter

Difference in Decibels:

Calculate the dB Difference in Power:

Calculate the dB Difference in Distance:

Calculate the dB Difference in Voltage:

Conversions:

Convert dBu to Voltage:

Convert Voltage to dBu:

Convert dBV to Voltage:

Convert Voltage to dBV:

Convert dBu to dBV:

Convert dBV to dBu:

Convert lux (lx) to footcandles (fc):

Convert footcandles (fc) to lux (lx):

Ceiling Loudspeaker Design

Ceiling Mounted Loudspeaker Spacing (Minimum Overlap):

Enter Disperson Angle1:

Enter Ceiling Height2:

Enter Ear Height3:

Diameter of Coverage Circle at Ear Height:

Spacing Between Loudspeakers:

EPR for Tap Wattages on 70 V Loudspeaker Lines (using loudspeaker information above):

Desired SPL:

Headroom:

Loudspeaker Sensitivity:

Listener Distance at Edge of Coverage:

EPR:

Actual Tap Wattage Used:

Quantity of Loudspeakers:

Minimum Amplifier Wattage Required:

Sitemaps

Downloads

Enter Disperson Angle¹:

Enter Ceiling Height²:

Enter Ear Height³: