# Useful Tools 'N' Things

Viewing Distance Calculator

Scanning Frequency and Bandwidth Calculator

This calculator will compute the predicted maximum sound pressure level (loudness) at the listening position. Four pieces of information are required, plus one optional input:

Horizontal Scanning Frequency and Bandwidth Calculator

Projection Calculator Pro

Will your projector fit the available space? What about your screen? What about seating and room lighting? To find out, use our Projection Calculator Pro by following these 2 easy steps:

The Reverberation Calculator

This page will calculate reverb time for the home theate room you input here.

Room Mode Calculator

This JavaScript calculator will determine the Axial, Tangential and Oblique room modes of regular rectangular shaped rooms with uniform wall construction.

Wire Gauge Calculator

Type in the power output of the amp, the impedance of the cabinet or speaker, and the length of the speaker cable you want to run. The answer will be the gauge of the stranded wire you should use for the speaker cable. This calculator is limited to 500 watts, greater than 2 ohms, and cable lengths not to exceed 20 feet.

Amplifier Power Calculator

How big a power amplifier do you need to fill a venue with loud, clear sound? A louder sound system and a bigger room requires more power. Loudspeakers with high sensitivity need less power than loudspeakers with low sensitivity. Empirical evidence shows that peak power is really only about 1dB higher than continuous power, and depends on peak duration.

Screen Size Calculator

What’s the right screen size for a particular viewing distance? What’s the best distance to watch a certain sized tv? Since standard definition televisions always have a screen ratio of 3:4, and high definition (wide screen) tv’s are always 9:16, you only fill in one field for the column and the rest will be computed. The number that you enter will appear in red. The calculated numbers will be black. Screen size calculations need to be adjusted to a size that is actually available from a manufacturer. If you use inches for your input value, the other measurements will also be in inches. The same is true for feet, centimeters, etc.
Note: The high def values are “ideal” because they don’t take into consideration watching a standard definition show on the same set. The “compromise” values adjust the screen size or the viewing distance to improve the picture when a high def set shows a standard def picture.

Home Theater Riser Platform Calculator

Use this calculator to determine the height of your home theater riser.

Tilt and Keystone Distortion Calculator for Projectors

This Javascript calculator determines the amount of tilt or pitch needed to raise a projected image a given height. It also determines the resulting keystone image distortion. These can be important considerations, particularly for rooms with low ceilings and high offset projectors.

Everything You Wanted to Know About SPL Meters

How to use this handy device to calibrate loudspeaker levels and measure
frequency response in a room.

Very Handy, Thanks