CTS Math

Question 1

Calculate screen diagonal

Answer 1

A squared + B squared = C Squared

Question 2

dB formula for Distance

Answer 2

dB=20 log(D1/D2). If the distance increases, D1/D2 should be <1 to get a negative dB

Question 3

Power Formula

Answer 3

P=I*V Power = Current x Volts

Question 4

Parallel Resistance

Answer 4

If all speakers have the same resistance Zt=Z1/N Total resistance = Resistance of one of the speakers / total number of speakers.
If resistance is mixed Zt=1/((1/Z1)+(1/Z2)+(1/Z3)…)

Question 5

Heat formula

Answer 5

BTU=P*3.4

Question 6

Determine the image height for a given level of screen detail

Answer 6

Height=Furthest viewer / 4, 6, or 8
4=detailed inspection
6=detailed viewing
8=general viewing

Question 7

Ohm’s Law

Answer 7

V=I*R. Volts = Current x Resistance

Question 8

Aspect ratio

Answer 8

W/H

Question 9

dB formula for Power

Answer 9

dB=10 log(P1/P2). If the power increases, P1/P2 should be >1 to get a positive dB

Question 10

What is the speed of sound

Answer 10

344m/s

Question 11

Distance given the throw ratio

Answer 11

Distance = Screen width * Throw ratio

Question 12

dB formula for Voltage

Answer 12

dB=20 log(V1/V2). If the voltage increases, V1/V2 should be >1 to get a positive dB

Question 13

Bandwidth formula

Answer 13

Total pixelsframe rate/23

Question 14

Determine the max. viewer distance given the text size

Answer 14

D=text height x 150

Question 15

Series Resistance

Answer 15

Z1+Z2+Z3….

Question 16

How do you calculate speaker resistance in a mixed series/parallel layout?

Answer 16

Calculate the resistance of each series branch, then use the parallel formula