4 General Technical Information Page 103
4.6 Essentials
4.6.1 Load-to-Power Relation in 100 V Systems
10 Ω = 1000 W 20 Ω = 500 W 25 Ω = 400 W
40 Ω = 250 W 50 Ω = 200 W 100 Ω = 100 W
4.6.2 Crest Factor
The Crest Factor of an amp represents the relation between the peak voltage and the RMS value. It can be
taken as a measurement of the quality of the response of an amp.
Crest F actor =
P eak
RM S
=
1
√
2
× P eak
4.6.3 Resistance - Power
Ohm’s Law:
U = I × R I =
U
R
R =
U
I
Power:
P = I
2
× R P =
U
2
R
W = U × I
Resistors in series:
R
total
= R
1
+ R
2
+ ... + R
n
Resistors parallel:
R
total
=
1
1
R
1
+
1
R
2
+ ... +
1
R
n
4.6.4 Voltages in dBV and dBu
10 V = 20 dBV = 22.2 dBu
1.55 V = 4.2 dBV = 6 dBu
1 V = 0 dBV = 2.2 dBu
775 mV = −2.2 dBV = 0 dBu
316 mV = −10 dBV = −7.8 dBu
4.6.5 „dB“-Relations
Voltage: dB = 20log
10
U
1
U
2
Power: dB = 10log
10
P
1
P
2
c
2016 Bittner Audio Int. GmbH
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