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Information Cubed
The data acquired in the testing procedure is then graphed in the form of a
3-dimensional cube, hence the name PowerCube.
The Phase Angle is expressed on the horizontal axis, the Output Voltage is
presented on the vertical axis and the Impedance is displayed on the Z axis.
Output Power, in watts, is listed on the left hand side for each impedance
at each phase angle.
What is an Amplifier?
An amplifier by definition is a voltage generating device, recreating the sig-
nal which is input to it identically but with increased volume. It will be con-
nected to a reactive load (the speaker). The impedance of this load and
phase of the signal passing through the load will vary, dependent upon the
frequency of the input signal (music).
Therefore, a perfect amplifier will be able to maintain the same output volt-
age regardless of load characteristics and will not alter the signal it is repro-
ducing. A perfect amplifier when measured by the Audio Graph PowerCube
would present data that forms a perfect cube. Unfortunately, amplifiers are
not perfect. The laws of physics generally prevent it. A great amplifier is
about the best one can hope to attain.
As you can see by the PowerCube and as you will experience by listening,
your Punch amplifier is a GREAT AMPLIFIER!
–60° (Cap)
0°
(Ind) +60°
1Ω
2Ω
4Ω
Impedance
8Ω
10V
30V
50V
8Ω –60°
–30°
0°
30°
60°
4Ω –60°
–30°
0°
30°
60°
2Ω –60°
–30°
0°
30°
60°
1Ω –60°
–30°
0°
30°
60°
85 W
84 W
84 W
84 W
86 W
162 W
157 W
156 W
157 W
162 W
273 W
258 W
251 W
256 W
271 W
390 W
356 W
346 W
352 W
390 W
Audio Graph – The PowerCube™
Amplifier:
Serial No:
Owner :
PUNCH 200.2
14.4V x 2
ROCKFORD CORPORATION
Rated Power : 100 W @ 4 Ohms
IMPEDANCE
MODEL BEING
TESTED
x2 = STEREO
MONO = BRIDGED MONO
VOLTAGE FROM
BATTERY
OUTPUT VOLTAGE
*
*
*
*
PHASE ANGLES
{
POWER
IN
WATTS
{
{
• Example of a Punch Amplifier PowerCube