Rockford Fosgate 125.2, Operation & Installation

Page: 33 / 48

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 signal
which is input to it identically but with increased volume. It will be connected
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 voltage
regardless of load characteristics and will not alter the signal it is reproducing.
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!
– 30 –
–60
°
(Cap)
0
°
(Ind) +60
°
1
Ω
2
Ω
4
Ω
Impedance
8
Ω
10V
30V
50V
8
Ω
–60
°
–30
°
0
°
30
°
60
°
4
Ω
–60
°
–30
°
0
°
30
°
60
°
2
Ω
–60
°
–30
°
0
°
30
°
60
°
1
Ω
–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
VOL
T
AGE
*
*
*
*
PHASE ANGLES
{
POWER
IN
WATTS
{
{
• Example of a Punch 200.
2
PowerCube