Rockford Fosgate 250 - Manual (Page 29)

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!
– 24 –
–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