Rockford Fosgate Punch 40I Owner's Manual page 22

Information Cubed
The data acquired in the testing procedure is then graphed in the form
of a 3-dimensional cube. Hence the name
Angle
The Phase
Voltage
is presented on the vertical axis and the
displayed on the Z axis.
hand side for each impedance at each phase angle.
MODEL BEING
TESTED
Amplifier: PUNCH 200ix 14.4V x 2
Serial No:
Owner : RCCKFORD
84 w
159 W
a
266 w
- 3 0 " 251 w
60" 261 w
- 3 0 " 343 w
30" 339 W
' *If a Bridged/Mono, test amplifier sees 1/2 impedance (2micron test amp sees 1micron)
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
AudioGraph 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!
is expressed on the horizontal axis, the Output
Output Power,
Audio Graph - The PowerCube
VOLTAGE FROM BATTERY
I
x2= STEREO MONO=BRIDGED
CORPORATION
WATTS
"MOTION OF
SPEAKER"
- 19 -
PowerCube.
Impedance
in watts, is listed on the left
MANUFACTURERS
RATED OUTPUT
/
Rated Power : 75W at 4 Ohms
is