Rockford Fosgate 40X2 manual Information Cubed, What is an Amplifier?

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.

Audio Graph – The PowerCube™

		MODEL BEING			VOLTAGE FROM	x2 = STEREO
		TESTED
					BATTERY	MONO = BRIDGED MONO
	Amplifier: PUNCH 200x2 14.4V x 2					Rated Power : 100 W @ 4 Ohms
	Serial No:
	Owner	: ROCKFORD CORPORATION
	8Ω *–60°	85	W
	–30°	84	W		POWER
	0°	84	W
					IN
	30°	84	W	{ WATTS
E	60°	86	W
C	4Ω *–60°	162	W
N	–30°	157	W
A
	0°	156	W
D
	30°	157	W
P E
	60°	162	W
M	2Ω *–60°	273	W
I	–30°	258	W
	0°	251	W					4Ω
	30°	256	W
	60°	271	W		–60°(Cap)			2Ω
	1Ω *–60°	390	W			0°	1Ω	{
	–30°	356	W			(Ind) +60°
	0°	346	W		PHASE{ANGLES			Impedance
	30°	352	W
	60°	390	W

•Example of a Punch 200x2 PowerCube

50V

30V

10V

8Ω

O U T P U T V O L T A G E

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 gener- ally 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!

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