N a M I C P O W E R M E a S U R E M E N T S

D Y N A M I C P O W E R M E A S U R E M E N T S

About the Dynamic Power Measurements

The Audio Graph PowerCube is a test instrument used to measure the output of an amplifier in accordance with IHF-202 industry stan- dards. The IHF-202 standard is a dynamic power measurement and was developed as a means of measuring power in a manner that best represents the Real World operation of an amplifier. Many manufac- turers, including Rockford Fosgate, at times will measure amplifier power into a fixed resistor (4 Ohm, 2 Ohm). While this method is useful in some types of evaluation and testing, it is not representative of an amplifier that is connected to a speaker and playing music.

Music

Music is dynamic; the sound waves are complex and constantly changing. In order to simulate this, the IHF-202 standard calls for the input signal to the amplifier to be a 1kHz bursted tone. This signal is input (on for 20 milliseconds) and reduced 20dB for 480 millisec- onds. The signal is gradually increased in level until the amplifier's output exceeds 1% Total Harmonic Distortion (THD). At 1% distor- tion becomes audible, therefore, any power produced above that level is considered not usable. Many manufacturers represent their amplifiers' output power in excess of 10% distortion. They use many names for this measurement, such as Total Maximum Power or Maximum Output Power. This is not indicative of the actual usable output power.

Listening to Loudspeakers - Not Resistors

A loudspeaker is not a resistor. A resistor's value (resistance measured in ohms) is fixed. A loudspeaker's impedance is dynamic. It is constantly changing in value, dependent upon the frequency of the input signal. Therefore, measuring power with the amplifier loaded into a 4 ohm resistor is not the same as measuring power with the amplifier connected to a 4 ohm speaker. Most people do not listen to music through a resistor.

A 4 Ohm speaker may experience a drop in impedance 4-6 times lower than its nominal (printed) impedance. A speaker will also create phase shifts in the signal that is passed through it. These phase shifts happen because a speaker is an inductor (voice coil) and a capacitor (compli- ance of the surround/spider), as well as a resistor (voice coil wire).

To simulate a speaker the Audio Graph PowerCube measures output power into 20 different loads. It tests at 8 Ohms, 4 Ohms, 2 Ohms and 1 Ohm. Each of these impedances is also tested at –60° , –30° , 0° , +30° and +60° phase angles. These different impedances and phase angles represent the shifts in impedance and phase that can occur in a typical loudspeaker.

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100ix, 200ix, 60ix, 40ix specifications

Rockford Fosgate is a revered name in the world of car audio, known for its high-performance amplifiers intended to enhance the audio experience in vehicles. Among its extensive lineup, the 40ix, 60ix, 200ix, and 100ix models stand out for their distinctive features, cutting-edge technologies, and versatile applications.

The Rockford Fosgate 40ix is an exceptional choice for those seeking a compact yet powerful amplifier. With a power output of 40 watts RMS per channel, this model is perfect for smaller systems and delivers exceptional sound clarity. It utilizes Rockford Fosgate's patented Constant Power technology, ensuring that it maintains peak performance under various load conditions. Additionally, the 40ix boasts a sophisticated MOSFET power supply that maximizes efficiency, resulting in less heat generation.

Moving up the lineup, the 60ix offers an upgraded output of 60 watts RMS per channel, ideal for users looking to drive larger speakers. This amplifier features low-pass and high-pass crossover filters, allowing users to tune their sound to perfection. The incorporation of a variable bass boost enhances low-frequency response, making it a favorite among bass enthusiasts. The 60ix is built with durable components, designed to endure the rigors of automotive environments.

The Rockford Fosgate 100ix takes power to another level, offering 100 watts RMS per channel. This amplifier is engineered for serious audio aficionados, providing ample power to drive subwoofers and high-performance speakers. Its advanced Thermal Protection Circuitry prevents overheating, ensuring reliable operation even during extended listening sessions. The 100ix also features remote bass control, giving users the flexibility to adjust bass levels on the fly.

Finally, the 200ix stands as the powerhouse of this group, delivering an impressive 200 watts RMS per channel. This amplifier is perfect for those who demand the ultimate audio experience, capable of accommodating multiple subwoofers and larger speaker setups. With Rockford Fosgate's proprietary Punch EQ technology, the 200ix allows for precise tuning of bass frequencies, providing users with the ability to create their desired sound signature. The robust build quality and thoughtful design ensure it can withstand the demands of any car audio enthusiast.

Collectively, these models showcase Rockford Fosgate’s commitment to delivering high-quality sound while incorporating innovative technologies that cater to various audio needs. Whether you’re upgrading a factory sound system or building a high-performance audio setup, the 40ix, 60ix, 100ix, and 200ix amplifiers provide the performance and reliability that Rockford Fosgate is renowned for.