9.3 Measurements of Audio Equipment

It should be recognized that measurements are not the final arbiter of sound quality of audio components. Often times a measurement standard has evolved because it is easily performed, or because it is easily repeatable, or it has shown some link to certain audible characteristics. Unquestionably, it is the latter criterion which is the most important one. After all, the listener is not concerned with how a piece of audio equipment measures, he is only concerned with the faithful recreation of the original musical event.

On the other hand, measurement techniques that correspond to audible effects are an invaluable tool to the designer. However, it is the degree of correlation with the subjective experience which is important, and anechoic bass response does not have a high correlation with musical accuracy in the listening room. In-room frequency response and transient accuracy are both significant factors in determining subjective quality. Nevertheless, anechoic frequency response is by far the most prevalent measurement used to characterize speakers.

A Correlation with Amplifier Measurements

A striking parallel exists in the measurement of audio amplifiers. The power output and distortion of an amplifier is invariably measured into an eight-ohm resistor. It is widely acknowledged that this standard is far removed from the actual conditions in which the amplifier will be used. One doesn't listen to resistors, one listens to loudspeakers, and the load that the speaker presents to the amplifier is nearly always highly reactive (varies with frequency). The eight-ohm resistive load has developed as a standard because it somewhat approximates a speaker load, is easily reproducible by different testing facilities, and it represents something of a lowest common denominator. That is, while everybody recognizes that a different load should be used for amplifier testing, nobody can agree as to what that alternative should be.2

In the last decade, there has been a growing awareness of the importance of an amplifier's capability to drive a real-world loudspeaker. This is the reason we have seen the emergence of amplifiers with high current output capabilities, and a lack of current-limiting or similar protection circuitry. The ability to drive reactive loads has been accepted as having a higher correlation with audible qualities than the traditional measurement into a load resistor.

2The cynic will also note that a resistive test load produces the most impressive measurements for use in advertisements.

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Avalon Acoustics OPUS Ceramique Loudspeaker manual Measurements of Audio Equipment, Correlation with Amplifier Measurements
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OPUS Ceramique Loudspeaker specifications

Avalon Acoustics is renowned in the high-end audio industry, and their OPUS Ceramique Loudspeaker exemplifies their dedication to exceptional sound quality and innovative design. This speaker is a perfect blend of artistry and advanced engineering, making it a coveted choice among audiophiles.

One of the key features of the OPUS Ceramique is its sophisticated driver configuration. It utilizes a three-way design, which is engineered to deliver a full spectrum of sound with impressive clarity. The loudspeaker is equipped with a 10-inch ceramic bass driver capable of deep, powerful low frequencies, ensuring that every note resonates with depth. Complementing this are dual midrange drivers made from advanced ceramic materials, which provide rich and warm mid tones. Finally, for the highs, the OPUS employs a unique ribbon tweeter designed for exceptional detail and an extended frequency response, offering a natural and airy sound that brings music to life.

The cabinet design of the OPUS Ceramique is as remarkable as its internal components. It features a rigid construction that minimizes resonance and cabinet coloration, ensuring that the sound remains pure and true to the source. The elegant curves of the speaker not only enhance its aesthetic appeal but also contribute to better acoustic performance by optimizing the dispersion of sound waves.

Another prominent technology incorporated in the OPUS Ceramique is its advanced crossover network. The crossover is meticulously engineered to ensure a seamless transition between the drivers, allowing for coherent sound reproduction across all frequencies. This means that listeners can enjoy an immersive soundstage where instruments and vocals are clearly delineated, creating a more engaging listening experience.

In addition to its acoustic prowess, the OPUS Ceramique is designed with the audiophile in mind. It is highly customizable, with various finishes available to suit any decor. The attention to detail extends to every aspect of its construction, providing both aesthetic beauty and functional performance.

Overall, the Avalon Acoustics OPUS Ceramique Loudspeaker stands as a testament to the brand's commitment to delivering extraordinary sound and elegance. With its innovative technologies and exceptional build quality, it continues to be a sought-after choice for discerning music lovers seeking the ultimate audio experience. Whether used in a dedicated listening room or as part of a high-end home theater system, the OPUS Ceramique promises to elevate any audio experience to new heights.
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