Avalon Acoustics Sentinel manual Measurements of Audio Equipment

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12.2 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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Contents Musical Masterpieces Page Table of Contents Introduction Listening Position Overview IntroductionLow Noise Floor Coherent Energy Transfer Active Reference System Introduction ContentsUnpacking Instructions Room Preparation and Verification Room set-up for unpacking Crate and Box Placement for UnpackingTo unpack the crossover cabinets Opening the CratesTo unpack the upper speaker cabinets Opening the Sub Amplifier Crates Removing Apex‘ Couplers from Set-up Blocks System Set-upPreparation Left / Right Channel Matching Lower Speaker Cabinet Set-up Installation of Apex‘ couplersUpper Speaker Cabinet Set-up Page Page Crossover Cabinet Set-up Proper placement of crossover cabinet behind speakerOrientation of the upper Felt Mask Felt Anti-Diffraction MaskSub Amplifier Set-up Do not over-tighten the screws Wiring InstructionsInductive field effects Wiring and Field InteractionsDo not over-tighten the binding posts Connecting Upper Speaker Cabinet to CrossoverConnecting Speaker Cable to the Crossover Connect Speaker Cable to your Amplifier Connecting Subwoofer to the Sub Amplifier Two outputs at the preamplifier Connecting Preamplifier to the AmplifiersInterconnect Y-cable at the preamplifier Break-in Period Room Compensation Subwoofer AmplifierDesign Principle Master Felt Anti-diffraction Masks Maximizing PerformanceSeparate Left / Right Amplifiers Apex‘ Couplers Room Treatment and System / Listener PositionToe-In Corner Treatment First Reflection PointsDrivers Care of Your Avalon LoudspeakersCabinet Crossover CabinetEvent of a Problem WarrantyWarranty Statement Page Room Acoustics / Speaker Position Basic Room Acoustics An Optical AnalogyStanding Waves Flutter Echo Early Reflections Avoiding Early Reflections Angle Angle Y Reflected Sound Direct Sound Low Frequency Reflections Bass reinforcement 100 200 500 Page Flutter Echo and Standing Waves Summary of RecommendationsEarly Reflections Speaker PlacementListening Room Example Time Alignment Listening PositionPath Length Symmetry Summary Accuracy of Bass Reproduction Fast Bass Sensitivity to Time-Related InformationCorrelation with Amplifier Measurements Measurements of Audio EquipmentLoudspeaker Measurements Designing for Accurate Bass Reproduction Listening for Size Distortions Listening QualitiesFrequency Response Effects Transient Response Effects Active Control of Bass Energy Active Subwoofer SystemAnechoic Frequency Response vs. In-Room Frequency Response Features Subwoofer Amplifier SpecificationsLoudspeaker

Sentinel specifications

Avalon Acoustics Sentinel represents a pinnacle in high-fidelity loudspeakers, designed for audiophiles who demand exceptional sound quality and elegant design. Known for their commitment to meticulous craftsmanship and innovative technology, Avalon Acoustics continues to push the boundaries of acoustic performance with the Sentinel model.

One of the standout features of the Sentinel is its unique three-way design. This configuration allows for precise sound reproduction across the entire audio spectrum, delivering rich bass, articulate midrange, and sparkling highs. The speaker utilizes proprietary drivers that have been engineered to minimize distortion while maximizing dynamic range and sensitivity. This ensures that every note is rendered with clarity and precision, making it ideal for any listening environment.

The cabinet design of the Sentinel is another aspect that underscores Avalon's commitment to excellence. Constructed from carefully selected hardwoods and finished to perfection, the enclosure not only enhances aesthetic appeal but also plays a critical role in acoustic performance. Its solid build effectively reduces resonance and undesirable vibrations, allowing the drivers to perform at their best.

In terms of technology, the Sentinel incorporates advanced crossover networks. These networks are designed to ensure seamless transition between drivers, providing a cohesive soundstage. By using high-quality components, the crossover systems significantly improve the overall performance, ensuring that listeners enjoy a balanced and natural tonal quality.

Moreover, the Sentinel features adjustable bass ports, allowing users to tailor the speaker's performance to fit their specific room acoustics. This flexibility helps to optimize the listening experience, regardless of the environment. The speakers also include easy-to-use bi-wiring and bi-amping capabilities, enabling audiophiles to customize their setup for optimal sound quality.

Finally, the visual appeal of Avalon Acoustics Sentinel cannot be understated. With its sleek lines and contemporary design, it is a statement piece that complements any décor. Available in various finishes, the Sentinel seamlessly blends performance with style, catering to both auditory and aesthetic sensibilities.

In summary, Avalon Acoustics Sentinel stands out as an exceptional loudspeaker that combines advanced technology, exquisite craftsmanship, and customizable features. Its three-way design, high-quality drivers, and adjustable features make it a top contender for those seeking unparalleled sound quality in a luxurious package.
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