Avalon Acoustics Sentinel manual Early Reflections, Speaker Placement

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Early Reflections

When arranging the furnishings in your listening room, remember that reflective objects should not be within a five foot radius of either the speaker or listener to avoid early reflections. This suggests the possibility of a dual-purpose room, with one end devoted to music reproduction, and the other end for another use, such as a study or office. In this way, the area behind the listener will contain items that will reduce problems with standing waves and/or flutter echo, while the zone around the speakers remains relatively free from reflective objects.

If you wish to achieve an even more spacious sound-stage, it may be useful to place a sonically absorbent material on the side and rear walls near the speakers. This can be particularly effective at the points where the sound wave is directly reflected to the listening position (a mirror can be used to determine these points, as illustrated in Fig. 9.2). As the distance to the wall becomes smaller, the suppression of these reflections becomes more important.

In order to enhance the sound stage depth (and hence the feeling of musical involvement), it is important to have a greater distance from the speakers to the rear wall than to the sides walls. This is generally easier to achieve if the speakers are placed along the short wall of the listening room.

Speaker Placement

Although the Sentinel Active Reference System may be placed in a variety of positions relative to the walls of the room, it is still wise to apply the basic guidelines described in this chapter to achieve optimal results. Plan on placing the speakers along the short wall of the listening room. Then apply the 4 : 10 : 4 ratio to establish the side wall distance (see page 51). The rear wall distance should be greater than and not overly similar to the side wall distance.

The suggested minimum distances for the Sentinel are 4 feet from the side wall, and 8 feet from the rear wall (all distances are measured to the center of the 9" woofer cone). This will provide the proper degree of bass reinforcement, as well as minimize early reflections. There is no suggested upper limit for the distances to the walls. Even a distance of 10 feet to one wall and 15 feet to the other wall will provide suitable bass reinforcement, and problems due to early reflections will be non-existent. However, regardless of the absolute numbers used, the most even bass response will be attained when the distances to the side wall and the rear wall are different by at least 33%.

The exemplary horizontal polar response of the Sentinel Active Reference System makes large amounts of toe-in unnecessary. The optimum toe-in position is between two and three degrees. In situations where strong reflections from the side walls are a problem, pointing the speakers inward up to a maximum of five degrees can be helpful.

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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 PointsCabinet Care of Your Avalon LoudspeakersCrossover Cabinet DriversEvent 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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