Avalon Acoustics Sentinel manual Low Frequency Reflections

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Low Frequency Reflections

The first significant reflection of low frequency sound waves comes from two corners behind the loudspeakers. Another important reflection occurs on the wall behind the speakers, midway between them. Similarly, low frequency corner and wall reflections take place at the opposite wall, behind the listener. These reflections can cause significant distortions in phase and amplitude, resulting in muddy bass definition, smeared bass transients, and compressed image definition.

Placing Tube-Traps (available from Acoustic Sciences Corporation) at selected locations and orientations in the listening room can significantly control these bass colorations and restore the quickness of bass transients and the depth of sound stage. We recommend placing floor-to-ceiling columns of Tube-Traps at all four room corners, at the wall behind the speakers centered between them, and centered at the wall behind the listener. For listening rooms with low ceiling height, consider treating the wall-ceiling junctions with tube traps as well.

Radial orientation of tube traps is critical. The traps at the wall directly behind the listener, at the wall centered behind the speakers, and at the two corners behind the listener should be placed with their absorptive sides (the side with the seam) facing into the room, parallel with the side walls. The traps at the two corners behind the speakers can be tuned to the listening room, using the following rough guidelines (see Figure 9.3):

•seam toward center of room, parallel with back wall: adds depth to sound stage

•seam away from center of room, parallel with back wall: adds width to sound stage

•seam pointing into corner: sounds livelier, best tonal balance

Seam facing

 

 

 

 

 

 

 

Seam facing

into corner

 

 

 

 

 

 

 

into room

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Seam facing into room

Seam facing into room

Seam facing

Seam facing

into corner

into room

Figure 9.3 – Tube trap placement and orientation. In this example, the tube traps are oriented for best overall tonal balance.

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Contents Musical Masterpieces Page Table of Contents Introduction Listening Position Introduction OverviewLow Noise Floor Coherent Energy Transfer Active Reference System Contents Unpacking InstructionsIntroduction Room Preparation and Verification Crate and Box Placement for Unpacking Room set-up for unpackingOpening the Crates To unpack the crossover cabinetsTo unpack the upper speaker cabinets Opening the Sub Amplifier Crates System Set-up PreparationRemoving Apex‘ Couplers from Set-up Blocks Left / Right Channel Matching Installation of Apex‘ couplers Lower Speaker Cabinet Set-upUpper Speaker Cabinet Set-up Page Page Proper placement of crossover cabinet behind speaker Crossover Cabinet Set-upFelt Anti-Diffraction Mask Orientation of the upper Felt MaskSub Amplifier Set-up Wiring Instructions Do not over-tighten the screwsWiring and Field Interactions Inductive field effectsConnecting Upper Speaker Cabinet to Crossover Do not over-tighten the binding postsConnecting Speaker Cable to the Crossover Connect Speaker Cable to your Amplifier Connecting Subwoofer to the Sub Amplifier Connecting Preamplifier to the Amplifiers Interconnect Y-cable at the preamplifierTwo outputs at the preamplifier Break-in Period Subwoofer Amplifier Design PrincipleRoom Compensation Master Maximizing Performance Separate Left / Right AmplifiersFelt Anti-diffraction Masks Room Treatment and System / Listener Position Toe-InApex‘ Couplers First Reflection Points Corner TreatmentCare of Your Avalon Loudspeakers CabinetCrossover Cabinet DriversWarranty Event of a ProblemWarranty Statement Page Room Acoustics / Speaker Position An Optical Analogy Basic Room AcousticsStanding Waves Flutter Echo Early Reflections Avoiding Early Reflections Angle Angle Y Reflected Sound Direct Sound Low Frequency Reflections Bass reinforcement 100 200 500 Page Summary of Recommendations Flutter Echo and Standing WavesSpeaker Placement Early ReflectionsListening Room Example Listening Position Path Length SymmetryTime Alignment Summary Accuracy of Bass Reproduction Sensitivity to Time-Related Information Fast BassMeasurements of Audio Equipment Correlation with Amplifier MeasurementsLoudspeaker Measurements Designing for Accurate Bass Reproduction Listening Qualities Frequency Response EffectsListening for Size Distortions Transient Response Effects Active Subwoofer System Anechoic Frequency Response vs. In-Room Frequency ResponseActive Control of Bass Energy Features Specifications LoudspeakerSubwoofer Amplifier

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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