Avalon-acoustics Sentinel Manuel d'utilisateur

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102.1 Room Preparation and VerificationThe Sentinel Active Reference System weighs over 1,100 pounds (about 520kg). It is therefore crucial to

112.2 Crate and Box Placement for UnpackingBecause of the weight and size of the Sentinel Active Reference System, it isimportant to plan the layo

122.3 Opening the CratesAll of the crates features a one-piece top assembly which is fastened to thecrate bottom with screws around the lower perimet

13To unpack the upper speaker cabinets, remove the screws and lift the upperportion of the crate straight up (this will require two people). Carefull

142.3 Opening the Sub Amplifier CratesThe Subwoofer Amplifiers are also packed in heavy-duty crates. To unpack,remove the screws and lift the upper

153 System Set-upWARNING: Failure to follow the set-up and wiring instructions explicitly maycause damage to your loudspeakers and void your warran

16Left / Right Channel MatchingThe two system channels (left and right) are consecutively serialized at thefactory. The elements of each channel

173.1 Lower Speaker Cabinet Set-upCAUTION: Three people are required for the set-up procedure. To avoid injury,do NOT attempt to set-up by oneself.1

183.2 Upper Speaker Cabinet Set-upCAUTION: Three people are required for the set-up procedure. To avoid injury,do NOT attempt to set-up by oneself.1

195. Carefully lift each upper speaker cabinet by the small overhang at thebase, and place it directly on top of the lower speaker cabinet, with

20cabinet slightly, remove the front set-up block, and lower the single front Apex‘ Coupler into its receiving socket.Figure 3.5 – Removal of the set-

213.3 Crossover Cabinet Set-upCAUTION: Three people are required for the set-up procedure. To avoid injury,do NOT attempt to set-up by oneself.1.

223.4 The Felt Anti-Diffraction MaskThe anti-diffraction masks are installed at the factory, and fit within therecesses on the cabinet f

233.5 Sub Amplifier Set-upPlace the Sub Amplifiers in their final set-up positions, allowing 8 inches at therear for tightening the speaker output co

244 Wiring InstructionsWARNING: Failure to follow the set-up and wiring instructions explicitly maycause damage to your loudspeakers and void your

254.1 Wiring and Field InteractionsThe Sentinel Active Reference System is an extremely revealing, high-energydevice. Therefore, it is important to

264.2 Connecting Upper Speaker Cabinet to Crossover1. Locate the upper speaker cabinet wiring harnesses: a four-conductorwiring harness wit

274.3 Connecting Speaker Cable to the Crossover1. Locate the input terminal block on the bottom of the crossover cabinets.Route your own SINGLE-WIR

28 4.4 Connect Speaker Cable to your AmplifierAlthough it is possible to power the Sentinel Active Reference System with asingle stereo amplifier, it

294.4 Connecting Subwoofer to the Sub Amplifier1. Locate the lower speaker cabinet wiring harnesses: two single-conductorwiring cables with the lab

Table of Contents1 Introduction...5Ov

304.5 Connecting Preamplifier to the AmplifiersThe Sentinel subwoofer section is actively powered by its own subwooferamplifier, whereas

315 Break-in PeriodYour new Avalon Acoustics Sentinel Active Reference System has an initialbreak-in period. It will not perform to its full so

326 Subwoofer AmplifierDesign PrincipleThe Sentinel subwoofer amplifier provides essential support for the lowestoctaves of the musical

331. Set the Master Gain on the subwoofer amplifier (see Figure 6.1) to matchthe output level of your main amplifier. This adjustment is both equipmen

347 Maximizing PerformanceThese details are imperative to obtaining optimum results from your AvalonAcoustics loudspeakers.Break-inThe break-in

35Room Treatment and System / Listener PositionSelecting the proper room and listener positions within your listeningenvironment can dramatic

36First Reflection PointsSince the ear/brain system tends to integrate the sounds arriving within a 10millisecond time window, it is important to co

378 Care of Your Avalon LoudspeakersCabinetAvalon Acoustics’ hardwood finished loudspeakers are supplied with aspecial polish and two lint-fr

389 WarrantyYour Avalon Acoustics loudspeakers are warranted against defects inworkmanship and materials for a period of five years,!

39Warranty Statement1. Avalon Acoustics warrants the materials, workmanship, and properfunctioning of this product for a period of fiv

9 Room Acoustics and Speaker Position ...41Introduction ...

406. The above warranty is the sole warranty given by Avalon Acoustics, and isin lieu of all other warranties. All implied warranties, including

4110 Room Acoustics / Speaker PositionIntroductionThe listening room forms the final link of the playback system, as important asany other component

42An Optical AnalogyLet us use a visual analogy to aid our understanding of acoustics. Imaginethat you are in a room that is lit only b

4310.1 Standing WavesThe parallel surfaces of most listening rooms can lead to a potential problemat any frequency. A sound wave can be repeatedly r

4410.2 Flutter EchoThese parallel, reflective surfaces can also produce a different audibleproblem. If there is little absorption at higher

4510.3 Early ReflectionsAnother situation that can reduce the subjective quality of reproduced soundis the presence of early reflections. By early

46Avoiding Early ReflectionsThe speed of sound is approximately one foot (30 cm) per millisecond.Therefore, to preserve the natural so

47It is not necessary to acoustically treat the entire room to achieve goodresults. Strategic treatment of specific locations can r

48Low Frequency ReflectionsThe first significant reflection of low frequency sound waves comes from twocorners behind the loudspeakers. Another impor

4910.4 Bass reinforcementBy bass reinforcement, we mean the effect of the room boundaries on thepropagation of sound. It is widely known that speaker

51 IntroductionOverviewThe Avalon Acoustics Sentinel Active Reference System represents theapplication of edge-of-the-art loudspeaker technol

50As frequency increases and wavelength becomes more similar to thedistance to the boundary, the phase difference between original a

51There are typically three reflective surfaces near each speaker: the floor, therear wall, and the side wall. Each of these surfaces produc

5210.5 Summary of RecommendationsNow that we have looked at some of the common problems of listeningrooms, as well as their cures,

53Early ReflectionsWhen arranging the furnishings in your listening room, remember thatreflective objects should not be within a five foot ra

5410.6 A Listening Room ExampleIn order to make these points more clear, an example of a room layout isgiven in Figure 9.6, illustrating the

5511 Listening PositionJust as loudspeaker positioning and room treatment can address the issues ofstanding waves, flutter echo, reflections, an

56SummaryWhen the listener and system are situated properly within a carefully plannedand set-up listening environment, the Sentinel multi-way system

5712 Accuracy of Bass ReproductionIntroductionWe have all had the experience of listening to speakers with poor bassquality. Perhaps th

5812.1 Sensitivity to Time-Related InformationIt is widely known that the human ear/brain system is extremely sensitive totime-related distortions.

5912.2 Measurements of Audio EquipmentIt should be recognized that measurements are not the final arbiter of soundquality of audio components. Of

61.1 Low Noise FloorA key element in achieving the sonic goals mentioned in the previous sectionis significantly reducing the noise floor. The term

60Loudspeaker MeasurementsReturning to loudspeakers, a similar situation has developed. Althoughnobody listens to music in an anechoic chamber

61Designing for Accurate Bass ReproductionHow, then, does one arrive at the goal of a loudspeaker that provides tonalaccuracy in the listening room? T

6212.3 Listening QualitiesNow we will turn our attention to the listening experience, and describe howthese measurable properties correlate with our

63Transient Response EffectsA speaker with poor transient response will store energy, releasing it after theinitial musical transient has passed. This

6412.4 Active Subwoofer SystemDesigning a loudspeaker system for accurate low-frequency reproduction is achallenging proposition. Given a reasonabl

6513 Features•Application of new cabinet research features nineteen separateaperiodically damped internal chambers in three distinct sp

6614 SpecificationsLoudspeaker Driver Complement 1" concave ceramic dome tweeter3 _" concave ceramic dome midrange9" Nomex-Kevlar c

6715 Notes

71.2 Coherent Energy TransferCoherent energy is both an aspect of the absolute quantity of energy, andalso the speed with which that energy be

81.3 The Active Reference SystemA definitive transducer project of this magnitude demands the holisticintegration of diverse design goals, i

92 Unpacking InstructionsIntroductionYour Avalon Acoustics loudspeakers and sub amplifiers were shipped in sevenheavy-duty crates to ensure their