Avalon Acoustics AVALON INDRA Manuel utilisateur
SERIAL NUMBERS:________________
HANDCRAFTED BY:
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INDRA
R
DESIGNED BY NEIL PATEL FOR AVALON ACOUSTICS
This product is certified to meet the requirements of the European Union (EU)
Electromagnetic Compatibility (EMC) Directive (89/336/EEC). Because the permanent
magnets attached to the loudspeaker drivers produce magnetic fields, it is
recommended that the product not be positioned in very close proximity to computer
monitors or television sets.
Table of Contents
1 Introduction ............................................................................................................................4
2 Unpacking Instructions..........................................................................................................5
Introduction...........................................................................................................5
Contents ................................................................................................................5
2.1 Opening the Crate ....................................................................................................6
2.2 Installing the Grilles.....................................................................................................7
Orientation of the Felt Anti-Diffraction Mask ..................................................7
2.3 Replacing Grille Pins ...................................................................................................7
3 Wiring Instructions ..................................................................................................................10
Introduction...........................................................................................................10
Connecting the Speaker to the Amplifier .......................................................10
4 Break-in Period.......................................................................................................................11
5 Maximizing Performance......................................................................................................12
Break-in ..................................................................................................................12
Grille Assemblies ...................................................................................................12
Speaker Placement and Symmetry .................................................................12
Toe-In......................................................................................................................13
Apex™ Couplers ..................................................................................................13
First Reflection Points ...........................................................................................14
Corner Treatment.................................................................................................14
6 Care of Your Loudspeakers ..................................................................................................15
Cabinet (Hardwood Finish) ................................................................................15
Grille Assembly......................................................................................................15
Drivers .....................................................................................................................15
7 Warranty..................................................................................................................................16
In the Event of a Problem ...................................................................................16
Warranty Statement ............................................................................................17
8 Room Acoustics and Speaker Position ...............................................................................19
Introduction...........................................................................................................19
An Optical Analogy.............................................................................................20
Basic Room Acoustics .........................................................................................20
8.1 Standing Waves..........................................................................................................21
8.2 Flutter Echo ..................................................................................................................22
8.3 Early Reflections..........................................................................................................23
Avoiding Early Reflections ..................................................................................24
8.4 Bass reinforcement.....................................................................................................26
8.5 Summary of Recommendations .............................................................................30
Flutter Echo and Standing Waves ....................................................................30
Speaker Placement.............................................................................................31
Early Reflections ...................................................................................................31
8.6 A Listening Room Example .......................................................................................32
9 Accuracy of Bass Reproduction.......................................................................................... 33
Introduction .......................................................................................................... 33
9.1 Sensitivity to Time-Related Information.................................................................. 34
"Fast Bass" .............................................................................................................. 34
9.2 Rationale ..................................................................................................................... 35
Anechoic vs. In-Room Frequency Response ................................................. 35
9.3 Measurements of Audio Equipment ...................................................................... 36
A Correlation with Amplifier Measurements................................................... 36
Loudspeaker Measurements............................................................................. 37
Designing for Accurate Bass Reproduction ................................................... 38
Frequency Response Effects ............................................................................. 39
Listening for Size Distortions ................................................................................ 39
Transient Response Effects ................................................................................. 40
9.4 Conclusion .................................................................................................................. 41
10 Features ................................................................................................................................ 42
11 Specifications ...................................................................................................................... 43
12 Notes..................................................................................................................................... 44
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1 Introduction
Congratulations on your purchase of AVALON INDRA, one of the most
technologically advanced high-energy transducers ever created.
INDRA represents the culmination of 20 years of research and development in
the areas of transient response, bandwidth, noise floor and octave-to-octave
energy balance. The result sets a new standard for realistic reproduction of
the complete musical event. More than just transparent and dynamic, INDRA
has the groundbreaking ability to recreate a holographic sound-field
completely free of the loudspeaker cabinet and room boundaries. INDRA will
reveal the most subtle nuance and detail of the musical performance in
three-dimensional space.
Utilizing proprietary crossover technologies and drivers consisting of the
lightest and most inert diaphragm materials of Nomex/Kevlar and ceramic,
INDRA can instantly respond to the most demanding musical passages.
Revolutionary crossover damping networks virtually eliminate driver overhang
and energy storage. Multiple layering and material usage in our legendary
cabinet construction eliminates cabinet resonance allowing for a continuous
musical flow like no other loudspeaker.
All AVALON ACOUSTICS loudspeakers are designed and built to the highest
standards in the audio industry. Hand assembled by dedicated craftsmen
and technicians, each loudspeaker is measured and matched creating
perfect symmetry and coherency. Before leaving the factory each of our
masterpieces are subjected to a demanding array of quality control and
testing procedures to assure flawless and consistent performance.
www.avalonacoustics.com
5
2 Unpacking Instructions
Introduction
Your AVALON ACOUSTICS loudspeakers were shipped in a heavy-duty crate to
ensure their safe arrival. It is recommended to save these crates for possible
future use. Due to the weight of the speakers, it will require two persons to
un-crate them and position them for listening. Please arrange for your dealer
or another able bodied person to assist in this project.
Contents
The shipping crate contain the following items:
two loudspeaker cabinets
two grille assemblies
the owner’s manual
one set of six Apex™ Couplers
an accessory bag
The grille assemblies and owner’s manual are contained in an outer
compartment on the top of the shipping crate. The Apex™ Couplers and
accessory bag are packed together on the bottom of one of the
loudspeaker cabinets.
The accessory bag contains replacement grille pins, a small bottle of furniture
polish, and two lint-free polishing cloths.
IMPORTANT: It is imperative that the Apex™ Couplers are utilized, in order to
insure that the bottoms of the loudspeakers are not blocked. This is especially
important on thick carpeting.
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2.1 Opening the Crate
The crate features a one-piece top assembly which is fastened to the crate
bottom with screws around the lower perimeter. To unpack, remove the
screws and lift the upper portion of the crate straight up (this will require two
people).
Next, slide each speaker part way off of the crate base so that the plastic
bag can be unfastened from the enclosure bottom. Stand the speaker up
and the bag can be slid off the top. Please refer to Figure 2.1.
Figure 2.1 - To unpack the loudspeakers.
1. Remove screws.
2. Lift case.
3. Slide speaker,
then undo bag.
4. Stand speaker up,
then remove bag.
7
2.2 Installing the Grilles
The grille assemblies are behind a panel on the outside of the speaker crate.
Remove the screws securing the panel, and then carefully pull the grilles
straight out. The grilles are installed with friction fasteners and press into place
on the speaker cabinets. Please see Figure 2.2.
Orientation of the Felt Anti-Diffraction Mask
The grille assembly includes a felt anti-diffraction mask. Should the felt mask
be removed, be sure to note the correct inside-outside orientation when
re-installing it. The tweeter and midrange openings are beveled on the side
that faces the listener (away from the speaker).
Figure 2.2 - To install the grille assemblies.
8
2.3 Replacing Grille Pins
The grille pins installed on the grille assemblies are fragile and can be easily
damaged. Should any of the pins break, you may replace them using the
following procedure.
1. Place the grille assembly face-down on a padded surface (a towel or
carpeting).
2. Remove the damaged grille pin by pulling it straight out with a small pliers
or similar tool. Please refer to figure 2.4. Make sure that the complete pin is
removed and that there are no pin fragments left in the mounting hole.
3. Insert the new grille pin in the grille pin installation tool (see figure 2.5).
Figure 2.4 - Removal of broken grille pin. Check for pin fragments in
the mounting hole.
Figure 2.5 - Insertion of new grille pin into installation tool.
9
4. Carefully pull the grille cloth away from the frame mounting hole. The
mounting hole must be clear of all obstacles during pin installation.
5. Place the exposed end of the grille pin in the open mounting hole. Check
to insure that the grille cloth is not trapped between the pin and frame. Use a
small hammer and gently tap the new grille pin in place. Then, pull the
insertion tool off the new pin and verify that the pin flange is flush with the
surface of the grille. Please refer to Figure 2.6.
WARNING: Grille pin breakage may result if the grille cloth becomes trapped
between the pin and frame during installation.
6. Reposition the grille cloth that was pulled away from the frame mounting
hole in step 4. The cloth should lay flat and wrinkle-free.
Figure 2.6 - Installing grille pin into INDRA grille frame. Note that after
installation, the grille pin flange is flush with the surface of the grille.
10
3 Wiring Instructions
Introduction
The crossover is housed in a sealed, non-accessible chamber in the bottom of
the speaker cabinet, to minimize the effect of vibration on the components.
The INDRA is equipped with high-quality binding post for connecting the
speaker cables. Spade lugs are recommended for all cable terminations.
Connecting the Speaker to the Amplifier
1. Place the speaker in its approximate location, then lay the speaker on its
side, using a soft surface to avoid scratching the finish.
2. Connect the speaker wires to the terminal block on the speaker bottom
(see Figure 3.1). Check to insure the correct polarity (positive lead connected
to the (+) terminal and negative lead connected to the (-) terminal.
Do NOT over-tighten the screws.
Figure 3.1 –Back view of the speakers showing the connections from the
amplifier to the loudspeaker. Check to insure the correct polarity (positive lead
connected to the (+) terminal and negative lead connected to the (-) terminal).
Ce manuel convient aux modèles suivants
1
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