Avalon Acoustics Isis Manual de usuario
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.
SERIAL NUMBERS:_________________
HANDCRAFTED BY:
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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 Important ISIS Recommendations .......................................................................... 41
10 Features ................................................................................................................................ 41
11 Specifications ...................................................................................................................... 43
12 Notes..................................................................................................................................... 44
4
1 Introduction
is the most technologically advanced high-energy transducer ever
created. Our focused research over a period of four years has produced a
range of advancements in each aspect of loudspeaker performance.
Proprietary conductors and magnetic technologies, as well as new
techniques in cabinet construction, have been combined with the first
implementation of full range neodymium driver motors, for the expressed
purpose of empirical improvements in all aspects of energy transfer. In each
facet of transducer refinement the Isis sets a new benchmark for lack of
obscuring distortions of all types. The noise floor is lower, the transient
response faster, the storage of stray energy less than ever before. Most
importantly, the octave to octave energy balance is equivalent throughout
the extended bandwidth envelope, developed without compression of any
kind and yet critically damped, thus delivering a dynamic and spatial
presentation that is absolutely faithful to the recording. The result is a large
dynamic system that behaves like a small monitor, revealing the most subtle
details of space and time combined with the ability to create explosive sound
pressure contrasts. By creating and combining our own proprietary
technologies, we have produced a rare and exclusive transducer that will set
the empirical and musical standard of reference for many years to come.
5
2 Unpacking Instructions
Introduction
Your AVALON ACOUSTICS loudspeakers were shipped in a two heavy-duty crates
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 two shipping crate contains the following items:
two loudspeaker cabinets
two grille assemblies, total of four (4) grilles
the owner’s manual
one set of six Apex™ Couplers
an accessory bag
Each shipping crate contains one loudspeaker unit. The grille assemblies and
owner’s manual are contained in an outer compartment on the top of the
shipping crates. 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.
6
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. Please note that the
binding post is on the back of the speaker. Be sure to slide speaker to end
and not the side. Stand the speaker up and the bag can be pulled 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 ISIS 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 encapsulated in a sealed, non-accessible chamber in the
bottom of the speaker cabinet, to minimize the effect of vibration on the
components. The ISIS is equipped with high-quality binding posts for
connecting the speaker cables. Spade lugs are recommended for 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 binding posts on the speaker back (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).
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