Owner’s Manual
AMC
730
770
830
870
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AMC830
70 Hz-20 kHz
50–250W
4 ohms
AMC870
62 Hz-20 kHz
50–250W
4 ohms
89dB SPL
90dB SPL
1” SEAS silk dome, ferrofluid
cooling
1” SEAS silk dome, ferrofluid
cooling
2 - 51/4-inch (132mm) treated
paper cone with butyl rubber
surround, 5mm excursion
2- 61/2-inch (165mm) copolymer
with butyl rubber surround,
5mm excursion
2kHz
2kHz
Specialty adhesive between two
1/4” layers of HD fiberboard
Specialty adhesive between two
1/4” layers of HD fiberboard
Perforated metal, 53% open
Perforated metal, 53% open
231/4 x 131/4 x 33/4 inches
(590 x 336 x 95mm)
301/2 x 101/2 x 33/4 inches
(775 x 267 x 95mm)
22 x 12 inches
(559 x 305mm)
293/8 x 93/8 inches
(746 x 238mm)
White trim, suitable for painting
19 lbs (8.6kg) / each
White trim, suitable for painting
19 lbs (8.6kg) / each
AMC830
AMC870
3
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INTRODUCTION: WHAT IS A HIGH END IN-WALL?
The new Snell AMC series units bring a novel approach to the design and construction of
in-wall loudspeakers, expanding the boundaries of in-wall performance.
Our primary goal was to develop loudspeakers that delivered performance that was as close as
possible to that of our highly regarded freestanding loudspeakers, like the K7 and LCR7. To do
this several issues had to be addressed.
The bass performance of conventional loudspeakers mounted in wall cavities is very unpredict-
able. Cavity volume can be large, which should be good for bass performance. However, with
one very short dimension (approximately 4”) and one very long dimension (up to 8’), the wall
cavity takes on the characteristics of a closed-end organ pipe. This creates a strong resonance
that tends to null out the bass. Lining this cavity with fiberglass will reduce the “Q” of the
notch but not restore the bass. What is needed is a defined volume of a more regular size. This
is best done with fully enclosed in-wall speakers.
The Snell AMC loudspeaker enclosure is a thin, but strong, aluminum tub. It is both damped
and braced. This largely contains the back radiated sound of the woofer within the enclosure.
An added benefit of containing the woofer output is a reduced chance that resonances will be
excited in the house walls. Furthermore, sound “bleed through” to adjacent rooms is reduced.
To minimize resonances in the Snell enclosure, the speaker baffle uses a technique first
pioneered on our .5 and XA series loudspeakers. The baffle is a three part composite with MDF
(fiberboard) outer layers around a thin, but highly effective, damping layer. This controls the
panel resonances of the baffle that can obscure midrange clarity. As we have found with our
freestanding loudspeakers, a better loudspeaker cabinet means a better sounding loudspeaker.
In addition to these unique solutions, all traditional Snell attributes are retained. Highly coher-
ent in-phase crossover networks ensure a seamless blend from driver to driver. Drivers are
designed for smooth, wide range response and low distortion. Long sessions of listening and
adjusting give each system that special, characteristic Snell sound. Finally, that Snell sound is
guaranteed in every production pair by Snell’s proprietary 0.5dB production tuning techniques.
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PLACEMENT OF THE FRONT CHANNEL SPEAKERS
A home theatre system includes three loudspeakers placed across the front of the listening
room. The distance between the left and right speakers determines the width of the stereo
image. If the speakers are placed too close together, the image will be too narrow; too far apart
and the blend will suffer, creating a hole in the middle. When properly placed, your speakers
will create a continuous “virtual image” from left to right, with an illusion of sound outside, in
front of, and behind the speaker systems.
We recommend an angular separation
between 45 degrees and 60 degrees
(when viewed from above). This is
equivalent to a separation between the
speaker systems that is about 85% of the
distance to either of the speakers.
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Creation of sounds between the speakers
requires some precise placement. The
distance from the left speaker, right
speaker, and center channel to the
listener location should all be as equal as
possible. We advise using a tape measure
to equalize these two distances to the
primary listening location.
Ideally the front channel speakers should
be installed at the same height as the
ears of a seated listener. Try to keep the
front channel tweeters within two vertical feet of that height.
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PLACEMENT OF THE SURROUND SPEAKERS
There are many opinions about where surround or “rear” speakers should be mounted. The
following is based on the findings of the best academics, and on our experience with many
installations. These placement recommendations apply to all the AMC models.
If two surrounds are used in a standard
5.1 configuration (not 7.1 or EX), they
are best mounted to the sides of the lis-
tening area. This means straight to the
sides of the listener or in line with the
primary row of seating, plus or minus
15 degrees. This is preferred over back
wall mounting for several reasons: It
places the surrounds at locations where
the difference between left ear and
right ear discrimination is at a maxi-
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mum. This gives the maximum sense of
“envelopment” or being surrounded by
sound. Rear mounted speakers force a
huge angular gulf between the front primary speakers and the rear speakers. The sound image
is inherently discontinuous. Also, front to rear aural discrimination is not very strong. Differen-
tiation between front and rear speakers will not be as strong as the effect of adding speakers
to the side. 7.1 or EX systems that use side and rear speakers together overcome all of these
obstacles and give both maximum envelopment and a more continuous surround effect.
A second factor to consider is the evenness of sound coverage over the seating area. Most
surround processors have features for setting the balance of all channels. A circulating noise
signal is adjusted in each channel until the apparent or measured sound level is even. Of course,
moving to another seat will shift this balance somewhat. Well-placed surround speakers will
minimize the level variation from seat to seat. The best way to achieve evenness is to increase
the distance of the surround speakers from the listening area. Mount them high on the side
walls or even on the ceiling. As a good rule of thumb, surrounds should be on the side walls at
least one foot above the height of a standing listener. If the speakers are ceiling-mounted, they
should be close to the side walls, well away from an overhead position.
If a large theater room with three or more rows of seats is planned,then more than one pair of
surround speakers should be used to give more even coverage and a more diffuse sound field.
We recommend that a pair of surrounds be used for every other seating row (the first, the third,
the fifth, etc.). This follows standard cinema practice.
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INSTALLATION INSTRUCTIONS
IMPORTANT: This manual assumes that the installer possesses skill in the proper use of
hand and power tools, knowledge of local building and fire codes, and a familiarity
with the environment behind the wall or ceiling in which the speakers will be installed.
Optional preconstruction brackets are available for each model.
PAINTING THE SPEAKERS
If you intend to paint the speakers, it is best to do so before installation.
1) Remove the speaker grille.
2) Mask the baffle.
3) After painting, carefully remove the paint mask.
Note: Custom paint and grilles are available for an extra charge.
PREPARING FOR INSTALLATION
Map out the wiring paths from the speakers to the amplifier. We recommend 16-gauge wire for
runs up to 25 feet, and 14-gauge wire for longer runs. Be sure the speaker wire does not rest or
rub against any sharp or pointed objects.
The speakers should be mounted on a flat surface to form a good seal between the speaker
flange and the mounting surface.
When connecting more than two speakers per amplifier channel, you should use series/parallel
wiring. In all cases, make certain that the total impedance does not fall below the amplifier’s
rating. If you are not sure, contact your Snell Acoustics dealer.
You will Need:
1) A utility knife, an electric jigsaw, or other means of cutting a hole in the mounting surface.
2) A #2 Phillips screwdriver.
3) A wire cutter or stripper for preparing the speaker wires.
With the supplied hardware, the speaker can be installed in existing walls or ceilings from 1/2”
1
(12mm) to 1 /2” (38mm). For thinner walls, you will need to use spacers for the mounting legs
(contact your Snell dealer for this optional rubber part).
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INSTALLATION
For convenient installation, these Snell AMC series speaker systems use a dog-leg mounting sys-
tem (see illustrations below). This provides a quick and clean install. Furthermore, the dog-legs
can be removed if a particular situation requires the speaker to be directly attached to a stud.
1) Make an appropriate size speaker mounting cutout in the wall material.
2) Run the wire from the amplifier to the cutout. Allow an extra foot of wire at the cutout.
Strip 1/2” (12mm) off the wire, and tightly twist the wire strands together.
3) Remove the speaker grille.
4) Insert the speaker wires into the spring
terminal binding posts.
Important: Typically, one side of the wire is
smooth. Connect this side to the – (black)
speaker terminal. The other side has a rib or
stripe. Connect this to the + (red) speaker
terminal. Connect wire at the amplifier in
the same way. Failure to do so will result in
degraded sound.
Warning! To prevent electrical shock, always
switch off the amplifier or receiver when
making connections to the speaker system.
5) Place the speaker into the rough opening.
6) Level the speaker and tighten the screws, being careful not to over tighten them. See dia-
gram below for details.
7) Replace the speaker grille.
Turn the mounting clamps against the enclosure, then place the
speaker in the mounting hole. Use a phillips head screwdriver to deploy
the mounting clamps and pull them against the back of the drywall.
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LISTENING LEVELS AND POWER HANDLING
The power recommendation for the system assumes you will operate the amplifier in a way
that will not produce distortion. All speakers can be damaged by even a modest amplifier if it is
producing distortion. If you hear a gritty noise or other signs of strain, turn down the volume.
Prolonged or repeated operation of your speakers with a distorted signal can cause damage
that is not covered by the warranty. It is especially important that you do not overdrive the
bass capability of smaller speakers. Watch for noises, such as pops, caused by the music’s bass
line. Use of the loudness control and/or full bass boost at louder volumes is likely to overdrive
the woofer. Use such controls sparingly.
HOW TO CARE FOR YOUR SPEAKERS
Use a soft terry cloth towel slightly dampened with water, glass cleaner, or a diluted mild
detergent. The towel should be just damp enough to wipe the surface clean without leaving
a trail of moisture.
/
Do not use abrasive cleaners or any cleaner containing chemicals harsher than those found
in glass cleaner.
/
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LIMITED WARRANTY
For five years from the date of purchase, Snell Acoustics will repair for the original owner any
defect in materials or workmanship that occurs in normal use of the speaker system, without
charge for parts and labor.
Your responsibilities are to use the product according to the instructions supplied, to provide
safe and secure transportation to an authorized Snell Acoustics service representative, and to
present proof of purchase from an authorized Snell dealer in the form of your sales slip when
requesting service.
Excluded from this warranty is damage that results from abuse, misuse, accidents, shipping,
repairs, or modifications by anyone other than an authorized Snell Acoustics service representa-
tive. This warranty is void if the serial number has been removed or defaced.
This warranty gives you specific legal rights, and you may also have other rights that vary from
state to state.
If Service Seems Necessary
Contact the dealer from whom you purchased the speaker system. If that is not possible, call us
at 978-538-6262, or write to:
Snell Acoustics
300 Jubilee Drive, P.O. Box 3717
Peabody, MA 01961-3717
We will promptly advise you of what action to take. If it is necessary to return your speaker
system to the factory, please ship it prepaid in the original factory packaging. Please note that
Snell Acoustics will not be held liable for shipping damage due to improper packaging. After it
has been repaired, we will return it freight prepaid in the U.S. or Canada.
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300 Jubilee Drive, P.O. Box 3717
Peabody, MA 01961-3717
phone: 978-538-6262
fax: 978-538-6266
email: [email protected]
©2007 Snell Acoustics. All Rights Reserved.
Specifications are subject to change without notice.
Covered by patents issued and/or pending.
Part #542-1039
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