Snell Acoustics 730770830870 User Manual
Owner’s Manual
AMC
730
770
830
870
SPECIFICATIONS
AMC730
AMC770
Frequency Response (±3dB)
Recommended Amplifier
Nominal Impedance
Sensitivity (2.83v at 1m)
Tweeter
78 Hz–20 kHz
50–125W
8 ohms
87dB SPL
1” SEAS silk dome, ferrofluid
cooling
Bass Driver
51/4-inch (132mm) treated
paper cone with butyl rubber
surround, 5mm excursion
Crossover Point
Composite Baffle
Grille
Dimensions
(HxWxD)
Rough Opening Cutout
(HxW)
Finish*
2.5 khz
Specialty adhesive between two
1
/4” layers of HD fiberboard
Perforated metal, 53% open
14 x 91/2 x 33/4 inches
(356 x 241 x 95mm)
127/8 x 83/8 inches
(327 x 212mm)
White trim, suitable for painting
66 Hz–20 kHz
50–150W
8 ohms
87dB SPL
1” SEAS silk dome, ferrofluid
cooling
61/2-inch (165mm) copolymer
with butyl rubber surround
5mm excursion
2.5 khz
Specialty adhesive between
two 1/4” layers of HD fiberboard
Perforated metal, 53% open
17 x 101/2 x 33/4 inches
(432 x 267 x 95mm)
157/8 x 93/8 inches
(403 x 238mm)
White trim, suitable for painting
Weight
* Custom paint and grilles are available for an extra charge
2
6 lbs (2.7kg) / each
AMC730
9 lbs (4kg) / each
AMC770
AMC830
AMC870
70 Hz-20 kHz
50–250W
4 ohms
89dB SPL
1” SEAS silk dome, ferrofluid
cooling
2 - 51/4-inch (132mm) treated
paper cone with butyl rubber
surround, 5mm excursion
2kHz
Specialty adhesive between two
1
/4” layers of HD fiberboard
Perforated metal, 53% open
231/4 x 131/4 x 33/4 inches
(590 x 336 x 95mm)
22 x 12 inches
(559 x 305mm)
White trim, suitable for painting
62 Hz-20 kHz
50–250W
4 ohms
90dB SPL
1” SEAS silk dome, ferrofluid
cooling
2- 61/2-inch (165mm) copolymer
with butyl rubber surround,
5mm excursion
2kHz
Specialty adhesive between two
1
/4” layers of HD fiberboard
Perforated metal, 53% open
301/2 x 101/2 x 33/4 inches
(775 x 267 x 95mm)
293/8 x 93/8 inches
(746 x 238mm)
White trim, suitable for painting
19 lbs (8.6kg) / each
AMC830
19 lbs (8.6kg) / each
AMC870
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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 unpredictable. 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 coherent 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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