stellar labs 50-10575 User manual
In-Wall
Sub Woofer
Installation Manual
Model #50-10575
Stellar Labs
Division of MCM Electronics
650 Congress Park Drive
Centerville, Ohio 45459
www.mcmelectronics.com
© 2009 MCM a Premier Farnell Company
General Features
•Dual treated paper cone woofers, each with 30 oz. vented magnets
•Treated foam surrounds
•12dB/octave low pass filter at 200Hz
•Detachable screw terminal strips
•Eight wall mounting points (
instead of conventional six
) for added stability
Specifications
Woofer Size Dual 8"
Power Capacity 100W/200W RMS/peak
Frequency Response 45Hz ~ 200KHz
Nominal Impedance 8
(per channel)
SPL 90dB W/M
Note:
This speaker utilizes dual 8" woofers, each with 8impedance and independent crossover channels.
It may be connected directly to the output of a conventional stereo amplifier, placing an 8load on each
channel. If this is to be used with an independent subwoofer amplifier, the two channels should be placed in
parallel, thus creating a 4load. In special circumstances, where multiple subwoofers are being connected
together, it is also suitable to place the two channels in series to create a 16load.
Dimensions
(assumes vertical mount)
Front Outer Frame 20.75" (H) x 11.375" (W)
Required Cutout 19.25" (H) x 8.75" (W)
Mounting Depth 3.75"
Speaker Placement
Unlike conventional two-way and three way speakers, subwoofers are only designed to create the low
frequency bass response. Because these frequencies are not directional, the subwoofer may be placed out
of the way. From a standpoint of room gain, it is best to locate near a corner. If used in a home theater
environment, it is best to have on the same wall as the front and center channel speakers.
Note that due to the low frequency material being produced by this speaker system, and the relatively high
mass of the cone assemblies, potential for high vibration exists. Corner mounting will help reduce this to
some extent, but extra reinforcement inside the wall, including double studs may be worth consideration (in
new work installations). For added support in ceiling installation, a 3/4" thick sheet of plywood should be
installed between the ceiling joists (anchored to the joists), immediately behind the drywall, with the
speaker cutout being in the ceiling sheet and the plywood.
Speaker Wire
It is important that good quality wire is used in the installation. Installed speakers generally have much
longer wire runs than normal home theater speakers, hence heavier gauge wire is recommended. Note:
There are numerous manufactures in the market offering “high-end” esoteric speaker wire, with claims of
exotic materials and superior performance. Truthfully, this type of product has been found to provide little
or no benefit to installations of this type. Good quality 16AWG CL2 rated in-wall wire, such as MCM #24-
9995 (two-conductor), #24-10015 (four-conductor) or similar, provide outstanding performance in this
application.
When running this cable, a few simple guidelines must be followed
•Speaker wire should be kept away from AC wiring to prevent noise. If AC wiring and speaker wire
must cross paths, it is best to have them cross at a 90º angle, minimizing the common surface
area between the two
•Speaker wire and AC lines should NEVER pass through the same hole in studs or joists
•When connecting to a dedicated subwoofer amplifier, the speaker wire should be run from this
speaker, directly to the amplifier
•When using with a small pair of in-wall or ceiling speakers, with a stereo amplifier, it is suitable to
run speaker wire from the amplifier, to this subwoofer, then from this subwoofer to the in-wall or
ceiling speaker pair.
Installation
1. For this type is installation, a stud finder such as MCM #22-9346 is highly recommended. This
device will not only accurately located both edges of the stud, but will provide a warning of nearby
electrical wiring.
2. When deciding on a final location to install speakers, extreme care should be taken to ensure that
obstructions do not exist, such as air ducts, plumbing and electrical wiring.
3. Locate the studs in the wall between which the speaker will be mounted. Using a pencil, mark a
spot directly in the center of the two studs
4. Locate the cardboard mounting template, included with the speaker, and using a tape measure,
determine its exact center point.
5. Poke a small hole in the template, and place the template on the wall, lining up the hole with the
spot marked on the ceiling. Using a level, make sure the template is level and plumb on the wall.
6. Trace the outer perimeter of the template with a pencil.
7. Using a wallboard saw, similar to MCM #22-7597, cut around this circumference. This type of saw
is especially useful, as its rigid design and sharp point allow it to “plunge” into the wall with no
need to drill a pilot hole.
8. Remove the rectangular section of drywall from the wall.
9. Remove the front grille from the speaker to be installed. This is most easily accomplished by
rotating the plastic mounting clips outward, and pressing then towards the front speaker frame.
This will cause the screw heads, behind the grill, to push the grill out from inside. In some cases,
it may be necessary to gently pry the grill from the front. This may be done with a small knife
blade or micro size flat blade screwdriver.
10. When looking at the rear of the speaker, rotate the six mounting clips clockwise as far as they well
go, so as not to obstruct the frame. If necessary, loosen the six mounting screws, from the front
of the speaker, to allow these clips to rotate freely within their bracket.
11. Locate the green terminal strip on the rear of the speaker, connections marked ( – ) and ( + ). This
is a two-part terminal strip, with the screw terminals being detachable from the PC board. Unplug
the screw-connector portion of the strip, allowing easy access to the screws. Strip ¼" of insulation
from the end of the speaker wire, insert into the terminal strip, and tighten the screws. Take care
to observe correct polarity. Then plug the terminal strip back into the PC board on the rear of the
speaker.
12. Fully insert the speaker into the wall opening and begin to tighten the six mounting screws. Care
should be taken when tightening these screws. Make sure the screwdriver is secure in the head of
the screw and does not slip out and damage the speaker cone.
13. As screws are tightened, the plastic mounting clips will rotate clockwise and draw in against the
inside of the wallboard. If using a drill to tighten screws, tighten all six until the speaker frame just
makes contact with the ceiling. From there, it is best to use a hand screwdriver to fully tighten.
This will prevent breakage of the plastic mounting clips.
14. Once all screws are tightened, the grill may be reinstalled on the front of the speaker.
Warranty
MCM Custom Audio and Stellar Labs products are warranted, by MCM Electronics, against
manufacturer defects for a period of two years from the original date of purchase. This warranty
is limited to manufacturer defects, in either materials or workmanship. MCM Electronics, or any
other worldwide divisions of Premier Farnell PLC, are not responsible for any consequential or
inconsequential damage to any other component, structure or the cost of installation or removal
of said items.
This warranty will not cover damage due to improper use such as (and not limited to) damaged
cones, mounting frames, voice coils or items damaged by whether damaged items.
For questions or specific information regarding warranty replacement or repair, contact:
MCM Electronics
www.mcmelectronics.com
800-543-4330
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