Atlas Sound WHISPERTOUCH DWT-8 - Manual (Page 2)

Specifications subject to change without notice
© 2001 Atlas Sound LP Printed in U.S.A. 000801 PN 389516 SL4-1570
1601 JACK MCKAY BLVD. / ENNIS, TEXAS 75119 U.S.A. / TELEPHONE: (800) 876-3333 / FAX (800) 765-3435
Stereo Amplifier / Receiver
capable of handling a 2-ohm load
AMP SUPPLY
L-
L+
R+
R-
Connect additional volume controls
if desired. Confirm maximum quantity
by referencing the impedance
chart on front side.
REFERENCES TO WHISPERTOUCH ON THIS THIS INSTALL SHEET APPLY ONLY TO MODEL DWT-8
“Daisy Chain”
Wiring
These diagrams show examples of a sys-
tem that uses 8-ohm loudspeakers and an
amplifier capable of handling a 2-ohm load.
Set each WhisperTouch volume control
impedance jumper according to the chart
on the front of this sheet.
The wiring depicts how volume controls
can be daisy chained or wired in home run
fashion from each volume control to the
amplifier.
"MEL" Main Equipment Location
Connector
Block
Stereo Amplifier / Receiver
capable of handling a 2-ohm load
AMP SUPPLY
L-
L+
R+
R-
Connect additional volume controls
if desired. Confirm maximum quantity
by referencing the impedance
chart on front side.
“Home Run”
Wiring
INSTALLATION
INSTRUCTIONS
FOR WHISPERTOUCH
MODELS DWT-8
Mounting Location:
Volume controls should be placed in accessible
wall locations that are close to entryways, exits,
light switches, or telephones. They may also be
ganged with other low voltage* controls such as
keypads or infrared repeaters.
*Note: WhisperTouch should not be mounted into
the same electrical box used for a 110-volt device
—even if the box says it is partitioned for this pur-
pose. Speaker wires may pick up electrical noise
which will be transmitted as a buzzing or popping
sound to the loudspeakers.
Mounting Requirements:
Switched WhisperTouch units are slightly taller,
wider, and deeper than most volume controls and
requires a 20 cu in. E.O. box with a minimum
inside depth of 2.75" and a minimum inside height
of 2.985". Recommended boxes for new construc-
tion include: Carlon PVC switch box #B-120A, and
RACO PVC outlet box. For retrofit applications,
CADDY drywall trim ring #MPLS may be used.
Calculating the proper Impedance
settings for the system:
WhisperTouch is an impedance-matching stereo vol-
ume control that allows multiple loudspeaker pairs
and
volume controls to be connected, in parallel, without
the additional cost of a separate impedance-match-
ing device. For flexibility in system design,
WhisperTouch has three impedance matching capa-
bilities: 2X, 4X and 8X, as well as a 1X non-imped-
ance matching setting that allows the unit to be used
as a standard 8 Ohm
volume control.
To determine which setting should be used (1X, 2X,
4X and 8X) you will need to know the number of
loudspeaker pairs, the loudspeaker impedance,
and the load capability (output impedance) of the
amplifier. Most amplifiers will handle a load down to
four or two ohms with some going as low as 1 ohm.
Using the chart on page one; cross reference the
number of loudspeaker pairs to the amplifier imped-
ance. Notice that the 4X jumper setting will allow
twice as many loudspeaker pairs.
Example: If you have 8 pairs of 8-ohm loudspeak-
ers and an amplifier capable of handling a 4 ohm
load you must set WhisperTouch at the 4X setting
for the amplifier to drive all 8 pairs of speakers at
full volume. Note that the 2X setting allows only 4
pairs of 8-ohm loudspeakers to operate on a 4 ohm
load. If however, you could select an amplifier with
a 2 ohm output impedance, the same 8 loudspeak-
ers could operate on a 2 ohm load (at the 2X set-
ting) or 16 loudspeaker pairs (at the 4X setting).
Whenever possible, the lowest jumper setting for a
given amplifier should be selected.
Changing Impedance Jumpers:
Once the proper impedance setting is determined,
locate the impedance jumpers (black plastic mod-
ules) on the back side of the circuit board. One
jumper is for the right channel, the other for the left.
Next, locate the 1X, 2X, 4X and 8X settings on the
circuit board for each channel. If the settings are
correct, continue to the next step. If the settings
need to change, simply slide the jumper modules
off and reinstall them on to the correct two pins.
Limitations:
WhisperTouch limits the degree of impedance match-
ing to eight times so that music quality and overall
performance is not sacrificed. We do not recommend
that any quality, multi-room music system be con-
nected to a device which provides 16X impedance
matching as it may limit the amplifier’s power and
system performance.
Prewiring and Installation:
A.Mount the outlet box or plaster ring in the wall
(see mounting requirements). Each room’s wiring
can be individually run back to the amplifier (home
run) or connected from one room to the other
(daisy chain). The daisy chain wiring method con-
nects one set of speakers with volume control in
parallel to the next, using connection block or
crimp connectors in between. This method has the
advantage of requiring less wiring for the system
rough-in, but allows for little or no system upgrad-
ing for future applications.
With either method, be sure to mark the cable con-
nected to the amplifier as [INPUT] and write down
the color codes you have designated for the left
channel, right channel, positive, and negative leads.
B.If using the "Home Run" wiring method, each
rooms speaker/volume control wiring should be indi-
vidually run back to the Main Equipment Location
"MEL" in a "home-run" fashion. Run a total of four
conductors of speaker cable from the amplifier loca-
tion to each room's volume control box.
Note: Many building and fire codes require cable
to be CL-2, CL-3, or FT4 rated. Check with your
local building inspector before prewiring.
C..Next, run a two-conductor speaker cable from
the outlet box to the corresponding left and right
speakers. Mark each cable [LEFT] and [RIGHT]
and determine the polarity of each channel (posi-
tive and negative).
D..Cut the cable accordingly, allowing enough cable
to hang outside the outlet box, to properly connect
the volume control. Tuck the cable back into the
outlet box to prevent damage during drywall instal-
lation.
E. If desired, the terminal block may be removed
from the volume control to more easily accomodate
wiring. Strip 1/4" of insulation off each conductor
and insert the wires into the terminal block. Tighten
the terminal block screws frimly and re-install the
terminal block onto the pins.
F. Tuck the excess cable from inside the outlet box
back out into the wall or fold wires carefully while
inserting the volume control into the outlet box.
Position the volume control so that the front bracket
lines up with the mounting holes on the box. In
some cases, WhisperTouch may be a tight fit
requiring it to be inserted on the right side of the
outlet box and then slid left into the center position.
Note: In retrofit applications, metal extension plates
and non-recommended outlet boxes may require
field modification to accept the units’ higher and
deeper profile.
G. Secure unit with supplied screws. We recom-
mend loosening the screws 1/4 turn to allow 1/4"
movement side-to-side and front-to-back. This will
allow the face plate to fit flush when the cover plate
is installed.
H.Mount the cover plate and tighten the screws.