DS1390
Soundmasking / Paging Speaker
General Information
The DS1390 plenum masker is a complete loudspeaker assembly ready for installation, either in an open
structure oce facility or above suspended ceilings. The unit is composed of a six-inch diameter loudspeaker,
metallic back box, 70V transformer, and volume control. The unit should be wired to a power amplier with a
70.7 V output.
Unpacking
The plenum maskers are carefully tested before leaving the factory. Inspect both the units and their shipping
container for indication of improper handling. Report any equipment damage to the distributor immediately. If
the unit was shipped to you, notify the shipping carrier without delay and place your claim. Unpack the unit. It is
ready to be installed.
Tools Required
• Ladder, Wire strippers, Crimp Connectors, Flat headed screwdriver, others depending on attachment meth-
od
• Hanging wire or chain, as preferred
• 18 Gauge twisted pair wire for electrical connection
Field Maintenance
No maintenance is required on these maskers other than possible repair of a wire broken during installation.
The output level of the unit can be changed, if necessary, by rotating the volume control on the body of the
housing. If the speakers fail to make sound on initial installation, check for an open or shorted home run wire.
Check to make sure the amplier has an output voltage when the home run wire is disconnected. If the zone
wire has a short, the amplier output fuse may have failed to protect the unit.
Mechanical Installation
The eyebolt on the DS1390 provides a single point suspension. Determine the correct method for attaching
the hanging wire to the structure above the ceiling. Typically, the method used to hang ceiling grid is the best
for speaker installation. For example, hangers can be shot into concrete structures or suspension wire can
be wrapped around bar joists in metal ceiling structures. Set the volume control on each speaker at 1 W (one
Watt). Determine the locations for the speakers and open the appropriate ceiling tiles. Inspect the plenum for
places to hang the speaker. It is always preferable to independently hang the speaker assembly. Cut a length
of hanging wire such that the speaker may be hung from the chosen location.
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Electrical Connection
All speakers will be connected in parallel. Run the zone wiring so that the
wires pass each speaker. Start at the speaker at the end of the zone. Strip
the two zone wires. Twist the black wires together and twist the red (or
white) wires together. Put a crimp connector on each connection to stu the
connections into the speaker, and then screw down the strain relief clamp.
Verify the speaker is on the 1 W setting. Move to the next speaker and pull up
any slack from the previous speaker, and then cut the zone wire. The zone
wire should be suspended well above the ceiling and not left in loose loops.
Some local codes require the wire to be suspended between the speakers.
Use re-rated wire ties, where required by code, to dress the zone wires to
speaker suspensions and to ceiling attachments. Strip both ends to twist all
black wires together and twist all red (or white) wires together.
Proper Installation Techniques
All electrical connections should be inserted into the speaker enclosure before
tightening the strain relief. In addition, the wires should be attached to the
hanging wire, using wire ties, as illustrated.
Fastening the lead wires at these two points while adjusting the speaker to
be level is normally all that is needed to keep the speaker in the appropriate
position.
Leaving the speaker connections outside the enclosure is bad wiring practice,
and provides less ability to level the speaker.
In some cases where there is diculty getting the speaker to hang correctly,
the balance of the speaker can be changed by bending the eyebolt, very
slightly, in the direction of the low point of the speaker.
It is not critical that the speaker be perfectly level, other than for aesthetic
reasons.
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Warranty
This product is warranted to be free of defects in materials and workmanship for one year. This warranty is
TERMINATED if the unit indicates that it was subjected to abuse, unauthorized modications, accident, or
alterations of any kind, or way. Any components of this product, which with normal installation and use become
defective, will be either repaired or replaced at Dynasound’s discretion. This equipment must be delivered or
shipped, prepaid and insured, to our authorized service center, or to the Dynasound service department, after
obtaining a Return Authorization. Said Return Authorization may be obtained by mail or telephone, and should
be clearly marked on the accompanying paperwork. Any changes in product not approved by Dynasound shall
VOID this warranty.
Dynasound is not liable for consequential damages. This warranty is in lieu of all other warranties, expressed
or implied, including, but not limited to, the implied warranties of merchantability and tness for a particular
purpose, and no representative nor person is authorized to assume for Dynasound any other liability in
connection with the sale or installation of our products.
Warranty Repair
Dynasound warrants its products from internal failure in normal use for one (1) year, and will repair units
within warranty with out charge. For specics, see the appended Warranty. Improper functioning, for warranty
purposes, means failure of the unit to generate masking sound due to defects not caused by the Owner. It
does not include such Owner caused malfunctions as accidental turning o of the system, readjustment of the
controls, retuning of the system, shorting the zone wiring, or injury to the unit beyond normal wear. The owner
must pay freight to return the unit and Dynasound will pay the freight for return. For Non-warranty repair, the
owner must pay freight to return the unit. If the customer has credit, Dynasound will repair the unit and return it
with an invoice for both the repair and return freight charges. If credit has not been established, the repair and
return will be COD. Dynasound will notify the owner after any factory service whether it was a warranty repair
or not.
The factory service facility is:
Dynasound, Inc.
6439 Atlantic Blvd.
Norcross, GA 30071
Tel: (770) 242-8176
Tel: (800) 989-6275
cambridgesound.com 800.218.8199
Dynasound is either a trademark or registered trademark of Biamp Systems, LLC in the United States and other countries. Other product names referenced may be trademarks or registered marks of
their respective owners and Biamp Systems is not aliated with or sponsored by these companies. All specications are subject to change.
Visit cambridgesound.com for the latest specication information.
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