Samson DS70 User Manual
®
OWNERS MANUAL
SPEAKER DISTRIBUTION SYSTEM
Introduction 3
DS70 Features 3
Guided Tour 4
Modes of Operation 5
Wiring Diagrams 6
Four-Zone 70V (Unbridged) 6
Two-Zone 70V (Bridged) 7
Four-Zone 25.2V (Unbridged) 8
Two-Zone 100V (Bridged) 9
Two-Zone 140V (Bridged) 10
Appendix A: Block Diagram 11
Specifications 12
Introduction / DS70 Features
Congratulations on purchasing the Samson DS70 Speaker Distribution System!
The DS70 provides four high-quality toroidal step-up transformers in a single chassis.
Each transformer can accept a nominal-level signal from any standard power amplifier,
and can then convert it to a 70 volt, 25.2 volt, or 100 volt line-level output for use in
paging and public address systems and wherever long cable runs and multiple speakers
are required. Particularly well-matched to the Samson Servo Quad 4120 and Servo
Quad 4060 power amplifiers (which offer four discrete outputs), the DS70 can also be
used with any standard stereo or mono power amplifier delivering a signal of up to 120
watts per channel (into 4 ohms).
In this manual, we’ll provide you with an overview of DS70 features, followed by a
guided tour of its rear panel and a general discussion of the theory and application of
distributed sound. Also included is a series of wiring diagrams, a block diagram, and full
specifications. You’ll also find a warranty card enclosed—please don’t forget to fill it out
and mail it so that you can receive online technical support and so we can send you
updated information about this and other Samson products in the future.
SPECIAL NOTE: Should your DS70 ever require servicing, a
Return Authorization
number (RA) is necessary. Without this number, the unit will not be accepted. Please
call Samson at 1-800-372-6766 for a Return Authorization number prior to shipping your
DS70. Please retain the original packing materials and, if possible, return the DS70 in
its original carton and packing materials.
DS70 Features
•Used in conjunction with quality power amplifiers and speaker transformers, the
DS70 delivers audio fidelity far exceeding that usually obtained from high-impedance
distributed sound systems.
•No external power required.
•Flexible wiring configuration allows the DS70 to deliver various output level voltages,
including 70 volts, 25.2 volts, and 100 volts.
•Four independent channels of operation. Each channel can receive a separate
input signal (up to 120 watts) and each can output a signal at any of the available
voltages.
•Non-bridged modes of operation deliver up to 120 watts of power to each of four
discrete zones. Bridged modes of operation deliver up to 240 watts of power to each
of two discrete zones.
•A unique “Bridged 70 Volt” mode enables the use of two discrete
transformer-isolated lines which receive the same input signal. This not only
allows the level of each zone to be controlled independently, it also ensures that a
line failure in one zone does not affect the other one.
•Provision for custom 140 volt output where exceptionally long cable runs are
required.
•Binding post inputs and shrouded screw terminal outputs for convenient and reliable
connection to power amplifiers and speaker systems.
•Included heavy-duty rack ears allow the DS70 to be mounted in a standard 19" rack
(taking just two rack spaces), making it easy to integrate into any existing system.
3
Guided Tour
1: Channel inputs (1 - 4) - Connect output signal from a power amplifier to these four
sets of binding post input connectors, making sure to follow the polarity markings
silk-screened above each connector. When using the DS70 in two-zone (bridged)
modes of operation, a bridge connection must be physically made between two channel
inputs as silk-screened on the rear panel (i.e., between the negative terminal of the oddnumbered channel and the positive terminal of the even-numbered channel). See the
wiring diagrams on pages 6 and 7 in this manual for more information.
2: Channel outputs (1 - 4) - These four sets of screw terminal output connectors are
used to send signal from the DS70 to speaker transformers and loudspeakers. When
using the DS70 in two-zone (bridged) modes of operation, a bridge connection must be
physically made between two channel ouputs as silk-screened on the rear panel. See
the wiring diagrams on pages 6 and 7 in this manual for more information.
4
4 X 120W
TT 70
T SPEAKER DISTRIB
UTION SYSTEM
4 X 120W
ATT 70
VOLOLT SPEAKER DISTRIB
UTION SYSTEM
DS70
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
COMCOM25.2V70V
CH1 OUTPUT
BRIDGE 100V
INPUT
+
–
CH3 CH4
BRIDGE
–
+
COMCOM25.2V70V
CH3 OUTPUT
BRIDGE 100V
AVIS
RISQUE DE CHOC ELECTRONIQUE
NE PAS OUVRIR
DO NOT EXPOSE THIS EQUIPMENT
TO RAIN OR MOISTURE
BRIDGE 70V
NC100V
140V
CH4 OUTPUT
COMCOM25.2V70V
DS70
SPEAKER DISTRIBUTION
BRIDGE 70V
70V
NC100V
140V
CH2 OUTPUT
+
–
COMCOM25.2V
CH1 CH2
SAMSON
SAMSON TECHNOLOGIES CORP.
SPEAKER DISTRIBUTION SYSTEM
INPUT
BRIDGE
–
+
SERIAL NUMBER
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