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®
OWNERS MANUAL
POWERED
MIXER
SD8
Produced by On The Right Wavelength for Samson Technologies Corp.
Copyright 1997, Samson Technologies Corp.
Printed March 1997
Samson Technologies Corp.
575 Underhill Blvd.
P.O. Box 9031
Syosset, NY 11791-9031
Phone: 1-800-3-SAMSON (1-800-372-6766)
Fax: 516-364-3888
Introduction 1
SD8 Features 2
Guided Tour 4
Overview 4
Channel 5
Main Section 7
Rear Panel 9
Connecting The SD8 - General Suggestions 11
Setting Up and Using the SD8 12
Setting the Correct Gain Structure 13
Suggested Performance Application 15
Grounding Techniques 16
Using Equalization 17
Using The Aux Sends and Returns
and Monitor Output 19
Using the Internal Digital Signal Processor (DSP) 20
Table of SD8 Effects 21
Specifications 22
Introduction
Congratulations—you’ve made an excellent choice in your purchase of the
Samson SD8 Stereo Mixer Amplifier! In this manual, we’ll take you on a guided
tour through all the features of this powerful and flexible device, and we’ll tell you
how to get the most out of the SD8. Although designed for easy operation, we
suggest you take some time out first to go through these pages so you can fully
understand how we’ve implemented a number of unique features.
The SD8 combines a flexible multi-channel stereo mixer with a clean, powerful
250 watt per channel amplifier, 10-band graphic equalizer, and a Zoom digital
multi-effects processor—all in a single compact chassis that mounts easily in
any standard 19" rack. Simply plug in your microphones and line-level
instruments (such as keyboards, tape decks, CD players, etc.), connect the SD8
to any standard loudspeakers, and you’ve got a complete PA system suitable for
use in small clubs or similar environments, or in permanent installations such as
churches or conference rooms.
In these pages, we’ll begin with an overview of the main SD8 features, followed
by a guided tour of the front and rear panels. Then we’ll describe the various
input and output connections (including wiring diagrams) and tell you in detail
how to set up your SD8 and how best to use the unit in live performance.
Finally, we’ll cover a number of specific topics (such as grounding techniques,
using equalization and auxiliary sends and returns, and details about the
onboard multi-effects processor) and then wrap things up with 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 unit 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 unit. Please retain the original packing materials and, if
possible, return the unit in its original carton and packing materials.
1
SD8 Features
The Samson SD8 utilizes state-of-the-art technology in integrated mixer/amplifier
design. Here are some of its main features:
Convenient carrying handle and supplied standard 19" rack ears (the SD8
takes just four rack spaces) allows easy integration into any setup.
Eight independent channels, with both mic and line inputs for each channel.
This allows you to blend together a variety of source signals, including
dynamic or condenser microphones, keyboards, CD/tape players, etc.
Standard XLR mic connectors (for microphone inputs) and electronically
balanced 1/4" jacks (for line-level inputs) are provided for each channel;
in addition, there is a dedicated stereo CD/Tape input that provides dual
phono (RCA) jacks.
Full stereo control, with continuously adjustable Pan controls for each
channel that enable you to place each input signal independently in the
left-right plane.
Power to spare—a full 250 watts per channel into four ohms. Any standard
speaker cabinets (four, eight, or sixteen ohms) can be connected to the four
rear-panel 1/4" speaker output jacks.
A built-in Zoom Digital Signal Processor allows you to add a wide variety
of professional-quality effects without having to use an expensive external
signal processor. A front-panel DSP Mix Level control allows you to
precisely define the amount of effects to be blended into the signal.
Independent three-band equalization for each channel, enabling you to
shape the sound of your input signal sources. In addition, a ten-band
graphic master equalizer allows you to “tune” the output of the SD8 to the
particular room environment you are in. This can be particularly useful for
eliminating ringing or feedback problems.
Continuously adjustable wide-range input Trim and Level controls for
each channel allow you to precisely set the correct input and output gain
structure.
Peak LEDs for each channel show you at a glance when an input signal is
on the verge of overloading. Other front-panel LEDs show the current status
of the amplifier’s protection relay circuitry and whether or not phantom power
is being applied to attached microphones.
Two Aux sends per channel (one pre-fade and the other post-fade) allow
you to route multiple signals to the internal DSP, to a dedicated Monitor
output, or to external signal processors. The Monitor output enables you to
set up an onstage monitor mix that is independent of the main house mix.
A separate Monitor level control is provided on the front panel.
Two Aux returns—with a dedicated front-panel Aux return level control—give
you the ability to blend in the return signal from external signal processors or
other line-level devices without having to utilize input channels.
A phantom power switch enables you to use the SD8 with high-quality
condenser microphones or active DI boxes. When turned on, 48 volts of
phantom power is provided to the mic connectors of all input channels.
2
SD8 Features
Protection relay circuitry prevents “thumps” when powering on or off. This
means that you can use the SD8 with a single power strip into which other
audio devices are connected, without danger of damage to connected
speakers.
A rear-panel amplifier input allows you to bring external signals from other
mixers or audio devices into the SD8 power amplifier.
A rear-panel preamplifier output allows you to connect the SD8 to external
power amplifiers when higher power ratings are required and/or when
additional amplifier feeds are necessary.
A built-in headphone amplifier, complete with a front-panel 1/4" stereo
connector and dedicated level control, allows you to monitor your main mix.
A convenient front-panel meter that allows you to see at a glance the
continuous output signal level.
We’ll elaborate on many of these terms and features later in this manual.
Now it’s time to take a guided tour of the SD8.
3
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