Wāvtech Steg SDSP68 User manual

Car Audio DSP
USER'S GUIDE
SDSP68
8-CHANNEL DIGITAL SIGNAL PROCESSOR

• DO NOT DRIVE WHILE DISTRACTED. Any function that requires your prolonged attention should not be performed
while driving. Always stop the vehicle in a safe location before performing any such function. Failure to do so may result
in an accident.
• KEEP THE VOLUME AT MODERATE LEVELS WHILE DRIVING. Excess volume levels can obscure sounds such as
emergency vehicle sirens or road warning signals and may result in an accident. Continuous exposure to high sound
pressure levels may cause permanent hearing loss. Use common sense and practice safe sound.
• FOR USE WITH 12V NEGATIVE GROUND VEHICLE APPLICATIONS ONLY. Using this product other than in its designed
application may result in fire, injury or product damage.
•MAKE THE CORRECT WIRING CONNECTIONS AND USE PROPER FUSE PROTECTION. Failure to connect wiring
correctly with appropriate gauge and fuse protection may result in fire, injury or product damage . Ensure proper
protection of all system power wiring and install an external fuse (not included) of the specified rating with the +12V lead
at the vehicle’s main battery terminal.
• DISCONNECT THE NEGATIVE BATTERY TERMINAL BEFORE INSTALLATION. Failure to do so may result in fire, injury or
damage to the unit.
• D O NOT ALLOW CABLES TO BECOME ENTANGLED IN SURROUNDING OBJECTS. Arrange wiring and cables to prevent
obstructions when driving. Cables or wiring that obstruct or hang up on places such as steering wheel, brake pedals, etc.
can be extremely hazardous.
• DO NOT DAMAGE VEHICLE SYSTEMS OR WIRING WHEN DRILLING HOLES. When drilling holes in the chassis for
installation, take precautions so as not to contact, puncture or obstruct brake lines, fuel lines, fuel tanks, electrical wiring,
etc. Failure to take such precautions may result in fire or an accident.
• DO NOT UTILIZE OR CONNECT TO ANY PART OF VEHICLE SAFETY SYSTEMS. Bolts, nuts or wires used in the brake,
airbag, steering or any other safety-related systems or fuel tanks should NEVER be used for mounting, power or ground
connections. Using such parts may disable control of the vehicle or result in fire.
WARNING
WARNING This symbol means important instructions.
Failure to heed them can result in serious injury or death.
CAUTION This symbol means important instructions.
Failure to heed them can result in injury or property damages.
• STOP USE IMMEDIATELY IF A PROBLEM OCCURS. Failure to do so may result in personal injury or damage to the
product. Return it to your authorized STEG dealer.
• HAVE AN EXPERT DO THE WIRING AND INSTALLATION. This unit requires special technical skill and experience for
wiring and installation. To insure safety and proper function, always contact the authorized STEG dealer where you
purchased the product to have it done professionally.
• INSTALL THE UNIT SECURELY WITH SPECIFIED PARTS. Be sure to use only the included parts and specified installation
accessories (not included). Use of other than designated parts may damage this unit. Install the unit securely so that it
will not come loose during a collision or sudden jolt.
• ROUTE WIRING AWAY FROM SHARP EDGES AND MOVING PARTS. Arrange cables and wiring away from sharp or
pointed edges and avoid moving parts such as seat hinges or rails to prevent pinching or wear. Use loom protection
where appropriate and always use a grommet for any wiring routed through metal.
• NEVER RUN SYSTEM WIRING OUTSIDE OR UNDERNEATH THE VEHICLE. All wiring must be routed, secured and
protected inside the vehicle. Failure to do so may result in fire, injury or property damage.
• INSTALL THE UNIT IN A DRY AND VENTILATED LOCATION. Avoid mounting locations where the unit will likely be
exposed to high moisture or heat without adequate ventilation. Moisture penetration or heat buildup may result in
product failure.
• REDUCE GAIN AND SOURCE VOLUME TO MINIMUM LEVELS FOR INITIAL SYSTEM TUNING. Ensure amplifier power is
off before connecting signal cables and follow proper system gain setting procedures. Failure to do so may result in
damage to the unit and/or connected components.
CAUTION
1
Package Contents:
Main Unit
Accessories Required for
Installation (not included):
ŸWindows PC w/USB Port
ŸRCA Interconnects
ŸPower/Ground/Remote Wire
ŸIn-line Fuse Holder w/Fuse
ŸBattery Ring Terminal
ŸChassis Ground Terminal
ŸWire Crimp Connectors
ŸGrommets and Loom
ŸCable Ties
Mounting Screws
PC Software
(USB Flash Drive)
USB Cable
High-Level Input Harness
Power Supply Harness

INTRODUCTION
Thanks and congratulations for choosing STEG for your digital signal processing
needs. These processors have been significantly improved throughout the years in
order to assure quality and reliability. The latest technology has been incorporated
into every product, providing you with unparalleled sound quality. Our highly
developed circuitry contributes to low distortion and the ultimate in tuning flexibility.
That's why we are sure that your new DSP will provide you with a sound value you can
enjoy for years to come.
2
Note: All specifications are subject to change without notice.
4.7” (120mm)
1.5" (39mm)
7.75” (197mm)
7.1” (179mm)
SDSP68
Frequency Response +0.5/-3dB 20Hz to 35kHz
Digital In, 2V / 5V out 98dBA / 106dBA
Analog In, 2V / 5V out 90dBA / 98dBA
Distortion (THD+N) at 2V / 5V output 0.005% / 0.2%
High Level
15Ω
RCA / AUX
22kΩ
High Level (max input) 10.5V
RCA / AUX (min-max input) 1.2-4.8V
RCA Output Voltage at 1% THD+N >5Vrms
450Ω
via REM IN >2.8VDC
DC-Offset >4VDC
Remote Output Current Capacity 130mA
Fuse Rating External (not incl.) 2A
Idle Current (w/o REM OUT) 0.8A
Sleep Current 0.2mA
Operating Voltage DC Supply 8 - 18V
7.75"x4.7"x1.5"
197x120x39mm
Turn-On Trigger
RCA Output Impedance
Specifications
Dimensions (LxWxH)
Input Sensitivity
Input Impedance
S/N Ratio
Current Draw

3
WIRING & CONNECTIONS
It is important to read this manual thoroughly before starting your installation and always plan accordingly.
Before installing, disconnect the negative (ground) wire from the vehicle’s battery to avoid damage to the
vehicle or yourself. Following all guidelines will help provide years of enjoyment with your S .TEG DSP
Power Supply:
Œ
Ground (GND): The ground wire must be connected to a metal part of the vehicle with ground plane
Ÿ
back to the main battery ground attachment point (a.k.a. chassis ground). This wire should be as short
as possible, but no longer than 2ft (60cm), with minimum gauge of 18AWG. The ground wire should be
terminated with a ground specific or ring terminal and securely bolted to the vehicle with star or lock
washer and nut to prevent from coming loose. The chassis ground connection point should be scuffed
to the bare metal.
ŸPower (+12V): The constant +12V power connection should be made at the vehicle’s main battery,
securely connected with a ring terminal and protected with an in-line fuse within 18in (45cm) from the
positive battery terminal. The SDSP68 requires a 2A external fuse (not included) with minimum wire
gauge of 18AWG. Do not install the fuse until all other system connections have been made.
ŸRemote Turn-On (REM IN): If the source unit has a remote output wire or if a switched ignition wire is
available, connect it to the REM IN wire for turning on the amplifier and select ACC from the turn-on
mode switch .
~
ŸRemote Output (REM OUT): This wire provides a +12V remote output trigger for turning on amplifiers
or other related audio equipment, and is also capable of driving a standard 12V automotive relay.
RCA Outputs: These RCA jacks are for connecting up to 8-channels of line level signal outputs from the
SDSP68 to external amplifier(s). Use quality interconnects to ensure stable connections and minimize
the possibility for induced noise.
USB PC Control: This USB Type-B port is for connecting to a Windows PC with the supplied cable to run
Ž
the DSP tuning software and make changes to the internal settings. Note that if the optional DRC
remote is also connected, it is recommended to not use it while connected to the PC software.
Bluetooth:
 This USB terminal is for connecting the optional Bluetooth dongle (sold separately) and is
selectable as the BT source via the PC software section ② or optional DRC remote.
Remote Control: J jack
 This R 45 is for connecting the optional DRC digital remote controller (sold
separately), which remote control of the SDSP68 provides for source select, master volume, sub volume,
mute and preset load.
Optical Input:
‘ This port is for connecting an external digital source with an optical (Toslink) cable and is
selectable as the SPDIF source via the PC software section ② or optional DRC.
’Coax Input: This RCA jack is for connecting an external digital source with a coaxial cable and is
selectable as the COAX source via the PC software section ② or optional DRC.
High-Level Inputs:
“ This terminal/harness is for connecting up to a 6-channel high-level source such as
a factory radio or amplifier, and is selectable as the MAIN source via the PC software section ② or
optional DRC remote. Note that if the source’s output signal voltage exceeds 10.5Vrms, a external line
output converter should be used and connected via the RCA input jacks instead. Also note that
}
although the harness provides an audio ground wire labeled GND, it should never be connected except
in the extremely rare case of a common ground source.
”RCA Inputs: These RCA input jacks are for connecting up to a 6-channel line level source such as an
aftermarket radio and is selectable as the MAIN source via the PC software section ② or optional DRC.
Use quality interconnects to ensure stable connections and minimize the possibility for induced noise.
•Auxiliary Input: This 3.5mm input jack is for connecting a low level source such as portable MP3 player
or smartphone and is selectable as the AUX source via the PC software section ② or optional DRC.
Turn-on Mode Select:
• This switch is for selecting which method is used for turning on the DSP. The
default setting ACC is for a switched +12V wire connected to the REM IN wire. If a wired trigger is
unavailable, select AUTO for detection from the high-level inputs for automatic turn-on. If the DC-offset
high level inputs or the source does not contain DC-offset, a +12V switched trigger are not used
connected to REM IN will be required.
Power LED:
•This LED indicates when the DSP is turned on. If not illuminated, check the power, ground
and remote wire connections and external fuse accordingly. If using the AUTO setting of the turn-on
mode switch for a high-level source and the unit does not turn on, it likely means there is no DC-
~
offset signal present and a remote wire will need to be connected to the REM IN wire with the switch set
to ACC instead.
Notes:
ŸAlthough both high-level and RCA inputs are provided, only one may be connected at a time, as they
share the same assigned MAIN input source and are not independently selectable.
ŸIf more than one source is connected, the optional DRC remote is required to change sources without the
PC software. If only one source is connected, select it from the PC software during initial setup.

SDSP68
GND
+12V
4
SDSP68
Œ  Ž
<2ft
(60cm)
High Level Input Harness:
Power Supply Harness:
FL INPUT White
White/Black
-
+
Gray
Gray/Black
-
+
Black
GND
FR INPUT
-
+
RL INPUT Green
Green/Black
-
+
RR INPUT Purple
Purple/Black
-
+
SUB-L INPUT
-
+
SUB-R INPUT
Brown
Brown/Black
Blue
Blue/Black
Yellow
Blue
Black
REM OUT
Red
+12V
GND
REM IN
REM OUTGND
REM IN 12V
<18in (45cm)
External
Fuse: 2A
  ‘ ’
•
”
“

5
Installation Notes
Vehicle Description
ŸYear, Make, Model:
ŸTrim Level / Package:
OEM/Aftermarket System Info
ŸHead Unit:
ŸAmplifiers:
ŸSpeakers:
ŸSubwoofer(s):
ŸOther:
SDSP68 Connections & Settings
ŸConnected Source(s):
ŸSystem Wiring:
Ÿ Channel Routing/Assignments:
ŸCrossovers:
ŸPEQ:
ŸTime Delay/Phase:
ŸPresets (POS1-POS8):
System Diagram

6
Notes:
ŸIf more than one source is connected, the optional DRC remote is required to change between sources.
ŸThe SDSP PC software is only recommended for use with authentic licensed versions of Windows.
ŸAll specifications are subject to change without notice.
DSP Features & Specifications
DSP Resolution
Sampling Rate
Signal Converters
A/D and D/A
Input Source Select via PC or DRC
Main (High Level)
AUX, BT, Optical, Coax
Main (High Level)
AUX, BT, Optical, Coax
Output Channel Assignments
Front
Rear
Center
Subwoofer
Filter Model
Filter Type
Filter Range
Filter Slope
Main
Sub
Each Channel
Delay Range
Increments
Phase Shift Range
Type
Freq (Fc) Range
Boost/Cut Range
Q Range
Preset Memory
Software Interface
-40dB to +12dB
0dB to +12dB
SDSP68
up to 8 (POS1-POS8)
Windows PC Required (Windows 8 &10)
Time Delay
0-15ms, 0-519cm, 0-204in
0.01ms, 0.35cm, 0.14in
0° to 360° (1° steps)
EQ
31-band Parametric
20Hz to 20kHz
+/-15dB
0.3 to 15 (in 0.1 steps)
-40dB to 0dB
Input Channel Routing
Null, FL, FR, RL, RR, SUB L, SUB R
M1=FL+FR, M2=FL+RL, M3=FR+RR
M4=FL+RL+SUB L, M5=FR+RR+SUB R
Null, Left, Right, M1=Left+Right
Front, Rear, Center, Subwoofer (CH7/8)
Output Channel Pre-set
Crossover Configurations
Full, Tweeter, M-T, Midrange, M-WF, Woofer
Full, Tweeter, Woofer
Full, Tweeter, Woofer
Subwoofer (stereo), Full, SubwooferS (mono)
Crossover
Linkwitz, Bessel, Butterworth
Off, HP, BP, LP
20Hz to 20kHz
Linkwitz = -12, -24, -36, -48dB/oct.
Bessel = -12, -24, -36, -48dB/oct
Butterworth = -6, -12, -18, -24, -36, -48dB/oct
Trim Level (Gain)
Input Channel Setting
2ch, 4ch, 6ch, Mix (Mono, 2-way or 3-way sum)
32-Bit
96kHz
Burr-Brown
Main (High Level or RCA), AUX, BT, Optical, Coax
2ch

7
1.Install the SDSP68 PC software from the included USB flash drive.
2.Launch the program from the desktop icon and select “Offline-Mode” from the opening window.
3.Power on the source and main DSP unit. For additional speaker protection, turn the source unit volume all
the way down until initial crossover and channel configuration settings are made.
4.Connect the supplied USB cable from the main unit to the PC and select “CONNECT” from the file menu.
SOFTWARE INSTALLATION
Once the DSP tuning software is open and connected to the main unit, any adjustments will be made to
the DSP in real time. It is recommended to periodically save your settings via the File menu ① to a preset
(POS1-POS8) and as a *.PAR setup file to the PC as backup once all settings and presets have been written.
Please familiarize yourself with the available settings for each software function section and carefully
consider the appropriate settings and adjustments for your connected source(s) and speakers. If your
system configuration is different than the factory default settings, it is recommended to first assign speaker
type for each OUTPUT channel to automatically apply pre-set crossovers to provide initial protection for ④
sensitive speakers such as tweeters until further tuning is completed. Next choose the CH SETTING for a ③
pre-set input configuration or use section to select ④
the appropriate INPUT channel routing for your high
level or line level source. All of these settings can be
manually adjusted and fine tuned later as needed.
Note that if the optional DRC remote is also connected,
it is recommended to not make any adjustments from it
while connected to the PC tuning software.
DSP SOFTWARE & SETTINGS
➁
➂
➃
➄ ➅ ➆
➀
➇

8
Preset Save/Load: Up to 8 presets can be saved (Write To Device) to the POS1-POS8 buttons, where

they can be loaded from memory later (Read From Device) to override the current DSP and PC software
settings. Note that master and sub volume settings are not saved to presets and will be overridden if
adjustments are made from the optional DRC remote or if any changes are made from the tuning
software after loading a preset. Also note that all current presets are preserved in the *.PAR parameter
setting file if saved to the PC as a backup.
Source Select: This section provides for direct selection of the input source. The currently selected
‚
source name will be highlighted. The default source selection is MAIN, which corresponds to the high-
level or RCA inputs (only one or the other can be connected, not both). To change source without the PC
software connected, the optional DRC is required.
Input Channel Select: This section provides a quick method for setting the MAIN source input channel
ƒ
configuration as 2CH, 4CH, 6CH or MIX (3-way sum). To customize signal routing for individual channels,
use the settings in section ④. Note that although the high-level and RCA inputs are assigned as the
MAIN source, they must not be connected simultaneously.
Input Channel Routing, Output Channel Assignment and Pink Noise Generator: In this section, all
„
input to output signal routing and assignments can be made for each individual channel, or channel
pairs if linked, as well as generate pink noise to the selected output channel(s) for the purpose of tuning
the vehicle acoustically with an RTA or audio spectrum analyzer.
For input signal routing, the drop down tabs under the INPUT column contains selections for FL, FR, RL,
Ÿ
RR, Sub L, Sub R channels connected to the high-level or the RCA inputs. Any input channel can be
assigned to any output channel, or mixed (summed) for the purpose of creating full-range signals from
2-way or 3-way factory signals, creating a mono signal for center or sub, or a non-faded output by
summing front and rear input signals.
For output channel assignments, use the drop down tabs under the OUTPUT column. Selecting a
Ÿ
particular channel output assignment is for the purpose of master volume and sub volume control
from the PC software or optional DRC. Assignments can be made in any order except for CH7/8, which
are the only channels assignable as Subwoofer and thereby controlled by the sub volume adjustment.
For speaker type assignment, each available choice provides a pre-set crossover that will be applied for
Ÿ
the purpose of initial protection until full system tuning adjustments are made. Any crossover can be
adjusted manually afterward in section ⑤ or from the graph in section ⑧.
For convenience in making acoustic measurements, a pink noise generator is available for each output
Ÿ
channel under the TEST column. When activated, the input signal is temporarily bypassed to provide
pink noise from the selected output channels.
Crossover Model, Type, Slope and Frequency: This section is for selecting crossover model, type, slope
…
and frequency for the currently selected channel in section ②. Crossover type is selectable as OFF, HP, LP
or BP, which activates both HP and LP crossovers simultaneously as a bandpass. Cut-off frequency can be
entered manually in the numerical value boxes or from the sliders in this section, as well as via the graph
in section ⑧. In addition to crossover type and frequency adjustments, this section also allows selection
of filter model (Linkwitz, Bessel or Butterworth), each of which provides a different filter Q, slope options
and associated phase response. Note that slopes not available for the currently selected filter model will
not be displayed or allowed to be entered until the filter model is changed.
Master Volume, Sub Volume and Channel Trim Levels: This section is for adjusting individual channel
†
trim levels as well as master and sub volume. The individual channel trims are for adjusting each
channel’s output level relative to the other channels for the purpose of tuning the system with the
connected amplifiers and speakers in the vehicle. The master volume slider is for adjusting output
volume of all channels together, while the sub volume will only affect CH7/8 relative to the master
volume up to +12dB if assigned as Subwoofer channels in section ④. Volume adjustments may also be
made via the optional DRC when not connected to the PC software but any changes made here will
override the last DRC volume settings.
Time Delay and Phase Shift: This section is for adjusting time delay and phase shift for each channel.
‡
Delay increments can be chosen as time in milliseconds (MS) or as distance in centimeters (CM) or inches
(INCH). After adjusting for imaging with individual channels, channels may then be linked for adjusting
together while keeping their individual delay settings, simplifying tasks such as delaying main speakers
relative to subwoofer(s) in order to achieve up-front bass and better staging. Phase shift can be applied
in 1 degree increments to individual channels without affecting the time delay settings, and therefore
o
can used to adjust each channel’s relative phase or flip polarity if changed by 180 .
Parametric EQ and Frequency Response Graph: This section contains 31 bands of parametric EQ
ˆ
adjustments for each output channel, as well as providing a visual representation of all crossover and
PEQ settings for the currently selected channel in section ④. Boost/cut, frequency and Q (width) of each
PEQ band can be set by the sliders or entered manually into the numerical value boxes, while boost/cut
and center frequency of each band can also be dragged by mouse on the graph. Crossover adjustments
can be made here as well by dragging the H (high-pass) or L (low-pass) markers, and will show the
current cut-off frequency while being adjusted.

9
SYSTEM EXAMPLE-1:
SYSTEM EXAMPLE-2:
FL/FR IN
RL/RR IN
+12V
REM IN
REM
OUT
CH1/2/3/4 OUT
CH5/6
OUT
CH7/8
OUT
DRC
+12V
REM IN
REM OUT
CH1/2/3/4 & CH7/8 OUT
CH1/2 OUT
DRC
COAX IN
FL/FR/RL/RR/SUB-L/SUB-R IN
CH7/8 OUT
CH3/4 OUT
Note: In this system example, an aftermarket head unit is connected to the SDSP68 via its RCA inputs as the
MAIN source, while a high-res digital audio player is connected to the COAX input. Since more than one
source is connected, the DRC remote is required in order to change sources. With the 5-channel amp in this
example, only 6-channels of output are needed for the front components w/passive crossovers, rear coaxials
and a subwoofer. The front and rear speaker OUTPUT type is chosen as full-range since the high-pass filters
are applied manually. CH7/8 are assigned as mono subwoofer channels so the DRC remote can control the
sub volume for both the MAIN and COAX sources. Since the COAX source is 2-channel, is left and right
channels are routed to all channels when selected, but the same crossovers, trim levels, etc. apply.
Note: In this system example, all 8-channels of the SDSP68 outputs are used for bi-amped front 2-way
components, rear coaxials and a subwoofer. The signal feeding CH1/2 and CH3/4 outputs is derived from
the front channels and then crossed over for the 2-way components, while CH7/8 is derived as a sum of the
front and rear input signals from the 4-channel source as shown. CH7/8 are assigned as subwoofer channels
for the purpose of sub volume control from the optional DRC remote.

Warranty & Service Care
GT Trading warrants this product to be free from manufacturing defects for a period of one (1) year from
original date of purchase. Under this warranty, Wāvtech will replace the defective product on behalf of GT
Trading with a new or remanufactured one at no charge.
For speakers and component sets, only return the defective part. Do not return the other speaker, tweeter
or crossover as they will be retuned back to you. This warranty covers manufacturing defects only.
Wāvtech will test each item received to verify there is a defect. If no defect is found, the item will be
returned to dealer. Items misused, altered, or neglected are not covered. Wāvtech will not be liable for any
loss, cost of repair or any other damage of any kind connected with the use, or repair of its products. All
warranty returns require pre-approval and Return Authorization.
For Service within the United States:
Wāvtech Customer Service: [phone]
Monday – Friday, 8:30am to 5:00pm MST
Important Notice for International Customers:
For products purchased outside the United States of America or its Territories, please contact your local
distributor concerning specific procedures for your country's warranty policy. International purchases are
not covered by Wāvtech, LLC.
10
Serial Number:
Installation Date:
Place of Purchase:

ITALY
Distributed in the Americas by Wāvtech, LLC
www.stegaudio-usa.com
GT Trading reserves the right to make modifications or improvements without notice thereof. The availability
of the products illustrated is subject to change. The described in this User's Guide represent just a part of the
STEG products available. All brands and trademarks mentioned have been used exclusively for description
purposes and all rights belong to the respective owners, total or partial.
STEG is the Property of GT Trading
©Copyright 2021 Wāvtech, LLC. All Rights Reserved.
1350 W. Melody Ave.
Suite 101
Gilbert, AZ 85233
[phone]