This document provides a user's guide for the STEG SDSP6 and SDSP8 Competition Amplifiers, which are car audio DSP power amplifiers.
Function Description
The STEG SDSP6 and SDSP8 are car audio DSP (Digital Signal Processor) power amplifiers designed for high-quality audio amplification and digital signal processing. They integrate advanced technology to deliver significant power and sound quality with low distortion and high efficiency. These amplifiers are suitable for competition audio systems, offering comprehensive control over audio signals through their DSP software.
Important Technical Specifications
The SDSP6 and SDSP8 models share many core specifications but differ in channel count and fuse rating.
Power Output (RMS):
- SDSP6: 60W x 6 at 4Ω (14.4V, <1% THD+N), 90W x 6 at 2Ω (14.4V, <1% THD+N)
- SDSP8: 60W x 8 at 4Ω (14.4V, <1% THD+N), 90W x 8 at 2Ω (14.4V, <1% THD+N)
Frequency Response: +0/-3dB, 1W, 4Ω, ranging from 20Hz to 22kHz for both models.
S/N Ratio:
- Spk Out: >74dBA / >92dBA at 1W/rated power, 4Ω for both models.
- RCA Out: >92dBA / >100dBA at 2V/5V for both models.
Distortion (THD+N): <0.07% at 1/2 Rated Power, 4Ω for both models.
Input Impedance:
- High Level: 15Ω for both models.
- AUX: 22KΩ for both models.
Input Sensitivity:
- High Level: 2.5-10V for both models.
- AUX: 0.3-2.5V for both models.
RCA Preouts:
- Max Output voltage: >5Vrms for both models.
- Output Impedance: 450Ω for both models.
Turn-On Trigger:
- Via REM IN: >3.3VDC for both models.
- DC-Offset: >3.2VDC for both models.
Remote Output Current Capacity: >100mA for both models.
Fuse Rating:
- SDSP6: 30A x 1 (End Panel, ATC)
- SDSP8: 25A x 2 (End Panel, ATC)
Current Draw:
- SDSP6: Idle Current 1.2A, Sleep Current 1.6mA
- SDSP8: Idle Current 1.5A, Sleep Current 1.8mA
Operating Voltage: DC Supply 8-16V, <5sec at 6V for both models.
Dimensions (LxWxH):
- SDSP6: 9.8"x8.3"x2.3" (249x210x58mm)
- SDSP8: 11.1"x8.3"x2.3" (283x210x58mm)
DSP Features:
- DSP Resolution: 32-Bit
- Sampling Rate: 48kHz
- Signal Converters: A/D and D/A (Burr-Brown)
- Input Source Select: Via PC or DRC, Main (High Level), AUX, BT, Optical, Coax
- Input Channel Setting: 2ch, 4ch, 6ch, Mix (Mono, 2-way or 3-way sum) for Main (High Level); 2ch for AUX, BT, Optical, Coax.
- 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 for Main (High Level); Null, Left, Right, Left+Right for AUX, BT, Optical, Coax.
- Output Channel Assignments: Front, Rear, Center, Subwoofer (CH7/8 for SDSP8, CH5/6 preouts for SDSP6).
- Output Channel Pre-set Crossover Configurations: Full, Tweeter, Mid-Hi, Midrange, Midbass, Woofer (Front); Full, Tweeter, Woofer (Rear); Full, Tweeter, Woofer (Center); Subwoofer (stereo), Full, Sub Mono (Subwoofer).
- Crossover: Filter Models (Linkwitz, Bessel, Butterworth), Filter Types (Off, HP, BP, LP), Filter Range (20Hz to 20kHz).
- Filter Slope: Linkwitz (-12, -24, -36, -48dB/oct), Bessel (-6, -12, -18, -24, -36, -48dB/oct), Butterworth (-6, -12, -18, -24, -36, -48dB/oct).
- Trim Level (Gain): Main (-40dB to +12dB), Sub (0dB to +12dB), Each Channel (-40dB to 0dB).
- Time Delay: Range (0-25ms, 0-850cm, 0-334in), Increments (0.02ms, 0.71cm, 0.28in).
- Phase: 0° or 180°.
- EQ: 31-band Parametric, Freq (Fc) Range (20Hz to 20kHz), Boost/Cut Range (+/-15dB), Q Range (0.27 to 15).
- Preset Memory: Up to 8 (POS1-POS8).
- Software Interface: Windows PC Required (Windows 8 & 10).
Usage Features
Installation and Wiring:
- Power Supply: Requires a secure connection to the vehicle's main battery (+12V) with an in-line fuse (30A for SDSP6, 50A for SDSP8) within 18 inches (45cm). The ground (GND) terminal must be connected to a clean metal part of the vehicle chassis with a minimum 8AWG wire, no longer than 2ft (60cm).
- Fuse Protection: Built-in ATC fuses protect the amplifier. Always use specified values (30A for SDSP6, two 25A for SDSP8) when replacing.
- Turn-on Modes: Selectable via a switch: ACC ON (for switched +12V via REM IN) or AUTO ON (for DC-offset detection from high-level inputs).
- Input Connections: Supports high-level inputs from the main source, 2-channel low-level AUX, and digital coax.
- Pre-out Connections: Provides 2-channel RCA pre-outs (CH5/6 for SDSP6, CH7/8 for SDSP8) for connecting additional amplifiers.
- High-Level Input Gain Adjustments: Offers 0dB (max) to -6dB (min) attenuation. These are not traditional gains and primarily serve for attenuation or level matching between input channels.
- Bluetooth Port: For connecting an optional Bluetooth dongle (sold separately) as an additional input source.
- Optical Input: For connecting an external optical source (Toslink) cable.
- Speaker Output: Each (+) and (-) wire pair connects to speakers or subwoofers. Observe correct polarity and minimum nominal impedance of 2Ω per channel.
- Remote Control: RJ45 port for connecting the optional DRC digital remote controller (sold separately) for source select, master volume, sub volume, mute, and preset load.
- USB PC Control: USB Type-B port for connecting to a Windows PC to run the DSP tuning software. It is recommended not to use the DRC remote while connected to PC software.
DSP Software & Settings:
- Software Installation: Install the "STEG DSP SETUP" file from the included USB flash drive. Launch the program in "Offline-Mode" initially.
- Initial Setup: Power on the source and DSP unit, turn source unit volume down. Connect the USB cable to the PC and select "CONNECT" from the file menu.
- Real-time Adjustments: All adjustments made in the DSP software are applied in real-time.
- Speaker Configuration: Select pre-set speaker configurations or manually set speaker output types to apply initial crossovers for speaker protection.
- Input Channel Routing: Configure input signal routing (2CH, 4CH, 6CH, MIX) and assign individual input channels to output channels.
- Pink Noise Generator: Available for each output channel for acoustic measurements and tuning with an RTA or audio spectrum analyzer.
- Crossover Settings: Select crossover type (OFF, HP, LP, BP), frequency, filter model (Linkwitz, Bessel, Butterworth), and slope.
- Volume and Trim Levels: Adjust master volume, sub volume (for CH7/8 on SDSP8, or pre-outs on SDSP6 if assigned as sub), and individual channel trim levels.
- Time Delay and Phase: Adjust time delay in milliseconds, centimeters, or inches for imaging. Flip phase (0° or 180°) without affecting delay.
- Parametric EQ: 31-band parametric EQ for each output channel with adjustable boost/cut, frequency, and Q. Visual representation on a graph.
- Preset Management: Save up to 8 presets (POS1-POS8) to memory. Presets can be loaded to override current DSP settings. Master and sub volume are not saved to presets.
Maintenance Features
Safety Precautions:
- Driving Safety: Do not perform functions requiring prolonged attention while driving. Keep volume at moderate levels to hear emergency sounds.
- Vehicle Compatibility: For 12V negative ground vehicles ONLY.
- Wiring and Fusing: Ensure correct wiring connections and use proper fuse protection. Disconnect the negative battery terminal before installation.
- Cable Management: Prevent cables from entangling in surrounding objects or obstructing vehicle controls.
- Drilling: Take precautions to avoid damaging vehicle systems (brake lines, fuel lines, electrical wiring) when drilling holes.
- Mounting: Do not use bolts, nuts, or wires from vehicle safety systems for mounting, power, or ground connections.
- Secure Installation: Install the unit securely using specified parts to prevent it from coming loose.
- Wiring Routing: Route wiring away from sharp edges, moving parts, and protect with loom and grommets. Never run system wiring outside or underneath the vehicle.
- Ventilation: Install in a dry and ventilated location to avoid moisture or heat buildup. Ensure amplifier chassis temperature is safe before touching.
- Initial Tuning: Reduce gain and source volume to minimum levels before connecting signal cables and during initial system tuning.
Troubleshooting:
- Problem Occurrence: Stop use immediately if a problem occurs and return the product to an authorized STEG dealer.
- Professional Installation: Wiring and installation require special technical skill; contact an authorized dealer for professional service.
Warranty & Service:
- Warranty Period: One (1) year from the original date of purchase for manufacturing defects.
- Service in the United States: Contact Wāvtech Customer Service for support.
- International Customers: Contact your local distributor for warranty policy.
Software Updates:
- The DSP software can be updated via the "Update Firmware" option in the file menu.
Backup Settings:
- Periodically save your DSP settings to a preset (POS1-POS8) and save the *.DSP6-8Set setup file to your PC as a backup.
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