1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your Soundstream TXP1.12000D Mono Amplifier. Please read this manual thoroughly before attempting installation or operation to ensure proper use and to prevent damage to the unit or your vehicle's electrical system. Retain this manual for future reference.

Image 1.1: Soundstream TXP1.12000D Mono Amplifier and Remote Bass Control. This image displays the amplifier unit alongside its wired remote bass control knob.
2. Safety Precautions
Always observe the following safety guidelines during installation and operation:
- Disconnect the vehicle's negative battery terminal before any installation work to prevent electrical shorts.
- Ensure all wiring is properly routed and secured to prevent damage from sharp edges or moving parts.
- Use appropriate gauge wiring for power and ground connections as specified in this manual to prevent overheating and potential fire hazards.
- Install the amplifier in a location that allows for adequate ventilation and is protected from moisture and excessive heat.
- Consult a professional car audio installer if you are unsure about any part of the installation process.
- Do not operate the amplifier if it is damaged or malfunctioning.
3. Package Contents
Verify that all items are present in the package:
- Soundstream TXP1.12000D Mono Amplifier
- Remote Bass Control Module
- Remote Bass Control Cable
- Mounting Hardware (screws, Allen wrenches)
- Instruction Manual
- Owner's Registration Card

Image 3.1: Included Accessories. This image shows the instruction manual, owner's registration card, remote bass control, remote cable, mounting screws, and Allen wrenches.
4. Features
The Soundstream TXP1.12000D Mono Amplifier includes the following features:
- 1-ohm Minimum Impedance Monoblock Operation
- LED Accent Lighting Illuminates Circuit Board
- Silicone Steel Alloy Core Power Supply Transformers
- Military Grade SMT PCB for Dynamic Performance
- Direct Short, Thermal, & Overload Protection Circuits
- 200mV-6V High Level or Low-Level RCA Input & Output
- Variable 12dB High Pass, Low Pass, & Subsonic Crossovers
- Dash Mount Gain Control Module Included
5. Installation and Setup
5.1 Mounting Location
Choose a mounting location that provides adequate ventilation for the amplifier's heatsink and protects it from moisture. Avoid mounting in direct sunlight or in areas where it may be exposed to excessive vibration. Ensure sufficient space for wiring connections.
5.2 Wiring Connections
Refer to the diagrams below for proper wiring. Always use high-quality, appropriate gauge wiring.
Power Input

Image 5.1: Power Input Terminals. This image shows the power, ground, and remote input terminals on the amplifier.
- B+ (Power): Connect directly to the positive (+) terminal of the vehicle's battery using a heavy gauge power cable (e.g., 0 or 4 gauge, depending on total system power requirements). Install an appropriate fuse (not included) within 18 inches of the battery.
- GND (Ground): Connect to a clean, unpainted metal surface of the vehicle's chassis. Ensure a solid electrical connection. Use a heavy gauge ground cable of the same size as the power cable, keeping the length as short as possible.
- REM (Remote): Connect to the remote turn-on output of your head unit. This wire turns the amplifier on and off with your car stereo.
Audio Input/Output and Speaker Connections

Image 5.2: Audio and Speaker Connections. This image details the RCA input, RCA output, speaker terminals, and control knobs on the amplifier's rear panel.
- INPUT (RCA): Connect to the RCA pre-out jacks of your head unit.
- OUTPUT (RCA): Provides a full-range signal output for connecting additional amplifiers.
- SPEAKER (+/-): Connect your subwoofer(s) to these terminals. Ensure correct polarity. This amplifier is stable down to 1-ohm impedance.
6. Controls and Operation
The TXP1.12000D amplifier features several controls for fine-tuning your audio system. All adjustments should be made with the audio system off or at a very low volume.

Image 6.1: Amplifier Control Panel. This image highlights the various adjustment knobs for bass boost, frequency, and crossover settings.
- GAIN (Input Level): Adjusts the input sensitivity of the amplifier to match the output of your head unit. Start with the gain at minimum and slowly increase until desired volume is achieved without distortion.
- LOW PASS (Crossover): This control sets the upper frequency limit for the amplifier's output. Typically set between 50Hz and 150Hz for subwoofers.
- HIGH PASS (Crossover): This control sets the lower frequency limit. For subwoofer applications, this is usually not used or set to its lowest point.
- SUBSONIC (Crossover): Filters out extremely low frequencies that are inaudible and can damage subwoofers. Typically set below the port tuning frequency of your subwoofer enclosure.
- BASS BOOST (FREQ/LEVEL):
- FREQ: Selects the center frequency for the bass boost.
- LEVEL: Adjusts the amount of bass boost (0dB to +12dB). Use sparingly to avoid distortion and speaker damage.
- REMOTE (Dash Mount Gain Control): Connects the included remote bass knob for convenient level adjustment from the driver's seat.

Image 6.2: Remote Bass Control Module. This image shows the external knob used to adjust the amplifier's output level.
7. Maintenance
The Soundstream TXP1.12000D amplifier requires minimal maintenance. Keep the unit clean and free of dust. Use a soft, dry cloth for cleaning. Do not use harsh chemicals or solvents. Ensure that the ventilation fins are not obstructed to maintain proper cooling.
8. Troubleshooting
If you experience problems with your amplifier, refer to the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Power / Amplifier Not Turning On |
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| No Sound Output |
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| Distorted Sound |
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| Amplifier Overheating / Protection Mode |
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9. Specifications
Technical specifications for the Soundstream TXP1.12000D Mono Amplifier:
| Feature | Specification |
|---|---|
| Model Number | TXP1.12000D |
| Manufacturer | Soundstream |
| Minimum Impedance | 1 Ohm (Monoblock Operation) |
| Voltage | 16 Volts (DC) |
| Maximum Supply Voltage | 6 Volts (This specification from the source data is unusual for a car amplifier's main supply; typically, car amplifiers operate on 12-14.4V. Please refer to the product's official documentation for clarification if this value seems incorrect.) |
| Mounting Type | Surface Mount |
| Input Sensitivity | 200mV-6V (High Level or Low-Level RCA) |
| Crossover Type | Variable 12dB High Pass, Low Pass, & Subsonic |
| Bass Boost | Variable (0dB to +12dB) |
10. Warranty Information
Soundstream Technologies provides a limited warranty for this product. Please refer to the Owner's Registration Card included in your package for specific terms and conditions. Generally, the warranty covers defects in materials and workmanship under normal use for a specified period from the date of purchase. Keep your proof of purchase for warranty claims.
Note: The warranty may be voided if the product is improperly installed, abused, or modified. Professional installation is recommended.
11. Support and Contact
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact your authorized Soundstream dealer or visit the official Soundstream website for support resources.
Website: www.soundstream.com (Example link, actual link may vary)