1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your Stetsom IR 400.1 BASS 2 Ohms Digital Sub Amplifier. Please read this manual thoroughly before using the product to ensure proper function and safety.
The Stetsom IR 400.1 BASS is a compact, high-fidelity mono amplifier designed specifically for subwoofers, offering 400 Watts RMS at 2 Ohms. It features advanced technology for defined mids and bass, along with adjustable crossovers and bass boost controls.
Image 1.1: Front view of the Stetsom IR 400.1 BASS Digital Sub Amplifier, showing the "Iron Line" branding, Stetsom logo, model number, and power/speaker terminals.
2. Safety Information
Always observe the following safety precautions to prevent injury or damage to the amplifier and connected components:
- Ensure the vehicle's battery is disconnected before beginning any installation.
- Install the amplifier in a dry, well-ventilated location, away from direct sunlight and heat sources.
- Use appropriate gauge wiring for power, ground, and speaker connections as specified in this manual.
- Do not expose the amplifier to moisture or liquids.
- If the amplifier malfunctions or emits smoke, immediately disconnect power and consult a qualified technician.
- This amplifier is designed for 12V DC automotive systems only.
3. Product Features
The Stetsom IR 400.1 BASS amplifier includes the following key features:
- Power Output: 400 Watts RMS at 14.4V into 2 Ohms.
- Class D Monoblock Design: Dedicated for bass applications, stable at 2 Ohms.
- Audio Controls:
- Crossover (HPF): Adjustable from 5Hz to 35Hz.
- Crossover (LPF): Adjustable from 35Hz to 250Hz.
- Bass Boost: Gain adjustable up to +15dB, frequency range 35Hz to 60Hz.
- Compact Design: New technology allows for a smaller footprint.
- Efficient Cooling: Powerful cooler for improved ventilation and extended use.
- Robust Connectors:
- Power/Ground: 6mm² (approximately 10 AWG).
- Remote: 0.75mm² (approximately 18 AWG).
- Speakers: 2.5mm² (approximately 14 AWG).
- Fuse: 30A.
4. Package Contents
Upon unpacking, verify that the following items are included:
- Stetsom IR 400.1 BASS Digital Sub Amplifier
- User Manual (this document)
Note: Additional accessories such as wiring kits, RCA cables, and subwoofers are sold separately.
5. Setup and Installation
Proper installation is crucial for optimal performance and safety. If you are unsure about any steps, consult a professional car audio installer.
5.1 Mounting Location
Choose a mounting location that is:
- Dry and free from moisture.
- Well-ventilated to allow for heat dissipation.
- Secure, preventing movement during vehicle operation.
- Accessible for wiring and adjustments.
5.2 Wiring Connections
Refer to the installation diagram below for correct wiring. Ensure all connections are secure and properly insulated.
Image 5.1: Top view of the Stetsom IR 400.1 BASS amplifier, highlighting the POWER, REM (remote), GND (ground) terminals, the FUSE 25A slot, and SPEAKER output terminals.
Image 5.2: Rear view of the Stetsom IR 400.1 BASS amplifier, displaying the Bass Boost, Crossover, Input Level controls, RCA inputs, High Input terminals, and an integrated wiring diagram.
- Power Connection (POWER): Connect a 6mm² (approx. 10 AWG) power cable from the vehicle's positive battery terminal to the amplifier's "POWER" terminal. Install a 30A fuse within 30cm (12 inches) of the battery.
- Ground Connection (GND): Connect a 6mm² (approx. 10 AWG) ground cable from the amplifier's "GND" terminal to a clean, unpainted metal point on the vehicle's chassis. Ensure a solid electrical connection.
- Remote Turn-On (REM): Connect a 0.75mm² (approx. 18 AWG) remote wire from your head unit's remote output to the amplifier's "REM" terminal. This turns the amplifier on and off with your head unit.
- Speaker Connection (SPEAKERS): Connect your subwoofer(s) to the "SPEAKERS" terminals using 2.5mm² (approx. 14 AWG) speaker wire. Ensure the total impedance of the connected subwoofers is 2 Ohms or higher. Observe correct polarity (+ to + and - to -).
- Audio Input (INPUT):
- RCA Input: Connect RCA cables from your head unit's subwoofer output to the amplifier's "INPUT L" and "INPUT R" RCA jacks.
- High Input: If your head unit does not have RCA outputs, use the high-level input. Connect the speaker outputs from your head unit to the "HIGH INPUT" terminals (+L/-L and +R/-R).
6. Operating Instructions
Once the amplifier is installed and wired correctly, you can adjust its settings for optimal sound performance.
6.1 Initial Power-Up
After all connections are made, reconnect the vehicle's battery. Turn on your head unit. The amplifier should power on, indicated by an illuminated LED (if present).
6.2 Adjusting Audio Controls
The Stetsom IR 400.1 BASS features several adjustable controls on its rear panel:
- INPUT LEVEL (MIN/MAX): This control matches the amplifier's input sensitivity to the output level of your head unit. Start with the level at minimum, then slowly increase it until you hear distortion, then back off slightly.
- CROSSOVER (L.P.F. 35Hz ~ 250Hz): The Low Pass Filter (LPF) allows frequencies below the set point to pass through to the subwoofer. Adjust this to blend the subwoofer's output seamlessly with your main speakers. A common starting point is 80Hz-100Hz.
- CROSSOVER (H.P.F. 5Hz ~ 35Hz): The High Pass Filter (HPF) allows frequencies above the set point to pass. For subwoofers, this is typically used to filter out extremely low, inaudible frequencies that can waste amplifier power and potentially damage the subwoofer. Set it to the lowest useful frequency, often around 5Hz-10Hz.
- BASS BOOST (FREQ 35Hz ~ 60Hz, GAIN 0dB ~ +15dB): This control allows you to boost specific bass frequencies.
- FREQ: Selects the center frequency for the bass boost.
- GAIN: Adjusts the amount of boost applied to the selected frequency. Use sparingly to avoid distortion and potential damage to your subwoofer.
Recommendation: Make small adjustments and listen carefully to the sound. It is often best to set the gain and crossover points with test tones or familiar music to achieve the desired sound quality.
7. Maintenance
The Stetsom IR 400.1 BASS amplifier requires minimal maintenance. Follow these guidelines to ensure its longevity:
- Keep the amplifier clean and free from dust and debris. Use a soft, dry cloth for cleaning.
- Ensure adequate ventilation around the amplifier. Do not block cooling fins or vents.
- Periodically check all wiring connections for tightness and corrosion. Loose connections can cause performance issues or damage.
- If the fuse blows, replace it only with a fuse of the same type and rating (30A). Using a fuse with a higher rating can lead to severe damage or fire.
8. Troubleshooting
If you experience issues with your amplifier, consult the following troubleshooting guide before seeking professional assistance:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Power / Amplifier does not turn on |
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| No Sound Output |
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| Distorted Sound |
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| Amplifier Overheating |
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9. Specifications
| Feature | Specification |
|---|---|
| Model | IR400.1_BASS |
| RMS Power (14.4V) | 400W RMS @ 2 Ohms |
| Channels | 1 (Monoblock) |
| Minimum Impedance | 2 Ohms |
| Low Pass Filter (LPF) | 35Hz ~ 250Hz |
| High Pass Filter (HPF) | 5Hz ~ 35Hz |
| Bass Boost Gain | 0dB ~ +15dB |
| Bass Boost Frequency | 35Hz ~ 60Hz |
| Input Voltage | 9V ~ 15V DC |
| Fuse Rating | 30A |
| Power/Ground Wire Gauge | 6mm² (approx. 10 AWG) |
| Remote Wire Gauge | 0.75mm² (approx. 18 AWG) |
| Speaker Wire Gauge | 2.5mm² (approx. 14 AWG) |
| Product Dimensions (L x W x H) | 5 x 3.9 x 2 inches |
| Weight | 1.21 Pounds |
10. Warranty and Support
Stetsom products are designed and manufactured to the highest quality standards. For warranty information and technical support, please refer to the warranty card included with your product or visit the official Stetsom website.
For further assistance, you may contact Stetsom customer service through their official channels. Keep your purchase receipt as proof of purchase for warranty claims.
Online Resources:
