1. Product Overview
The TASCAM US-100 is a USB audio interface designed for recording audio into a computer. It features a microphone input, an instrument-level input for guitar or bass, and stereo line inputs that can be switched to RIAA phono level for digitizing vinyl records. The device connects via USB 2.0 and supports recording at CD-quality 48kHz/16-bit resolution. Its compact aluminum construction provides durability.

Figure 1.1: Front view of the TASCAM US-100 USB Audio Interface.
Key Features:
- 2 input, 2 output USB audio interface
- Supports 32 / 44.1 / 48 kHz sampling rates at 16-bit resolution
- XLR or 1/4" microphone input
- Instrument-level input for guitar/bass
- Switchable RIAA phono input for turntables
- Compact and durable aluminum construction
2. Setup
Follow these steps to set up your TASCAM US-100 audio interface.
2.1 Connecting to Your Computer
- Ensure your computer is powered on.
- Connect the USB cable from the US-100's USB port to an available USB 2.0 port on your computer. The device is compatible with Windows operating systems.
- The necessary drivers should install automatically on most Windows systems. If not, refer to the TASCAM website for driver downloads.
2.2 Connecting Audio Devices

Figure 2.1: Rear panel connections of the TASCAM US-100.
- Microphone Input: Connect an XLR microphone to the 3-pin XLR input on the rear panel. Alternatively, a 1/4" microphone can be connected to the adjacent 1/4" input.
- Instrument Input: For guitars or basses, use the 1/4" 'GUITAR IN' jack on the front panel.
- Line/Phono Input: Connect line-level devices (e.g., CD player, mixer) or a turntable to the RCA 'INPUT' jacks on the rear panel. Use the 'MIC/LINE/PHONO' switch on the rear to select the appropriate input type. For turntables, ensure the switch is set to 'PHONO'.
- Output: Connect your monitoring speakers or amplifier to the RCA 'OUTPUT' jacks on the rear panel.
- Headphones: Connect headphones to the 1/4" 'PHONES' jack on the front panel.
3. Operating Instructions
This section details the operation of the TASCAM US-100 controls and indicators.

Figure 3.1: Front panel controls of the TASCAM US-100.
3.1 Front Panel Controls and Indicators
- GUITAR IN: 1/4" input for connecting a guitar or bass.
- SIG Indicator: Illuminates when an input signal is detected.
- OL Indicator: Illuminates when the input signal is overloading (clipping). Reduce the input level if this indicator lights up consistently.
- INPUT Knob: Adjusts the input level for connected microphones, instruments, or line/phono sources.
- BALANCE Knob: Adjusts the balance between the direct input signal and the audio playback from your computer. Turn towards 'INPUT' to hear more of your live input, or towards 'COMPL' (Computer Playback) to hear more of your computer's audio.
- OUTPUT Knob: Adjusts the overall output level to your connected speakers or amplifier.
- PHONES Knob: Adjusts the volume for the headphone output.
- PHONES Jack: 1/4" stereo output for headphones.
3.2 Rear Panel Switch
- MIC/LINE/PHONO Switch: Selects the input type for the RCA input jacks. Set to 'MIC' for microphone, 'LINE' for line-level devices, or 'PHONO' for turntables.
3.3 Software Usage
The TASCAM US-100 is compatible with various digital audio workstation (DAW) software. It includes a copy of Audacity software to facilitate recording and editing. Ensure the US-100 is selected as the input and output device within your chosen software's audio settings.
4. Maintenance
Proper care ensures the longevity and optimal performance of your US-100.
- Cleaning: Use a soft, dry cloth to clean the exterior of the unit. Avoid abrasive cleaners, solvents, or waxes.
- Storage: Store the device in a cool, dry place away from direct sunlight, extreme temperatures, and high humidity.
- Handling: Avoid dropping or subjecting the unit to strong impacts.
5. Troubleshooting
If you encounter issues with your TASCAM US-100, refer to the following common troubleshooting steps.
- No Sound Output:
- Check all cable connections (USB, output to speakers/headphones).
- Ensure the 'OUTPUT' and 'PHONES' knobs are turned up.
- Verify that the US-100 is selected as the default playback device in your computer's sound settings and within your audio software.
- Adjust the 'BALANCE' knob to ensure you are hearing the computer playback.
- No Input Signal / Distorted Input:
- Check input cable connections.
- Ensure the 'INPUT' knob is turned up.
- Verify the 'MIC/LINE/PHONO' switch on the rear panel is set correctly for your input source.
- If the 'OL' indicator is lit, reduce the input level using the 'INPUT' knob or the source device's output level.
- Confirm the US-100 is selected as the recording input device in your computer's sound settings and audio software.
- Device Not Recognized by Computer:
- Try connecting the USB cable to a different USB port on your computer.
- Restart your computer.
- Visit the TASCAM website to download and install the latest drivers for your operating system, if automatic installation failed.
6. Specifications
| Feature | Specification |
|---|---|
| Model Number | US-100 |
| Item Weight | 1.17 pounds (531 g) |
| Product Dimensions | 5.03 x 5.91 x 1.6 inches (12.78 x 15.01 x 4.06 cm) |
| Connectivity Technology | USB 2.0 |
| Number of Channels | 2 Input, 2 Output |
| Supported Sample Rates | 32 / 44.1 / 48 kHz |
| Bit Depth | 16-bit |
| Hardware Interface | USB |
| Compatible Devices | Personal Computer |
| Supported Operating System | Windows |
| Supported Software | Audacity (included) |
7. Warranty and Support
The TASCAM US-100 is covered by a manufacturer's warranty. For specific details regarding warranty terms, duration, and service procedures, please refer to the warranty card included with your product or visit the official TASCAM (Teac) website.
For technical support, driver downloads, and additional resources, please visit the official TASCAM support page. Keep your product's model number (US-100) and serial number (if applicable) ready when contacting support.
8. Official Product Videos
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