Samson S-phone Four Channel Headphone Amplifier

1. Introduction

The Samson S-phone is a professional four-channel headphone amplifier designed to provide high-quality audio distribution for multiple listeners. Each channel features independent controls, including volume, two-band equalization, and a stereo auxiliary input, allowing for customized mixes. This manual provides detailed instructions for the proper setup, operation, and maintenance of your S-phone amplifier.

2. Important Safety Information

Please read and understand all safety instructions before operating this device.

• Power Source: Connect the unit only to the specified power supply. Ensure the voltage matches the unit's requirements.
• Ventilation: Do not block any ventilation openings. Ensure adequate airflow around the unit to prevent overheating.
• Water and Moisture: Do not expose this unit to rain or moisture. Do not place objects filled with liquids on the unit.
• Servicing: Do not attempt to service this unit yourself. Refer all servicing to qualified service personnel.
• Cleaning: Clean only with a dry cloth. Do not use liquid cleaners or aerosol cleaners.
• Hearing Protection: Prolonged exposure to high volume levels can cause permanent hearing damage. Use headphones at moderate volume levels.

3. Setup and Connections

Follow these steps to properly set up your Samson S-phone amplifier:

1. Unpacking: Carefully unpack the S-phone and inspect it for any signs of damage. Retain the packaging material for future transport or storage.
2. Placement: Place the S-phone on a stable, flat surface or mount it in a standard 19-inch equipment rack. Ensure proper ventilation.
3. Main Audio Input: Connect your main stereo audio source (e.g., mixer, audio interface) to the MAIN INPUTS (L/R) on the rear panel using balanced TRS or unbalanced TS cables.
4. Auxiliary Inputs: For individual channel mixes, connect auxiliary audio sources to the AUX IN jacks on the front panel for each channel, or the corresponding AUX IN jacks on the rear panel.
5. Headphone Outputs: Connect headphones to the PHONES outputs. Each channel has one front-panel output and two rear-panel outputs, allowing up to three headphones per channel.
6. Link Output: If connecting multiple S-phone units, use the LINK OUTPUT on the rear panel to send the main stereo signal to another S-phone's main input.
7. Power Connection: Connect the supplied AC power cable to the AC IN receptacle on the rear panel and then to a suitable power outlet.

Image: Front panel of the Samson S-phone, illustrating the layout of master and individual channel controls, including volume, EQ, and headphone jacks.

4. Operating Instructions

The S-phone offers comprehensive control over each headphone mix.

4.1. Master Section Controls

• MASTER VOLUME: Adjusts the overall output level of the main stereo input to all channels.
• MASTER LEVEL METERS: 8-segment LED meters display the master stereo input level. Aim for levels that illuminate the green LEDs, avoiding the red "CLIP" LED.
• MONO/STEREO Switch: Toggles the main input between stereo and mono operation. In mono, the left and right signals are summed.

4.2. Individual Channel Controls (Channels 1-4)

• CHANNEL LEVEL METERS: 8-segment LED meters display the output level for each individual channel.
• VOLUME: Controls the output level for the headphones connected to that specific channel.
• BASS: Adjusts the low-frequency content of the channel's output.
• TREBLE: Adjusts the high-frequency content of the channel's output.
• AUX IN: (Front Panel) 1/4-inch input for connecting an auxiliary audio source to be mixed with the main signal for that channel.
• BALANCE: This control has two functions depending on the ST/2CH switch setting:
  • When ST/2CH is set to ST (Stereo): The BALANCE control adjusts the left-to-right balance of the stereo signal.
  • When ST/2CH is set to 2CH (Two Channel/More Me): The BALANCE control adjusts the mix ratio between the main stereo input and the auxiliary input for that channel. Turning it left favors the main input, turning it right favors the auxiliary input. This is often referred to as the "More Me" function, allowing a performer to hear more of their own instrument or vocal.
• ST/2CH Switch: Selects the mode for the BALANCE control, as described above.
• PHONES Outputs: (Front and Rear Panels) Connect headphones to these 1/4-inch stereo outputs.

5. Maintenance

Proper care will ensure the longevity and optimal performance of your S-phone amplifier.

• Cleaning: Use a soft, dry cloth to clean the exterior of the unit. Avoid abrasive cleaners, solvents, or waxes.
• Storage: When not in use for extended periods, store the unit in a cool, dry place, preferably in its original packaging.
• Ventilation: Regularly check that the ventilation openings are clear of dust and debris.
• Cable Connections: Ensure all cables are securely connected and free from damage. Avoid excessive strain on input/output jacks.

6. Troubleshooting

If you encounter issues with your S-phone, refer to the following common problems and solutions:

7. Specifications

Key technical specifications for the Samson S-phone Four Channel Headphone Amplifier:

• Channels: 4 independent stereo channels
• Inputs: 2 x Main Stereo Inputs (1/4" TRS balanced), 4 x Auxiliary Inputs (1/4" TRS unbalanced)
• Outputs: 12 x Headphone Outputs (1/4" TRS stereo - 3 per channel), 1 x Stereo Link Output (1/4" TRS balanced)
• Controls per Channel: Volume, Bass, Treble, Balance (Main/Aux or L/R), ST/2CH switch
• Master Controls: Master Volume, Mono/Stereo switch
• Metering: 8-segment LED meters for Master and each Channel
• Dimensions: Approximately 23.5 x 11 x 4.25 inches (59.7 x 27.9 x 10.8 cm)
• Weight: Approximately 7.34 pounds (3.33 kg)
• Power: AC (specific voltage varies by region)

8. Warranty and Support

Samson Technologies provides a limited warranty for its products. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Samson website. Keep your proof of purchase for warranty claims.

For technical support, service, or replacement parts, please contact Samson customer service. You can find contact information on the official Samson website or through your local distributor.

Online Resources: For additional information, FAQs, and product registration, visit the official Samson website: www.samsontech.com