Pro-Ject Phono Box S2 Ultra Phono Preamplifier User Manual

1. Introduction

The Pro-Ject Phono Box S2 Ultra is a high-performance phono preamplifier designed to enhance the audio quality from your turntable. It features a discrete circuit design without operational amplifiers (OpAmps) and utilizes audiophile-grade polystyrene capacitors for precise RIAA equalization. Its robust metal casing provides effective protection against electromagnetic interferences, ensuring a clean and detailed sound reproduction.

This manual provides essential information for setting up, operating, and maintaining your Phono Box S2 Ultra, ensuring optimal performance and longevity.

Figure 1: Front view of the Pro-Ject Phono Box S2 Ultra. This image displays the sleek, silver-colored metal chassis with a single power button on the left and the "Phono Box S2 Ultra" text along with the Pro-Ject logo on the right.

2. Setup and Connections

Before connecting your Phono Box S2 Ultra, ensure all audio equipment is powered off. Carefully unpack the unit and verify all components are present.

2.1. Unpacking and Contents

Your package should contain the Phono Box S2 Ultra unit and its external 18V DC power supply.

2.2. Connecting Your Turntable

Connect the RCA output cables from your turntable to the "In" RCA jacks on the rear of the Phono Box S2 Ultra. Ensure the left and right channels are correctly matched (typically red for right, white/black for left). If your turntable has a ground wire, connect it to the ground terminal located next to the input jacks.

2.3. Connecting to Your Amplifier/Receiver

Connect the "Out" RCA jacks of the Phono Box S2 Ultra to a line-level input on your amplifier or receiver (e.g., "Aux", "CD", "Line In"). Do not connect it to a "Phono" input on your amplifier, as this would result in double equalization and distorted sound.

2.4. Power Connection

Connect the external 18V DC power supply to the "18V" input jack on the rear of the Phono Box S2 Ultra. Then, plug the power supply into a suitable AC outlet.

Figure 2: Rear connections of the Phono Box S2 Ultra. This image highlights the "In" (input) and "Out" (output) RCA connectors for left and right channels, the ground screw, the small black button for the subsonic filter, and the 18V DC power input jack.

2.5. Initial Configuration (Dip Switches)

The Phono Box S2 Ultra features dip switches on its underside for adjusting input impedance, capacitance, and gain. These settings should be matched to your phono cartridge's specifications for optimal sound. Refer to your cartridge's manual for recommended settings. A small tool (e.g., a toothpick or small screwdriver) may be needed to adjust these switches.

• Gain: Adjusts the output level to match your amplifier's input sensitivity and cartridge output. Four adjustable gain levels are available.
• Input Impedance/Capacitance: Crucial for matching Moving Magnet (MM) and Moving Coil (MC) cartridges. Incorrect settings can lead to frequency response anomalies.
• Subsonic Filter: A switchable -18 dB @ 20Hz filter is located on the rear panel (see Figure 2). This filter helps to remove very low-frequency rumble and warp-induced signals that can cause speaker cone excursion without contributing to audible music.

It is recommended to experiment with these settings to find the best sound for your specific setup and listening preferences.

3. Operation

Once all connections are secure and dip switches are set, you can begin using your Phono Box S2 Ultra.

3.1. Powering On/Off

Press the power button on the front panel (refer to Figure 1) to turn the unit on or off. A small LED indicator next to the button will illuminate when the unit is powered on.

3.2. Listening to Records

With the Phono Box S2 Ultra powered on and your amplifier set to the correct input, you can now play records on your turntable. Adjust the volume on your amplifier as usual.

Figure 3: The Phono Box S2 Ultra integrated into an audio system. This image shows the compact preamplifier positioned next to a turntable, demonstrating its small footprint and how it fits into a typical vinyl playback setup.

4. Maintenance

Proper care will ensure the longevity and performance of your Phono Box S2 Ultra.

• Cleaning: Disconnect the unit from power before cleaning. Use a soft, dry, lint-free cloth to wipe the exterior. Avoid using liquid cleaners, aerosols, or abrasive materials.
• Placement: Place the unit on a stable, level surface away from direct sunlight, heat sources, and excessive moisture. Ensure adequate ventilation around the unit.
• Storage: If storing the unit for an extended period, disconnect it from power and store it in a cool, dry place, preferably in its original packaging.

5. Troubleshooting

If you encounter issues with your Phono Box S2 Ultra, consult the following table for common problems and solutions.

6. Specifications

The following are key technical specifications for the Pro-Ject Phono Box S2 Ultra:

• Model: Phono Box S2 Ultra
• Input/Output: 1 pair RCA connectors
• Channels: 2
• Voltage: 18 Volts (DC)
• Material: Metal casing
• Features: Switchable input impedance/capacitance, Four adjustable gain levels, Switchable Subsonic filter –18 dB @ 20Hz, Audiophile-grade polystyrene capacitors, No Operational Amplifiers (OpAmps) used.
• Weight: Approximately 1.52 pounds (0.69 kg)
• Compliance: CE, FCC
• Manufacturer: Pro-Ject

Note: Product dimensions provided in source data (0.39 x 0.39 x 0.39 inches) appear to be incorrect. The unit features a compact, surface-mount design.

7. Warranty and Support

For detailed warranty information, please refer to the warranty card included with your product or visit the official Pro-Ject Audio Systems website. Warranty terms and conditions may vary by region.

Should you require technical assistance or support, please contact your authorized Pro-Ject dealer or the Pro-Ject customer service department. Contact information can typically be found on the manufacturer's website or in the product packaging.

For more information, visit the Pro-Ject Store on Amazon.