MC Step Up Box S3 - Hi-Fi System PRO-JECT - Free user manual and instructions
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| Product Type | MC Step-Up Transformer |
| Input Connectors | RCA pair (phono) |
| Output Connectors | RCA pair (line level) |
| Gain | 26 dB (at 1 kHz) |
| Input Impedance | 47 kΩ (typical) |
| Load Impedance (cartridge) | 10–100 Ω (recommended) |
| Frequency Response | 20 Hz – 20 kHz (±0.5 dB) |
| Signal-to-Noise Ratio | >80 dB (A-weighted) |
| Channel Separation | >50 dB (at 1 kHz) |
| Dimensions (W x D x H) | 140 x 100 x 30 mm |
| Weight | 0.5 kg |
| Power Supply | Passive (no external power needed) |
| Chassis Material | Aluminum (black brushed) |
| Operating Temperature | 5°C to 35°C |
| Storage Temperature | -20°C to 60°C |
| Humidity | ≤80% (non-condensing) |
| Accessories Included | RCA cables, grounding wire, user manual |
| Maintenance | Wipe with dry cloth; do not use solvents |
| Safety | Keep away from moisture and heat sources |
| Spare Parts & Reparability | Contact authorized dealer or Pro-Ject service |
Frequently Asked Questions - MC Step Up Box S3 PRO-JECT
What is a MC step-up box and why do I need one?
A MC step-up box, like the Pro-Ject MC Step Up Box S3, is a passive transformer that boosts the low output voltage of moving coil (MC) phono cartridges to a level suitable for a standard MM phono preamp. It also matches the impedance for optimal sound quality.
Can I use this step-up box with any MC cartridge?
The MC Step Up Box S3 is designed for most low-output MC cartridges. It provides a gain of 26 dB and a load impedance of 47 kΩ, which works well with cartridges having an internal impedance between 10 and 100 Ω.
How do I connect the step-up box?
Connect your turntable’s MC cartridge to the INPUT RCA jacks of the step-up box using the supplied cables. Then connect the OUTPUT RCA jacks to your phono preamp’s MM input. Also connect the grounding wire from the step-up box to the phono preamp’s ground terminal.
Does the step-up box require power?
No, the MC Step Up Box S3 is a passive device. It uses transformers to boost the signal and does not need any external power supply. This avoids noise from power adapters.
How do I ground the step-up box?
Use the included grounding wire to connect the ground screw on the step-up box to the ground terminal on your phono preamp. This helps reduce hum and noise.
Why is there no sound or very low volume?
Ensure all connections are secure and that the cartridge is correctly wired. Check that your phono preamp is set to MM (moving magnet) input, not MC. The step-up box boosts the signal, but your preamp must have enough gain for MM cartridges (typically 40-45 dB). Also verify that the stylus is clean and the cartridge is properly aligned.
Can I use it with a high-output MC cartridge?
High-output MC cartridges (typically >1 mV) may produce distortion when used with a 26 dB step-up box. It is recommended for low-output cartridges (≤0.5 mV). For high-output MC, a standard MM input is usually sufficient.
What is the frequency response of this step-up box?
The MC Step Up Box S3 has a frequency response of 20 Hz to 20 kHz with a deviation of ±0.5 dB, ensuring accurate reproduction of the audio signal.
How do I clean and maintain the step-up box?
Use a soft, dry cloth to wipe the chassis. Do not use any solvents or abrasive cleaners. Keep the device away from moisture and extreme temperatures. The transformers require no maintenance.
What should I do if the device is not working?
First, check all cables and connections. Ensure the turntable is properly grounded. If problems persist, contact your local Pro-Ject dealer or the manufacturer’s service department. Do not attempt to open the device, as there are no user-serviceable parts inside.
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