Pro-Ject Audio Systems
Pro-Ject MC Step Up Box S3
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MC Step Up Box S3
Step-up transformer for MC cartridges
Made In Europe

Sound upgrade for your MC cartridge
The output level of MC cartridges is very low, compared to a MM (Moving Magnet) one it is about 10x lower, which means, you need a special phono amplifier. A higher gain is needed to utilize the signals, which can result in a higher noise level and distortion. The MC Step Up Box S3 is the solution.
We always recommend a step-up transformer in combination with a high quality MM phono (especially tube) preamp, rather than MC phono preamplifiers.

Lively, dynamic & natural
The MC Step Up Box S3 works very differently compared to a phono preamplifier. The windings ratio of the transformer determines the gain factor. As it works completely passive and no external power is needed, no extra power can be produced. The increase in voltage is achieved by a coresponding decrease is current. As there is no amplification, the MC Step Up Box S3 has a remarkable noise performance and a very low level of distortion. The sound with a Step-Up Transformer will be more lively, dynamic and natural.
Gold plated |
Aluminium |
Impedance |
Made in EU |
Premium RCA terminals |
Solid full aluminium housing |
Cartridge impedance setting |
High-quality materials |
REVIEW & AWARDS
Turbo booster for MC sound - Read More

- When the step-up provided the initial amplification, the sounds became more colourful and powerful. Piano music or heavy rock was more authoritative, full and more expressive via the transformer, offering more energy and “seriousness - Matthias Böde
SPECIFICATIONS
Frequency response 10Hz - 55kHz | +/- 1dB |
Gain at 10-40 Ohm | 21dB at 1kHz |
Transformation ratio | 1:16 |
Gain at 40-150 Ohm | 24dB at 1kHz |
Recommended load | 47 kOhm / 100pF |
Input MC | 1x pair RCA phono sockets |
Output | 1x pair RCA phono sockets |
Dimensions WxHxD | 206 x 65 x 153 (164 with sockets) mm |
Weight | 940g |

