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The Pro-Ject Speed Box S is an ==outboard electronic speed control and power supply box designed for select Pro-Ject turntables==. It lets you switch between 33 and 45 RPM speeds with the push of a button and uses quartz regulation to improve pitch stability while reducing motor vibration.

Key Features and Benefits

• Electronic Speed Change: Switch from 33 1/3 to 45 RPM instantly without manually moving the drive belt on the motor pulley.

• Quartz Regulation: Uses clean, quartz-generated electronic filtering to stabilize motor rotation, lower motor hum, and improve bass response.

• Metal Casing: Features a solid metal chassis that blocks electromagnetic interference and physical vibrations.

• Optional 78 RPM: Supports playback of 78 RPM shellac records on compatible turntables when using an optional accessory pulley.

Compatibility and Setup

• Turntable Match: Works with many Pro-Ject models that lack built-in electronic speed change (such as older Debut or Expression series), provided they run on a compatible 16V AC motor power setup. Always verify model compatibility before purchase.

• Connection: Replaces your turntable's wall power supply by plugging directly into the turntable's power jack, while the Speed Box's own power adapter plugs into the wall.