Pro-Ject Speed Box S
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Pro-Ject Speed Box S

In stock (1 item available)

The Speed Box S is a costeffective way of providing electronically regulated speed change and stability for many Pro-Ject turntable models (please consult with your dealer regarding model compatibility). A high-precision quartz regulator provides rock steady speed, while the quartz clock generates a clean sine wave voltage, rejecting noise and interference. All functions are microprocessor controlled for accuracy and quick response. A heavy shielded metal case keeps noise and interference to an absolute minimum. The Speed Box S includes a 16-inch detachable connecting cable for interfacing the unit with the turntable.

*Not compatible with newer DC turntables.  Ask dealer for more information.


  • $129.00
  • Weight
    5.0000 lbs
  • SKU


Nominal Speeds
33 / 45 RPM 

Quartz Oscillator
Speed Stability +/- 0,001%

Turntable Connection
16V / AC 190mA max. (3W power consumption max.)

Power Supply
18V / 500mA DC

Dimensions (WHD)
4.1 x 1.4 x 4.2 in., 103 x 36 x 104 mm

1.3 lbs., 560 g without power supply

* In order to replay recordings at 78 rpm, your turntable must be equipped with the 78 rpm pulley which is available as an optional accessory for most turntable models.