Pro-Ject Speed Box S - Turntable Electronic Speed Controller

Product no.: BOXS27

can be shipped within 7. days

Price includes VAT, plus delivery
Possible delivery methods: UK Tracked with Signature, Airmail Standard, UK Express, Airmail Tracked with Signature, UK Standard, Heavy Item

Change Your Platter Speed Without Moving the Belt

Upgrade to best possible turntable performance with convenient 33/45 Electronic speed control

The "S" version of the very popular Speed Box motor drive, is more powerful and has higher quality parts for even greater speed stability. No longer tiny, the Speed Box S greatly improves speed stability, which means quieter, blacker backgrounds, excellent bass performance and a smoother, sweeter tonal balance. Highly Recommended for Pro-Ject and Music Hall turntables.

The Pro-Ject Speed Box S is a cost-effective way of providing electronically regulated speed change and stability for many Pro-Ject turntable models. 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.


  • Quartz-generated high precision electronic speed regulation with microprocessor control
  • Sound improvement through motor running smoothness
  • Clean power decoupled from mains interference
  • Allows electronic speed change 33 & 45 rpm
  • 78 rpm possible with optional accessory pulley
  • Suitable for all turntables with 16 volt AC motor, up to 3 watt max. power consumption
  • Metal case shields electronics from vibration and electromagnetic interference
  • Small size allows installation close to turntable
  • Outboard power supply included

A very useful and popular accessory for many Pro-Ject turntables that do not offer a built-in electronic speed changer, the Speed Box S essentially acts as an AC generator for your turntable motor. The use of high-quality materials in the quartz-controlled oscillator and filter circuits means the motor can perform more efficiently and with less resonance than when using the normal power supply, and the Speed Box S does all this while also giving you the convenience of changing speeds at the push of a button.

Connection is simple, as the Speed Box S is supplied with a link cable that plugs into your turntable instead of the normal power supply.

These turntables with 16 volt AC motor are compatible with Speed Box S:  


33/45 (78 with optional pulley):  

Pro-Ject Debut III, Debut Carbon (only US version with 16 volt motor), 1-Anniversary, Art-1, 1-Xpression III & Classic, RPM-5.1  


33/45 (no 78 available, because pulley can not be exchanged):  

Essential, 2-Xperience Acryl & Classic, 6-perspeX, RPM-1.3, RPM-9.1X, RPM-9.2, RPM-10.1  


Caution! Do not use Speed Box S with following turntables:  

Debut III E, Debut II Phono USB, Debut Carbon (all non-US versions), Essential Phono USB, Juke Box (all types), The Classic, 1-Xpression III Comfort, X-tension (all types)  


Nominal Speeds: *33 and 45 RPM / **Optional 78 RPM
Quartz Oscillator: Speed Stability ± 0.001%
Turntable Connection:
16V/190mA AC max.
(3W Power Consumption Max.) 
Outboard PSU: 18V / 500mA DC
Power Cable Length:
(Turntable to Speedbox)
400mm (approx.)
Dimensions (W x H x D):
103 x 36 x 104mm
103 x 36 x 104mm (Incl. Sockets)
Weight: 560g (Without Power Supply)


Pro-Ject  - Box-Design S Line Range of Audiophile Micro Components & Systems



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Pro-Ject Turntables and Phono Products


Pro-Ject Audio Systems is known for its beautiful range of price-friendly turntables. As the largest turntable manufacturer in the world, the company has helped power the resurgence of vinyl, which is predicted to overtake CD in popularity within a few years. Pro-Ject also manufactures a Wide range of Quality hi-fi components.

Pro-Ject products are the result of an exemplary cooperation within a rapidly uniting Europe. For over fifty years record players have been designed and built at Pro-Ject's manufacturing facility in Litovel, situated to the east of Prague. This plant is one of the most advanced manufacturers of precision mechanics in the country In cooperating with this company Pro-Ject Audio Systems, located in Vienna, found the ideal partner for their plans to produce the goods that they missed from amongst the vast flood of consumer hifi products - simple, uncluttered and utterly functional products.

Pro-Ject Audio Systems is currently one of the world's leading suppliers of record players, with a range of models designed to satisfy all levels of expectation and budget. In many countries of the world customers can rely on competent service and support from Pro-Ject distributors well versed in analogue record reproduction technology. Pro-Ject products exhibit sonic performance beyond all expectations normally associated with their price. they are simple to use, maintanance free and will function reliably a lifetime long. They also offer extraordinary value

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* Prices include VAT, plus delivery
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