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Pro-ject Speedbox S Turntable Speed Control

Rear Panel
Rear Panel
Our price: £ 119.00 inc. VAT
Free UK mainland delivery
Shipping UK Mainland Only - No Export

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Key Features

  • Adds Electronic Speed Change Between 33 And 45 r.p.m.
  • 78 r.p.m. Also Possible After Fitting Accessory Pulley

Product Description

Pro-ject Speedbox S Speed Control

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.

The Speed Box S is compatible with many Pro-Ject turntables (see below), and some also offer the possibility to play 78 rpm records with the addition of a special accessory pulley!

Key Features:

  • Electronic speed change between 33 and 45 r.p.m. *
  • 78 r.p.m. also possible after fitting accessory pulley **
  • Replaces the existing 16V power supply on compliant turntables
  • Quartz-generated high precision electronic speed regulation 
  • Creates a cleaner AC mains signal for your turntable
  • Allows the motor to run more efficiently and with less resonance


The Speed Box S will only work with certain Pro-Ject turntable models that have a detachable mains socket and a 16V AC power supply.

It will not work with items that have a captive mains lead, or a DC power supply.

To make your compliant turntable turn at 78RPM, you will need to purchase the additional 78RPM Pulley and a 78RPM stylus.

Below is a list of compliant turntables...

* The following models will NOT work with the Speed Box S:

  • Pro-Ject 1.2E
  • Debut III E
  • Debut II Phono S/B
  • Debut III Phono S/B
  • Debut III USB (more information)
  • Debut Carbon (All Models)
  • Essential Phono USB
  • Essential II
  • Jukebox (All Models)
  • 1 Xpression III Comfort
  • 1 Xpression Carbon
  • Xperience Comfort 
  • RPM 6.1 SB
  • RPM 6.1 SB SuperPack
  • RPM 9.1 SuperPack
  • Xtension (All Models)
  • Signature

** The following models will NOT turn at 78 RPM:

  • Essential (all models)
  • RPM 1 Genie (all models)
  • Debut III E
  • Xperience (all models including Basic+, 2Pack, VPack and Super Pack)
  • 6 Perspex/ Perspex Anniversary
  • RPM 9 (all models including 9.1 and 9.2)
  • RPM 10 (all models, including 10.1 Evolution)
  • Signature


  • 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)

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