A very useful accessory for many Pro-Ject turntables, that do not offer a built-in electronic speed change. The Speed Box S performs this change by the push of a button between 33 and 45 rpm! The quartz regulation and filter circuit gives a far better speed stability for smooth and undisturbed motor operation. Speed Box S is compatible with a lot of Pro-Ject turntables (see list above) and some also offer the possibility to play 78 rpm records with the addition of a special accessory pulley!
A few conditions...
Works only with turntables that use the 16V/AC power supply by Pro-Ject
Also compatible with the Music Hall MMF2.2, MMF5.1, & MMF5.1SE
Models it will NOT work with: RM6.1, Xtension
78rpm is not available for the Xperience, PerspeX, RM9.1 and RM10
6 Moons Review of Pro-Ject Speed Box II ... but if you are like me and crave music, this Pro-Ject system will take you to the Promised Land for far less than you thought possible or necessary to spend.
Positive Feedback Review Well, I didn't expect much from this little box and I was more than a little surprised by the level of improvement it wrought from my system. You get substantially improved sound from your turntable and push button speed change to boot. The motor turning at a slower speed when playing back 33 RPM LPs is said to reduce motor noise though I can't say I heard any to begin with. Though the background did seem quieter and blacker. If I have any complaint it's that the power cord feeding the motor rather short limiting your placement options, especially if your turntable takes up most of your shelf. But for $119, you really can't go wrong. In fact, I would say it's one of the most cost effective improvements you can make to your system. If this little box works with your turntable, and you don't have an electronic speed control already, you are missing what your rig is truly capable of.
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 16 volt AC turntables up to 3 watt max. power consumption
Metal case shields electronics from vibration and electromagnetic interference
Small size allows installation close to record player