Pro-Ject turntables sound great out of the box, but the Speed Box II offers an affordable and effective upgrade if you're looking to get a little more from your deck. First off, it allows you to switch between speeds with the push of a button, but most importantly, it reduces the speed variance of the record platter. This amounts to much more controlled and natural bass, heightened clarity through the mids , and tighter highs. The Pro-Ject Debut, Xpression, and RM5-SE all benefit tremendously from this upgrade.

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

Pro-Ject Speed Box II Brochure

Pro-Ject Speed Box II User Manual


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. Adam Goldfine

Pro-Ject Speed Box II Features

Metal case shields the electronics from vibrational and electromagnetic interference

Electronic speed change between 33 and 45 r.p.m., 78 r.p.m. also possible after fitting accessory pulley

Quartz-generated high precision electronic speed regulation

All functions microprocessor controlled

Outboard power supply included

Pro-Ject Speed Box II Technical Data

Nominal speeds * 33,33 and 45,11 U/Min. ** Optional 78 U/Min

Quartz oscillator Speed stability ± 0,01%

Power supply 16V/500mA AC

Dimension W x D x H 80 x 85 x 20mm

Weight 300g without power supply

click image to enlarge