Pro-ject speedbox: Is improvement worth the $ ?

Zd542, the project's motor is an ac sychronous and is not dependent on
stable voltage as the speed is determined my the line frequency. As
previously stated, the 60hz US standard is highly regulated and monitored
and does have the same swing variance as does voltage.

The older PS Power Plants had the ability to both regenerate the ac voltage
and change the line frequency, therefore, they could be used as ac motor
controller, but their line frequency adjustment was too course for fine
adjustments. Both the Walker and VPI's SDS are good examples of a
successful implementation of an ac motor controller.

BTW, voltage regulators (good ones like Furman) do provide 120v stable
voltage. You don not need a power regenerator to produce stable voltage.

The Speed Box offers a feature set that would lower the noise floor, improve resolution, and increase dynamic range: The Speed Box sends the AC input through a regulated and shielded component isolated from the turntable chassis. The AC power supply is off-chassis as well. Add in quartz-regulated speed control and that's a lot of functionality for $129.

Of course the soundstage would be deeper and more delineated, and the bass deeper. Those are the kinds of improvements you get when you keep AC artifacts out of the signal chain and thereby lower the noise floor. It's especially critical on turntables, where the cartridge's job is to amplify vibration. Keep the vibrations you don't want off the main chassis. That's what the Speed Box does.

However it does it the SpeedBox IS da'bomb .

Sorry for the late response. I've been away for a few days.
Kiko65, I purchased the Graham Slee Era Gold mkV. I also purchased a Ortofon 2m Blue brand new but haven't received it yet. About a month ago I decided to get into vinyl for the first time. Since then I've been researching tables, cartridges, accessories, etc. I haven't spun one record yet and already I'm getting the upgrade bug. Started with a budget of less than $500. Today I almost bought a used table that retails for $1,600 new. Oh god.

The ExactPower is a waveform correction system. It actively removes high frequency irregularities from the waveform; it does not filter them. The work is accomplished by a high efficiency, pulse width modulated power amplifier.

Will a speedbox be an improvement? Don't know. Only one way to find out...

Yes it is worth the money