ProJect Pre BOX S2 as preamp


I have read the reviews of this unit, however have not read much discussion on it's use as a preamp. I would appreciate hearing from those having experience using it as such. Will use it in a second system with different amplifier/speaker combinations of ~$2500 retail price. Thanks in advance for any input.
mesch
looks like a lot of gear for $399--haven't heard, but previously used a project head box and was impressed with the build and sonics, esp. at the price--very uncolored and clean-sounding
Yes, it is a headphone amp, preamp, and DAC, hence my interest. Likely use it with a Dynaco St-70 having 1.34V input sensitivity and a NewForce STA200 having 0.45 input sensitivity. 

ProJect does make a Phono Box which provides maybe 40dB gain such that with many MM cartridges would not reach 1V output.
@yogiboy  
It’s not a phono preamp.  
  
@mesch 
 
https://www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-pro-ject-pre-b... 
 
You can easily use it as a pre-amp. It uses an ESS DAC, so it uses its its own internal 32Bit datapath to do volume control, so no issues.
It’s most likely it will not work. Most phono preamps do not have enough voltage to drive a power amp. You will need to know the output voltage of the Project. I doubt that it is more than 1 volt!