Need a preamp?


Hi all, 

I have an older Cary tube preamp and a Bob Latino ST70 with a built in attenuator driving a pair of Proac D30R. The combo seems to be a tad too warm so I tried using the amp without the preamp and it seems to sound better with a wider soundstage and more extended highs. I have a phono amp also so I can also listen to LPs and cds. Is there a reason I need a preamp other than the convenience of switching between the two?  Would a ss preamp or passive preamp add to the sound?  I presume any preamp would only degrade the quality and can't make it better than it is. 


jaferd
Thanks for inputs. Would the Schiit degrade or color the sound more than the Goldpt cause it's so much more affordable. Also, would either give worse sound than just switching the inputs manually and using the attenuator? Just for my own education, do passive preamp color the sound at all and what about cables? Are there any affordable, I mean in the 300 dollar range, used cables I should look for that do not add coloration?  
Would the Schiit degrade or color the sound more
Not if you get the internal passive in your ST70 completely bypassed (not just bridged out).
Then you’ll only be going through one passive, the Schiit Sys.

Cheers George

All great suggestions except remember the volume control in the Schiit Sys is marginal quality at best. Its fine as 2->1 switch box. 
Post removed 
except remember the volume control in the Schiit Sys is marginal


For $49 a screaming bargain, the Shiit Sys has an Alps 10kohm logarithmic mini, not as good as the Alps Blue Velvet or Black Beauty, but better than many around.
Same as this without the PCB cradle
https://images-na.ssl-images-amazon.com/images/I/51sGHNtCW2L.jpg
Cheers George