tube pre-amp for active monitors


I have Airpulse Model 1(A200) active monitors currently fed by MacBook Pro > Tidal > Wyred4Sound Re-Clocker > SMSL SU8 > balanced XLR out. I wonder if a tube preamp might yield some gains.... anything not-expensive that might fit the bill? Looking for a bit more enveloping soundstage....
canibefrank