Increasing bass on floor standing speakers


I have some floor standing speakers that were a Visation kit from 30? years ago. 
The treble and mids are amazing but the bass is a little weak. And suggestions on increasing the bass? 
Concrete floor 
Room 3.5 x 11 meters... Speakers on the long wall. 
Rotel ra-01 amp
Project rpm 4 (I think) 
Currently listing to Stevie wonder hotter than july.
Thanks for any suggestions 
speakerboyz

Showing 1 response by wturkey

If the aforementioned suggestions do not yield the results needed, add a subwoofer. I recently ran into a similar issue. Found a little subwoofer at the thrift store and added it. Big improvement. Found a bigger better subwoofer on c.l. for a song. Daisy chained it together and it sounds much better. $60 and a couple sets of interconnects that were boxed up and problem resolved. Good luck!