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 wyoboy

You may find it useful to download a Real Time Analyzer (RTA) to your phone and check your room for bass modes and nulls--then you will see if your listening position is in a null.  I use AudioTools but there are many others.  You can also use a free room mode calculator called Amroc, but that's more helpful for modes rather than nulls.