Increasing bass on floor standing speakers

The speakers are new to me so I'm not sure if the sound has changed over time. 

Thanks for your reply. 
It's a kitchen and lounge long room with a hallway door at the other end from where I listen. The speakers are set up on the long wall 2.1metres apart starting 1.6m from the corner of the room. I sit opposite them 2.1metres away. 
Yes it's a relative thing... Too much mid and highs for the bass. Just using my ears to assess this and comparison to some tannoy m1 bookshelf speakers. 

Thanks everyone... I've got a few things to try. I noticed that the cable used to wire them was pretty thin so I'll fix this up when I check if they are in phase or not. 

I used a polarity tester and the woofers are on the same phase. The tweeters were giving inconsistent results... One alternated with every pulse, the other was a little more random. I assume I wasn't using the app properly (I played through one phone connected to the amp and received with another. Used different frequencies and the L R fader.)
I'll rewire it with thicker internal wires when I know if I need to change any polarities. 

These look the closest however there is a slit in the bottom at the front. https://impactaudio.co.uk/collections/visaton-loudspeaker-kits-accessories/products/visaton-vib-2000...
I have the ortofon 2m red cartridge (new). 
I also have cd player (nad) and a computer attached. 
I'll try moving the speakers but it's not a practical solution unfortunately and I'll do a test with tilting them. The bass is also light with the cd player.