Horning Eufrodites - help needed with boomy bass

The front left side is the culprit..I thought this was in the back of the room. The wall is deflecting and reinforcing the bass and the cabinet below and the space below that is acting as a storage drum. Wow your room looks great..but consider taking that nich/nook/ storage out and leave the radiator it won't interfere any way. Tom

Tom is right,
I have done much more extensive structural changes in my room in order to tame room bass modes. It is a difficult decision, but by looking at it, shouldn't be that difficult to implement technically- and, you will thank yourself later.
Without some serious re-building you will be "doomed", as far, as the bass goes

Sorry the boards-in-the-port didn't help.

Equalization or a solid state amp are probably your least room-intrusive possibilities at this point. And nothing wrong with room treatment.

Unfortunately I don't have any more inexpensive suggestions.

It is possible that a couple of small, cheap subwoofers, placed one behind each of your speakers and operating out-of-phase, would introduce enough cancellation to smooth things out.

Duke

Must be sleepy time in Paris..

I used to run Zu Definitions 2 spkrs with xoverless full range drivers and 4 x 10" rear firing woofers per spkr, ie many similarities to your Hornings. Always found bass had a tendency to boom and overpower the room. My solution which was c80% effective? Installing a Spatial Computer Black hole anti-bass wave generator. This is in effect a one cubic foot subwoofer sited behind/alongside the listener next to a wall, with integral mic which samples the bass put out by the main spkrs; via dsp, it puts out a cancelling wave of bass, so dealing with standing waves and bass nodes.
Bass hash/boom was much improved, with subsequent improvement in intelligibility, transparency and dynamics.
At $1300 with a full money back guarantee if not happy, you can't go wrong. Clayton Shaw who runs the company is one of the good guys in audio.