Newbie want to improve what I have

"Warm" is a colorization.

Play around with room treatments and with speaker positioning.  Your M33 comes with Dirac room correction. Have you run it?

Do not start throwing money at cables and the like until you have optimized the features in your current system.

Also here is a "guide" for speaker setup.

http://www.cardas.com/room_setup_main.php

Al of of peddlers lurk these pages and will give you a sales pitch, steer clear of those guys.

• built-in Dirac Live room correction with included calibration microphone improves clarity and stereo imaging.

Welcome to the long road to audio nirvana. Take your time, be patient and most importantly change only one thing at a time otherwise you won't know which change did what. Hence the patience requirement. Unfortunately this is NOT a one time purchase endeavor, it will take years and many trials. All worth it, but I am 68 now lol.

Start thinking about your room acoustics, and also Focals sound better with very little toe-in.  If you are pointing the tweeters straight at your head they are probably too bright and the imaging isn't solid from speaker to speaker.

cables and toe in and dirac will not change the overall sound focals are very clean and uncolored so is the nad 

go to your local shop and see whap "warm sounding integeated amplifiers you can borrow and compare