Hi Mickael. A tough question at any time, can XX watts amp drive Y speakers. So many variables and can the amp drive the speakers is one question, but is it a good musical match I think is just as important.
i cannot answer your question directly but this review of the Response 3s might provide some clues.
i think you have to ask yourself what you are missing now. Is the sound too clinical, too bright, too dull, too bottom heavy, etc. What are the differences from now and then. I see the Response 3s are designed to be mass loaded in a bottom cavity in the speaker, and how that is done will greatly affect the sound.
i use an Air Tight tube amp at 36wpc to drive my Proac Response D Twos with no issue, plays louder (and crystal clear) than I care to listen and this is in a large 30 foot by 15 foot room with 9 foot ceilings.
The Response D Two have a 88.5db sensitivity, almost the same as the 3s. Of course not all watts are equal. My 150wpc NAD C375BEE could not drive my Proacs to the same levels as my Air Tight 36wpc, and the NAD does not even come close to the sound quality of my tube amp. Here is the Stereophile review with discussion on mass loading the 3s. A very good place to start if the speakers are not loaded. Without the right foundation no speaker can perform to its best.
https://www.stereophile.com/floorloudspeakers/991proac/index.html
Paul
Pauls Stuff
Amp and Pre — Air Tight ATM1-S tube amp 36wpc EL34, Linn Akurate Kontrol 2 channel preamp
Speakers and Analog - Proac Response D Two, Thorens TD160HD with Clearaudio Talismann V2 cart, Clearaudio Basic+ with Accu+ phono preamp
Digital — Auralic Aries streamer, Cambridge Audio 840C CD
Rack Isolation - Solid Tech Radius Solo, HRS, Symposium, and Synergisitc Research isolation shelfs.
Power treatment/cables — Audience AR6TS power conditioner, interconnects and power cables mix of Cardas Golden Reference and Nordost Valhalla.