If by "more amp" you mean more power or an amp that is more capable of handling the particular load your speakers present, my answer is probably not. I am not familiar with your particular Dynaudio speaker, but, it would be ridiculous for a speaker to demand more power than the Mac delivers, and any speaker that is too difficult a load that that kind of amp would be a horribly defective product.
Now whether or not the Mac sounds good enough with your particular speaker, or any other given speaker, is a different issue. I only heard the 452 with one particular speaker, which is a high efficiency/easyload speaker, and I personally did not like the sound--it sounded lifeless and un-engaging. That is my general impression with most high-powered solid state amps, but, I thought it was particularly the case with the 452 with this speaker.
Now whether or not the Mac sounds good enough with your particular speaker, or any other given speaker, is a different issue. I only heard the 452 with one particular speaker, which is a high efficiency/easyload speaker, and I personally did not like the sound--it sounded lifeless and un-engaging. That is my general impression with most high-powered solid state amps, but, I thought it was particularly the case with the 452 with this speaker.