I use an XA25 with Dynaudio Heritage Special, which are 4 ohms and 85db. It drives them to very satisfactory levels and I have never felt a lack of power.
I have tried the Dynaudios with my 200 watt Exposure 5010 monoblocks and did not feel that they needed the extra power.
Note that Stereophile measured the XA25 as producing 80 watts into 8 ohms and 130 watts into 4 ohms, so describing the XA25 as 25 watts is a bit misleading.
Obviously, the Martens are different speakers, but Dynaudios are notoriously difficult to drive and the specs suggest that the Martens would be a marginally easier load.