Re Gale 401's.. I used to use them with the mid turned fully up and the tweeter backed off a tad..
A Naim 250 will drive 401's with little trouble unless you really want to push it, in which case the rigidly held power supplies will cause the amp to complain rather unpleasantly..
DMS 'briks are fairly efficient and the 250 gives around 125WPC into 4 Ohms (old 'Briks dip to below 3 at some frequencies IIRC). The 401's need POWER to make them come to life and I'd suggest a "looser" sounding amp for them - the Meridian 557 or Quad 606 II/707/909 should be ideal for example, together with other beefy powerhouses.
I can't go on and I can't go back, I don't feel so matter of fact,
I tried and tried to make good sense, What's the good to try it all again?