I have atcsm40 want possible alternative


I have the atc sm40's. My only complaint is they seem to  have to be played really loud for them to sound great. They are being pushed with hegel h590.     blusesound vault running through a mytek brooklyn plus              Thanks for any input
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Has anyone with older ATCs gotten the tweeter upgraded and found that the new tweeters improve low volume performance?  I've got a fairly recent pair, around 2012, but they still have the old tweeter.  They sound great when you crank them up a little but at low volumes do sound fairly dull.
Try Legacy Audio Focus SE. They play great at lower volumes and are easy to drive. There is a pair on here for sale.