Proper preamp for new ATC 40 active floorstanders

Research was unsatisfactory for ferreting out strong preferences of preamps for these ATC active speakers.  I’m considering ATC’s own product.  I’m currently running Manley Neo-Classic 300B.  No need of phono.

Disclosure:  My newly acquired toys are currently with store I purchased them from.  I agreed to let them play with them for two weeks before taking possession.  Thank you in advance for insights.