Converting ALAC to .wav


I have my entire music library on two Raid 1 drives connected to my MacMini. The Mac is a 2009 model. I’m considering moving everything to a PC and in .wav format. What is the best way to convert ALAC to .wav?  I may keep the old drives and MM so my preference is to use a new computer and new hard drives, perhaps as an NAS for whole house integration. I want a method that gives me the best SQ. Thank you in advance. 
tgrisham
Or dBpoweramp Music Converter - not freeware. Nice fast batch converting in my experience. Fully functional trial for 3 weeks. 

https://www.dbpoweramp.com/
Thanks!  I was hoping Steve would chime in. Do I transfer all the music over to the new drives first and then convert?  Is there a preferred hard drive?  My DAC is the OPPO Sonica. Is there a preferred method to use Ethernet to go into this DAC which has only USB/Coax/optical and Bluetooth?  Thanks again. 
FLAC, ALAC and WAV are all bit-perfect.

Most modern DACs should be immune to playback via USB.

YMMV, but I'd listen first before deciding to undertake the effort.