Audio Converter Software

Before you spend any money here's 2 more free ones. Handbrake should be able to do anything you need. Most people think its for video, but it can do audio as well. Its considered one of the better applications if you're looking for good quality. Clementine music player is the other. Its transcoder is very simple to use, but it works surprisingly well.

Both programs work on Mac Windows and Linux.

I've used Trader's Little Helper for many years without any issues to easily convert flac files to wav format. It also supports many other conversions and it's free. When you install it be sure to avoid installation of any optional software which may be included if you don't decline it. http://tlh.easytree.org/

Format factory has worked for me for many years. Free too!

Nowadays most music files are DRM protection, I tried multiple online free video converter, none of them work. The only one works well for me is DRmare Audio Converter which is a commercial software, it works just well. If you don’t care about spending some money, just give it a try.

The experience for me to use Audio Converter Software is to use Apple Music Converter Mac to remove DRM protection and convert Apple music to MP3, AAC, etc at 30x faster speed with lossless quality. We know all purchased or rented Apple music are DRM protected, it can be played on Apple devices only. Now you can use this audio converter software to crack DRM protection and convert audio to multiple compatible formats. It will be much convenient for all users to enjoy Apple audio freely. 

When it comes to Audio Converter software, the best one I like is DRM Audio Converter Mac, which can not only convert protected audio files but also common audio files to MP3, FLAC, WAV, AAC, M4A and M4B at 30X faster speed with zero quality loss while removing DRM protection from Apple Music, Audible books as well as iTunes audiobooks. 
In short, with the help of this smart software, you can listen to any audio file on any device freely. Have fun with my music entertainment with this tool. 

OP, what are the specific sound quality issues you are having with foobar and dbpoweramp?