Almost certainly. But something you need to check.
Does the phone line still crackle if you plug the phone (no filter) into the Test Socket inside the master socket? Just to prove it isn't your broadband stuff causing the voice crackle. Worth trying with a standard corded phone as well, not a cordless one.
If still a crackle then report a voice fault. BUT!!!! Do not mention broadband at all, and if they ask tell them you have done what I just suggested.
Good luck. And attenuation 46 isn't particularly high. Mine is 51 and I get mid-6000s sync. But that's an excellent quality line even though longish.