The Schiit Loki EQ didn’t exist 11 years ago when this thread was started, but it does now and it’s an amazing little thing+1 for this, it’s all you need
Here's what it can do, and it's very transparent.
https://www.superbestaudiofriends.org/index.php?threads/schiit-loki-eq-measurements.5153/
Cheers George