Greetings!
you can't rush it
There is a really great ear training course that I have started (in my infinite spare time...). It is called
Golden Ears, by Dave Moulton. It is a completely CD-Audio based ear training class designed for audio engineers and musicians. It teaches you how to identify types of effects, delays, etc., including EQ and boosts and their exact frequencies. This class recommends something similar - only listening for short periods of time, and coming back later.
Paul G.
SN# 090000587 (40GB Green)