I found this Ear training App called Auricula. It's the best 69p I've ever spent.
It's a Iphone App that tests you on EQ, stereo image, delay settings and gain changes.
I've been using it for EQ, what it does is plays a sound source such as a track from your Itunes library, or a built in pink noise, kick or snare sample and then boosts random frequencies and you have to select the correct answer to score.
You can even change the boost and Q amounts to make it harder.
I connected my IPhone to my Studio Monitors. My best score so far is 81/100 after some practice LOL.
Its good to try on other systems to.
It tests you on 33Hz, 63Hz, 125Hz, 250Hz, 500Hz, 1k, 2k, 4k, 8k, and 16k.
Hope it helps someone.

Cheers
Steve.