Not everyone knows this, but the hardware Electra is Kush's best-selling product. I admit, I wasn't expecting that.
This plugin is the first one modeled by me; the biggest challenge was the midrange filters, they're proportional-Q (like the old API's, but tighter) so the bandwidth changes with gain. They're so articulate, I can make drums sound like they were tuned and even mic'd differently.
I know people love brightening things up, and this EQ does that with a buttery smooth precision, but I often use it to reduce highs and make things sound softer, less digital. This is hands-down my favorite bass eq as well, I turn up 40Hz and get a cinematic weight, clear and tightly defined.
Heads up: Electra DSP uses more CPU than a regular EQ. When you hear it, I believe you'll understand why that is.
http://www.thehouseofkush.com/#!plugins/cosa
Want one? - http://oceaniaaudio.bigcartel.com/product/ubk-electra-500-sereis-transient-eq
If you want to listen to the Kush Electra listen to it in the EQ Shootout Player