Did you watch the video, specially when he plays for the first time the vocals, I thought the plugin was turned off, sounded so good, I thought why try fixing the vocals, only to realize it was ON with default settings, then David says " are these the defaults? wow". He himself couldn't believe it.
Also the Lindell doesn't have a CROSSOVER knob. Oh it does have it at the bottom.
But, does it have a Width knob?
Would it sound as good as the PSP?
SSL based? I don´t know but it sounds so good on the video (youtube audio sucks anyway, so imagine how good it would sound in real life).