The line-up now includes Marco Carola, Sven Vath, Solomun and Loco Dice, who are behind Ibiza's four biggest underground parties (Music On, Cocoon, Solomun +1 & Hyte).
Elsewhere, the legendary Sasha will go b2b with Joris Voorn on the Saturday, whilst Andrea Oliva and Andhim have been added to the Saturday line-up, too.
On the Sunday, there will be headline slots from Cocoon’s Sven Väth and Loco Dice, whilst Carl Craig will be performing his Versus Synthesizer Ensemble live show.
There will also be performances from Matthew Dear under his Audion Live moniker, B Traits and Mar-T.
South West Four takes place this August Bank Holiday at London's Clapham Common.
Tickets can be bought here.