Dutch PA system manufacturer Sound Projects revealed that AED, one of Europe's largest dry hire rental companies, has ordered a further 64 of its SP-4 systems to add to the 100+ it already owns. Described by AED's Glenn Roggemans as "a hybrid form between ground stack and line array", the SP4 systems are, he says, in a world where most sound reinforcement is ground-stacked "one of our most rewarding investments in the last 10 years."