ProX XS-SP252521W Universal ATA Line Array Speakers Flight CaseProX XS SP252521W Universal ATA Line Array Speakers Flight Case For (2) HDL 28A HDL10A 25x25x21. This Universal Pro Line Array Speaker case is designed to protect your speakers. It features a 3 8" laminated plywood with a hard shell and internal impact resistant padding, ensuring the best protection for your speakers during transit or storage. This universal case fits many brands of speakers, with interior dimensions of 25" L x 25" W x 21" H. This