Browse all of our audio conferecing solutionsAdvanced audio conferencing for all your spaces HDL 200For small spaces up to 18′ x 18′ | 5.5 x 5.5 m HDL 300For mid-size spaces up to 25′ x 25′ | 7.6 x 7.6 m Dual HDL 300For large spaces up to 30′ x 50′ | 9.1 x 15.2 m HDL 310For mid-size spaces up to 30′ x 30′ | 9.1 x 9.1 m HDL 410For large spaces up to 35′ x 55′ | 10.7 x 16.8 m