Installation Solutions! DELTA Series Speakers . The Delta Series has been designed to provide outstanding performance and reliability. Its robust technology and durable components ensure Delta units meet the demands of touring, rental, and fixed installation applications. High output cast frame woofers with 3” voice coils offer excellent low frequency reproduction. 2” Titanium compression drivers are coupled to 90°x45° elliptical waveguides for impressive output level and smooth HF dispersion. Comprehensive rigging points are provided, .