Brand NEW! The Dayton Audio H6512 high frequency waveguide is precision molded from durable ABS plastic, and has an industry-standard 1-3/8" x 18 TPI throat for mounting screw-on style drivers. Key Features Uncolored, natural sound Durable ABS plastic construction with threaded throat Standard 1-3/8" x 18 TPI mounting for screw-on drivers Even, consistent coverage pattern Great for PA, stage monitors, or any demanding application The Dayton Audio H6512 high frequency waveguide is precision molded from durable ABS plastic, and has an industry-standard 1-3/8" x 18 TPI throat for mounting screw-on style drivers. Its unique flare geometry exhibits a nominal 90 horizontal x 50 vertical coverage pattern, and will provide useful acoustical loading down to 1,000 Hz. Used in many DIY audio Econowave designs. Specifications: ? Throat diameter: 1" ? Driver mounting: 1-3/8"-18 TPI ? Nominal coverage: 90H x 50 V ? Cutoff frequency: 1,000 Hz ? Dimensions: 6-1/2" H x 12" W x 4-1/4" D ? Cutout dimensions: 5" H x 10-1/2" W. A waveguide couples the high frequency driver to the listening space without the harmful distortion artifacts of marginally designed and implemented horn loading. It achieves this through the use of non-traditional geometries and lower expansion rates. The resultant sound has less distortion, with an "open" characteristic not often associated with typical "pinched" or "honky" compression driver/horn combinations. Dayton Audio professional waveguides reveal all of the articulate, accurate sound reproduction that your HF drivers are capable of delivering, whether the application is live sound, critical studio monitoring, or demanding home audio playback. Product Specifications Construction ABS Entry / Throat Diameter 1" Mounting Type 1-3/8"-18 TPI - All international buyers are responsible for all tax, duties and/or customs fees.