Manufacturer Part Number: RPH16 Affordable durable horns for demanding sound reinforcement applications. Key Features: Excellent low-mid frequency response Weatherproof aluminum construction Stainless steel hardware for long service life For indoor or outdoor applications Standard 1-3/8 -18 threaded throat Dayton Audio RPH16 16 Round PA Horn Pair Affordable durable horns for demanding sound reinforcement applications. The re-entrant style horn flare design provides an expansion path that is longer than conventional straight horns; this ensures that the lowest possible frequency response can be achieved. The Dayton Audio RPH-16 PA horns are formed from lightweight aluminum and painted with a durable polyester finish so you know that they will survive years of exposure to sun and rain. Great for indoor or outdoor applications sturdy mounting yoke for precise alignment included. Standard 1-3/8 -18 threaded throat; 16 mouth diameter. Product Details BrandDayton AudioModelRPH16Part Number300-194UPC844632008023Unit of MeasureEachWeight5.7