The AmpliVox S1214 Horn Speaker features four horns with car-top mounting assembly. The universal 4 horn speaker module mounts to any vehicle, truck, or boat and easily adjusts for front, side or rear projection. The typical horn speaker is usually made of metal or polymers and can withstand the outside elements better than the cone type speaker, making the horn speaker popular for outdoor PA use. They are far more efficient, you receive more sound volume at a lower wattage, which also reduces both the size and power requirements of your amplifier.