Pyramid TW28 3.75-Inch Aluminum Bullet Horn In Enclosure with Swivel Housing by Sound Around. $21.69. Pyramid Car Audio prides itself as being the most affordable solution to car audio. The founders of Pyramid over two and a half decades ago developed a notion of how to bring affordable audio products to the US market. With this constant vision in mind, it took only a few short years before Pyramid was considered the worldwide leader of affordable audio product...