TRS-1800 The Tensor TRS-1800 has been engineered to deliver unparalleled performance to meet your requirements. The high-grade Class D amplifier combined with the long throw 18 inch HH designed woofer delivers the ultimate in low-end performance. The stereo input and high-pass output connections provide optimal crossover separation between your full-range and sub frequencies: Creating a flawless front-of-house mix. Need more bass? No problem. The shape preset boosts sub harmonic frequencies delivering a deeper bass response. All enclosed in a solid, lightweight enclosure with optimal bass porting.