The Model Seven High-Pass Filter, a top-of-the-line High Pass Filter, is specifically designed to be inline in front of your amp to roll off frequencies below 100 Hz. which are passed to the Model 7 series speakers and reconstructed in the amplifier powering the bass driver. High Pass Crossover is shown in the Balanced Configuration. The single-ended option is available at a slightly lower price. This product may be available with a discount when purchased together with a matching Vandersteen speaker.