The TC-22/25 Dual Channel Passives by SR Passives are two-channel wired passive volume controls. These are designed for installation in any system where the user needs to adjust the level of an input or output signal. The TC-22/25 have one stereo input and one stereo output, making them suitable for use with any stereo audio source. They feature a low-noise, low-distortion design, with a response frequency range of 20 Hz - 20 kHz. The TC-22/25 uses high-quality components and gold-plated connectors to ensure a reliable, clean performance. The two-channel design allows users to control two separate signals on the same channel, allowing for individual level control of each.