Harman Kardon - SUB-TS11 Subwoofer speaker set

Harman Kardon SUB TS11

The Harman Kardon SUB/TS11 is a powerful, passive subwoofer that was originally shipped as part of various HK cinema systems, such as the popular HKTS 11/set. Because it is a passive model, it has no built-in amplifier and must be connected to a compatible external amplifier or the dedicated subwoofer/output of the accompanying HK receiver. The compact, stylish design with the distinctive silver finish houses a 10-inch driver that delivers deep and impactful bass, which is essential for an immersive film/viewing experience. The solid build quality and its ability to reproduce low frequencies tightly make it a reliable addition to your existing system.

Specifications:
Low/Frequency Driver: 10-inch (250mm) woofer, bass/reflex enclosure
Frequency Response: 35 Hz / 120 Hz (system dependent)
Nominal Impedance: 8 Ohms (typical)

The Harman Kardon works perfectly.
For a better impression see photos