SUB T-36.39

The TIW 360 X 8 OHM is well suited as a subwoofer in home theatre systems or as part of a hi-fi application, due to its heavy-duty diaphragm and low resonance frequency. In this sample arrangement, it is used in an enclosed chamber with a net capacity of 39 litres.

The passive arrangement will produce powerful, low-range bass, such as would normally only be possible with other drivers in far larger cabinets. If you add an 820 µF-capacitor before the TIW 360 X 8 OHM, the output level below 50 Hz will be raised and above this level it will be lowered. This lowers the lower limiting frequency to a remarkable 28 Hz. As a matter of interest, at 1 watt it is virtually impossible to measure a difference between the normal, coarse (very cheap) electrolytic capacitorsand the smooth, high-grade ones. Film capacitors are definitely not required. At higher output levels, however the coarse electrolytic capacitors could heat up. Which electrolytic capacitors you use is really not so much a matter of sound quality, but rather one of operating safety. The precise specifications are less important. It would be possible, for example, to install another 1x 470 µF and 1x 330 µF or 8x100 µF (in parallel) instead of a 1x 820 µF.

Things really hot up, however, if you decide to use amplified speakers with an active crossover. We used the Thommessen Proteus SW 2.5, which provides a large number of setting options. The signal level is equalized below the installation resonance frequency in such a way that you get a good bandpass curve (bass EQ +6 dB at 23 Hz, low pass 50 Hz). The lower limiting frequency will then be at a breathtaking 20 Hz. Of course, since every room has its own acoustic properties, you should select the option that provides the best actual listening pleasure.

Variants: 1) passive
2) passive with an 820 µF capacitor
3) active with a Proteus SW 2.5 (without capacitor)