Suggestions for supplementing your system with a subwoofer can vary depending on the size of the room and the desired size and performance. The dictates of physics dictate that larger subwoofers have an advantage in the performance of very low frequencies, although given some concessions, the results can be satisfactory even with fairly small constructions. The placement of the subwoofer plays perhaps the most important role, both in relation to the walls and the listening position as well as the speakers it will accompany. The photo shows a structure in a cherry finish and a size of about 150lt which was placed to cover a large space.
It consists of a very high-stiffness cabinet, 2 active 12-inch Peerless units on one side and 2 passive ones on the other. The result is very big sound and levels for a given cabinet size, without any loss of control!