Since the speakers are usually unable to carry the entire range of the program material due to aesthetic considerations (they would be huge!) the subwoofer signal is split out from the audio program by the processor for delivery at line level to the subwoofer. 

Subwoofers need to be placed in the room with the furniture and linings complete before the correct location can truly be established.  A general rule of thumb is to use a minimum of two subwoofers or preferably four.  If two, these would be placed midway along the longest walls, if four subs are used - place them midway along each wall. 

This is a guide only, as mentioned sub placement is dependant on furnishings and room dimensions which dictate room nodes (the zero crossing point of the simple and reflected soundwave at any given frequency). 

If you are sitting in such a node - no matter how loud you make the sub - you will hear very little bass, move your head a meter either side and you will discover all the missing power you have paid for! Complete your room and then place your subs. 

Your home theatre consultant will advise on the best wiring and placement strategy to integrate with the design features of the room.

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