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Many subwoofers contain their own amplifier and a crossover filter before it. For these, a low-level preamp output is usually needed; feed it into the subwoofer amplifier's input and also into the main amplifier.
For other subwoofers, which are set up for a speaker level input, just run them in parallel with your main speakers, or combine them into your system with your own bass amplifier and crossover. However, NEVER connect speaker level signals to an input (anywhere on any equipment) which requires a low level (also called a 'line level') signal. You will cause damage, instantly when you turn the amplifier providing the speaker level amplifier on.
In recent years, "Surround Sound" has meant many -- mostly incompatible == things, most embodied in one or more products. Many current mass-fi receivers have "Surround Sound" buttons that do little more than change the imaging in some way.
More recently, "Surround Sound" has become synonymous with the surround decoder systems produced by Dolby Laboratories, DTS, SRS, and others. Dolby Surround is the best known and most widely used; unfortunately for many of us, it comes in several flavors. One is a kind of 'passive surround' (which simply decodes the 'phase' information in a recording and routes it to rear speakers); years a go this technique was often called Hafler decoding. The more complex Dolby system is called Pro Logic. The Pro Logic system uses computer circuitry to route directional information to the appropriate speakers, sually five or more.
The easiest way to change the sound of your speakers is to change where you put them. Ideally, stereo speakers (and the front two speakers in a home theater set up) should be located at ear level, in front of the listening position, and equidistant from that position. It's then a matter of fiddling with:
1. The angles (some speakers are 'beamy' at high frequencies on axis (toe out or in a bit) others should be directly facing the listening position).
2. The distance apart (you ears and brain require some separation, but not too much, so they can integrate the information coming from both speakers).
3. The distance from the listening position (too far away and all you can hear is what is called the reverberant field -- not recommended).
4. The distance from the wall (this affects low frequencies).
