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With so many people having home theater systems, they are used to preamps that have a subwoofer out. In a regular stereo amp that has no surround processing, if you see something marked subwoofer out it typically means it is a preamp out. In essence nothing more than voltage signal coming from the preamp, fed to the woofer's amp that is then amplified.

Increasingly people that were into two channel have bought surround systems and find them wanting for pure music enjoyment. If you want to improve performance and get the groove back consider getting a superb integrated and using it as a power amp too. Most integrated amps will function just fine in this manner.

Some Basics:
Every tube used in audio equipment—especially tube amplifiers—has to be set, or biased to the operating point where it can best perform what it’s called to do. Deviations from this operating point generally result in increased distortion and compromised performance. The voltage required to set the tube to this operating point is called "bias" or "bias voltage.” The resulting current through the tube is called "standing current" or sometimes "bias current".

This is where the magic happens... the SuperTubeClock™ replaces the solid state oscillator normally found in a CD player's digital clocking device with a mini triode vacuum tube. By using a tube, we have significantly lowered the amount of jitter and noise, resulting in superior detail retreival. This in turn yields superior detail and dynamics from top to bottom, and improved overrall musicality.

Many manufacturers will toss around remote controlled volume potentiometers made by names like Alps, Noble, and others as a sales tool. You get a remote control for seemingly nothing, and you go home happy. But there is no free lunch and no miracles.