Hmm. Typical speakers use multiple drivers to handle different frequencies. For instance, my speakers use a 6.5 inch midrange driver to produce sound from 48 Hz to 4000 Hz, and a tweeter to produce the highs: 4000 Hz to 42000 Hz). Anything lower is handled by the subwoofer.
The speakers contain a circuit board known as a crossover that sends the highs to the tweeter, and the lows to the midrange.
Cheaply made speakers use a single driver, and blurry sound can result. (It is possible to design a good, single driver speaker, but not inexpensively.) Conversely, a well designed multiple driver speaker can fill a room with sound, yet still allow the listener to identify where in space a particular sound is coming from.
It is possible to inflate the Wattage specification of an amplifier by specifying a lower impedence.
For instance, I have a 75 W receiver. That's into 8 ohms. The spec sheet also says that it has a dynamic power output of 160W (3 ohm). It's essentially meaningless. Halve the ohms, double the power (given sufficient current-- which the phillips will most probably not provide.)
IIRC, the Pioneer is a pretty decent receiver. You should be able to find a
set of satellite speakers that won't look too bulky, and would probably improve on your existing system.
(*Those particular speakers have a frequency response of ~130Hz -- 20 kHz and are really intended for use with a matching subwoofer. They contain 3 inch midranges and 1 inch tweeters). Not really my cup of tea, but they don't take up that much space.
