Hello Anton and everyone, yes I forgot to mention the bass! It delivers very realistic bass reproduction down to the lowest stop. It literally shakes the building even at low volumes due to the clearity of sound.
It is an Alesis ProActive 5.1, and I got it from Guitar Center. Here is the web link:
http://www.alesis.com/product.php?id=25
It has 500 watts of power, and here is its subwoofer:
It comes with a certified Dolby decoder, and it will faithfully create a surround signal from a stereo input with one of the decoder's digital effects. Here is the decoder's control panel:
It will accept either direct analog input or digital coax or optical, depending on the connections you can feed it from your computer or sound source.
It is perfect for hauptwerk because I feel it faithfully reproduces sounds from the highest squeak to the lowest rumble. As an experiment I deactivated all sound but the subwoofer, and hit the lowest notes, and you hear just a low rumble and see the windows and doors shake!