Andrezpjw - the FPS1800s aren't bad computer speakers, but you are comparing them with audiphile equipment. It is that simple.
Bah. While you guys know a lot about headphones, ya don't know much about computer speakers.
The FPS1000s were the first 4 point setup in a box, and they are basically the same thing as the PCWorks (Which I own a set of) with 4 sats and a slightly more powerful amp. A year before the FPS1000s came out I had a hack-job setup with a pair of Altec Lansing ACS-48s for fronts, and the Microwors for rears. The Altec 48s are one of my favorite computer speaker. Much warmer sounding then the Klipsches and CSW speakers, they were easier to listen to, althought they were poor at low volume, and the mids got somewhat muddled at louder volumes.
I don't know about the Monsoons you mentioned, but the Monsoons I have heard have the best imaging for PC speakers, and have a very neutral sound. As a general rule of thumb, they are very lean on the bass side. (And midbass too)
CSW makes some decent computer speakers, but they aren't anything amazing that blows away other stuff in their class. The Microworks are excellent speakers, but I think the Monsoons are going to be more accurate. BA makes similar sized/styled speakers to CSW, and BA's sound better. The sub usually isn't as overdriven as the CSW ones. The PCworks/FPS1000 sub is a little 4" speaker in a tiny platic enclosure. The crossover is like 200-220Hz, the sattelites are incredibly tinny sounding without the sub playing. If anything, they sound more like Bose then Monsoon or BA.
The new Megaworks set looks like it will be much more competitive then their older higher end models, which looked like they reused the sattelites from the CSW Soundworks, which were IMO very nice speakers.
Altec Lasning's best speakers I have heard were the ACS-48s. The new ones aren't as good, although one of their newer sets comes close. The Altecs that look like the ACS-33s sound like crap, and some of their other new designs sound like crap too, also.
As a general rule of thumb, from forwardness to laidbackness for computer speakers of major brands, Altecs are in general by far the most laid back sounding, but some like the ATP3 go away from that trend:
Altec (Some new models)
CSW (Higher end)
My PCWorks are very forward sounding, this is more because the sats can't do lower mids even, and the sub is so badly overdriven it is a joke, so you have to have the sub down very low to get a decent sound in dynamic music. It gets boomy way too quickly.
Monsoon subs more closely resemble CSW subs in sound - being somewhat overdriven/underpowered compared to the BA and Altec ones, and badly overdriven compared to the Klipsch ones.
Klipsches sound forward, harsh, and boomy as a general rule of thumb.
CSW speakers vary more - the cheap ones sound forward, peaky subs that are underpowered.
Altec-Lansings generally have a warmer sound, with more oomph, but many of their models have a nasty hollow sound.
Monsoons sound the most neutral to me, leaning somewhat towards a forward sound because lower mids could be more prominent and in most of the systems the sub is just an afterthought.
BA speakers are the most accurate sounding cheap speakers to me, and the subs aren't much better off then the CSW speakers.
Again, this is just a general rule of thumb kind of thing, Altec Lansing makes speakers that have all different kinds of sounds, but more of them are laid back then forward. Klipsch, on the other hand, has a consistent sound from model to model. Monsoon does to an extent, and BA does too.
Did I mention I hate those speakers with the new "microdrivers" like the soundsticks JBL makes for Apple and the newer Altec Lansing ones? Those 1" speakers have amazing excursion capabilites, and I wonder if they will pop out or something