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IMHO using a sub is not very easy. I had a Genelec 2.1 system and it was very hard to find a good position for the sub. If you have the money i would suggest to find monitors that reach enough the low frequencies (depending on your music style); it is by far easier...

Gary

I don't know, if low frequencies are more sensitive to phase issues than other frequencies. That would be theoretically odd to me. Also, try and run a 10KHz sine tone and then move around. To my ears in my room, that is often a real spatial mess.

However, low frequencies often do get noticeably boosted or cut by wall reflections. Adding more subs theoretically only adds so many more reflections (and direct sounds), that it all more or less equals out. I haven't tried it, but I like the idea of it.

On 2006-06-30 06:32, Immanuel wrote:
...However, low frequencies often do get noticeably boosted or cut by wall reflections. ...

exactly that's the source of the phase problems

I decided to buy some 8' monitors (instead of 5' i have now). Also to change apartment to something that i can raise the volume so to hear what is happening without making my neightboors mad...

i also study some acoustics to be able to check the room for bad frequences. I'll do some further check about sub woofers. Thanks for the info guys

Yes Tom
And that would be the reason why it may be a good idea to add so much phase-problems spread out through the frequency band, that it all equals out

long waveforms are easily out of phase. any good live sound engineer knows this. it's the reason not to use multiple bass guitar cabs spread across a stage, but to use them together in one spot. in a room, careful placement could eliminate the problem in the sweetspot where the listener sits. there wiill certainly be holes in the rest of the room.....