Originally Posted by HomeTheaterGuy74
I am looking for some great sounding multi-channel speakers for music only...
I have been told that speakers with built-in subwoofers are not as good as having the same speaker and the subwoofer seperate - is this true
No, as a generalization, it's false. There may be instances
where it is true, but that is due to poor individual design, rather than the format itself.
There is growing evidence that we can localize LF lower than previously believed: http://www.acoustics.asn.au/conference_proceedings/AAS2008/papers/p47.pdf
So while for HT, with it's crash bang explosions, etc., it may be moot, for music
it may not. Then there is the issue of being able to highpass frequencies from your mid (depending on speaker design) that would lower excursion and thus non-linearities (manifesting as distortions) produced.
By having the subwoofer spatially in the same location, you can run it higher (without spatially separated localization problems) and thus hi-pass the mid higher and reduce excursion.
Lastly, unless you are extremely lucky, 2 LF sources will be insufficient for very smooth bass, even for a single listener position (you, listening to MCH music), because whereas EQ can be used to remove all peaks in the response at that position, it cannot correct for nulls. That can be done with additional spatially distributed LF sources (as few as one). So by having built in subs, you already have 2 distributed sources in the room (L&R), making it easier to add one or more (subs) to smooth the response and fill any nulls.
And yes, I practice what I preach.