Speakers, floor standing or Bookshelfs

For me, it's large towers preferably, running full range (not crossed over) and a couple of subwoofers.

I'm of the mind, If you like the sound of your speakers why remove part of their character and then try to replace it using the sub?  Running full range you just augment the sound with the sub without taking something away first.

The reason I use subwoofers even with large speakers is because they are able to be placed where they are most effective. I like my speakers pulled way out from the wall to get the best soundstage depth, but this usually decreases bass output.

Adding subs is like adding salt to dish to to enhance the flavour of the food, it changes the whole experience. So using the subs crossover, volume and its positioning you can add the right amount of "salt" to get your system sounding its best.

@newfzx7 

I'm of the mind, If you like the sound of your speakers why remove part of their character and then try to replace it using the sub?  Running full range you just augment the sound with the sub without taking something away first.

While I agree with you that even large floor standers will benefit from subs, there are good reasons to limit them from producing the lowest frequencies.

1. if the woofer does not have to reproduce the lowest frequencies, it will sound cleaner, lower distortion, within the pass band it is reproducing. It will be operating in a more linear area of its range. 

2. If your amplifier does not have to reproduce the lowest frequencies, it will have an easier time reproducing the rest of the spectrum. The vast majority of the power an amplifier produces goes to preproducing bass. Make the amps job easier will result in improved dynamics, and a more effortless sound.

3. I don't believe that taking away the lowest octave will change the character of the speaker. The most audible character of a speaker is in the rest of the frequency spectrum, not the lowest octave of the bass. 

All my opinion, of course. 

@simonmoon 

All valid points you have there. Like everything in this hobby it depends on what sounds best to owner of the system.

I have dabbled with DSP and REW, but in the end with my gear and in my room the best result came without it. I guess we can't really know for sure without experimenting.