Adding subwoofer to Full-Ragne Speakers question

The sub will only help the front speakers at and below the crossover point you set. Most will set it at 60-80hz. You need to know the low cut-off HZ level for the speakers and then see what either the pre-amp/receiver and sub x-over will allow you to set for the cross over. If you have speakers the drop down to e.g. 35Hz and the sub will let you set your X-over point as low as 40hz the try it there for starters. As far as the Mid Range it remainst the same. The speakers never know the sub is playing so they offer no compensation for range. If your reciever/pre-pro let you set the cross over then the front speakers will never see the frequencys below the cross over point as that information is re-routed to the subwoofer.

Well, thanks guy...

Theo says it's not goinig to help at all.

Bomarc basically says it might be marginally helpful but probably not that significant

I don't know how speakers work internally, but basically what I thought was that producing bass is a lot of work for the speakers, and if the subwoofer take some of the hard work away, then there would be more capacity left with the mains to work on other area(namly midrange), thus produce more accurate and rich midrange sound.

I guesss it does not quiet work that way??

No, it does not work really work that way.

I'm no EE, but I'm gotten different answers to this. There are a number of different factors at work.
1. The bass waveform places a significant demand on your amplifier. If you use a powered sub and cut off the low bass with some kind of crossover, then the main amp does not have the same demands placed on it and has more current reserve available.
2. Reproducing low bass can also place a significant demand on the main woofer. If it does not have to go as low, there is a good likelihood that there will be less distortion in the bandwidth it is producing.
3. Most (but not all) full range speakers cannot produce the bass in the lowest octave at the same volume. In other words, they roll-off the lowest frequency. Or another way to look at is "how low can they go". A good subwoofer can usually provide useful, undistorted output down to 20 hz; few "full range" speakers go that low.

I'm sure there are others with more technical know-how, but that's my understanding.