How high do subs go

Like Duke said: "In my opinion if you're crossing over that high you should have stereo subwoofers, and you should place them symmetrically near the main speakers"

Dave

In the case of the Tact, they actually recommend the opposite, with subs in the corners and satellites out into the room. Of course that's when used with their digital, cross-over and time compensation, etc..

Hi Kal yeah sorry that 80 hz was a typo. I do in fact crossover my woofer system at 185hz. Now the question is what makes someone call a subwoofer a subwoofer? Should I call my sytem a subwoofer, since it goes to 20hz or as I presently call it a woofer system since it is crossed over so high? If your system is capable to 20hz but you are not using what is commononly referred to as a sub ie: 12'-18"+ drivers in a mono or stereo configuration, do you effectivly have a built in sub? What if if you are crossing over (like myself) your low freq speakers at 185hz (or perhaps 150hz, 110hz or 90hz)? What about full range speakers that are cabable to very low freq, but are not using a sub, is it OK to say that we are listening to subs because you have 20hz or so? Or does a subs features mean that it is limited in freq to a low number (and what would that number be?) and must it be seperate? How many full range speakers do not need a sub?
Bob