Originally Posted by MikeSp
I read this to mean that if a person is using a tower with built-in sub that reaches down into the low 20Hz range that if there is a separate dedicated sub that the tower speaker should be set to "small," thus cutting off the lower 100 Hz or so of bass -- why not utilize that wonderful bass -- OR why purchase a full range tower if the lower end is going to be cut off -- a good bookshelf speakers would suffice?
Perhaps I misunderstood the idea here?
Either that or your bass management works very differently than mine. I am able to set the speakers to small and the crossover as low as 40Hz. That means that everything above 40Hz is being sent to the speakers, and everything below to the sub (in addition to the LFE signal which only goes to the sub). So there is PLENTY of bass still going to the speakers, and everything from 40 Hz to 80Hz is being played by the built in sub in the speakers.
Despite the fact that Def Tech claims their speakers go down to 20 Hz, I don't think they do that part of the frequency range as well as a good sub, and they roll off quite a bit as well. If you set your speakers to large, than NONE of the bass goes to the sub. Only the LFE channel (effects). So you are "wasting" that part of a good sub.
I spent about an hour last night testing large vs small, and did not change my mind about which sounds best **to me**. There is definitely MORE bass with the speakers set to large, but it is not clean, tight bass, it is boomy and tubby. Now part of that is my sub (Velodyne CHT-12), but I turned it off for part of the experiment, and I still like the sound of the Def Techs better when set to small with the crossover at 40 or 50Hz. I should stress that my tests were done with music, not HT. Despite the fact that I use this system 90% for HT, I want it to sound good for music as well. I find that when it sounds good for music, the HT is also good.
I did find that I liked the sound either way with only the front mains set to large, but in the end, I think small won out.
BTW, "small" is really a misnomer. It should be "activate bass management", and large should be "deactivate bass management". With small, you can adjust the system as you like, with large, you have no control over the crossover (except to manually adjust the levels on the speakers).