Originally Posted by Newbie01
I am trying to throw back to you guys what I learned in reading this and a few other forums ...and see if I got it "right".
Big bada boom bass...that is the stuff below 20 htz...I think. The lower you go below 20 the more "sub-sonic" feeling you get. For HT 10-12 seems to be the ultimate goal and having suffiencent power at 16 seems to be the realistic goal. (I am just throwing my ignorance out there for all to see...and hope you can edumicake me)
This is all dependent upon the individual. It takes a lot of power and multiple drivers to dig down to 10 hz. There's a difference between 10hz capable, and 10hz capable at reference. .
When you go with two subs...you can bump up the frequency response of your subs without the localization penality so you get better mid-bass and the subs do not become "visable" in your 5.2 or 7.2 system... Duel subs also evens out the bottom end response levels and there is synergy so you two subs gets you 4x the power of one sub...thus it is normally better (all things being equal) to get two good subs rather than one great sub...if HT is your goal (Not sure if this applies to music?)
No. Dual subs has nothing to do with crossover. This can be debatable, but for HT use, an 80hz crossover is recommended. There is no reason to raise the sub xover any higher than this, unless you are running really crappy mains (sats), that won't play down to 80hz. In that case I would recommend upgrading the front stage before adding another sub anyway.
The rule of thumb is doubling of drivers or power nets a 3db increase. You also decrease cone excursion while increasing sensitivity.
The main reason for running multiple subs, notwithstanding the reasoning behind the earlier statement; is to smooth out room response. Multiple subs can smooth out room nodes making for a flat frequency response in more than just one seat. With a single sub I can get a pretty smooth FR in the LP, but move 3 feet over and it goes to hell. This can be combated with multiples, and everyone can enjoy a smooth response.
Then you have something out there like the mid-bass unit of HSU which you place near field and which is designed slightly differnt... So would a Mid Bass unit and a Sub be greater than two subs? If I have to ...for room layout reasons place two subs near field (behind the coach) rather than in front corners...should I go with sealed vs. ported.
Now on to the sealed vs. ported ... I take it that ported gives you deeper extension so the rumbly lows you want for movies is there. It is less "good" for music which requires "tighter" bass and it is preferred to go higher up into the mid-bass range rather than give up the mid-bass for the deep lows of say a HT?
No as well. Ported will give you more SPL right around the port tune, but drops off rapidly after that. There is also no air spring to protect the driver once it unloads, hence why all your ported boxes have a hp built into them to protect the driver from over excursion. A sealed can play much lower, but need more eq'ing to offset the natural roll off down low. A shelf filter works great for them. All things being equal, neither sub will be tighter, more musical, etc. Anyone who tells you that is mistaken. If each is designed properly, they will be indistinguishable from a SQ standpoint.
My budget is about 2k for subs which I think is allot... Since HT is main purpose I understand Sub and Center = 90 percent of my system.
Are you adept at building something, or would you prefer to unbox it, plug it in, and go?