Originally Posted by christmclean
The amount of power needed for under 20 Hz makes me think I'll need an electrician to get another dedicated 20 amp circuit.
I do like the idea of having four subs. Hoping someone who has gone from 2 to 4 can give me their experience.
Utilizing a multi sub approach, helps lessen the room's incredible dominance down below the Shroeder frequency. The room absolutely owns the bass experience down in the bass range. We're talking below 100-200hz and below, depending on the room size.
I always like to share this image, illustrating how strong the room shapes the response;
As you can see, regardless which sub, from which mfr.,.. was measured, they all were relatively uniform in their FR in the listening position. This is the modal resonances imparting their influence on the final sound. When you properly use a multiple sub/multiple location approach, you take the response back into your hands, lessening the modal issues.
There are differing ways to go about this, multiple subs being one solid approach. The sweet spot in the multi-sub approach is four. Any more, and one doesn't fully realize the modal smoothing benefits that are enjoyed moving from one to two, and up to four. Headroom benefits, yes.
If you've not seen these, you'll get a lot out of them, Part 1
is a good overview. However, Part 2
is even more focused on subs, in a room, acoustics etc.
Those four drivers, in four boxes, in your room, will be superb one everything is blended EQ'd, and time aligned. Remember, it's all about the room, and the integration of the subs to the space. Bass traps will help smooth the response further, and tighten up the note-to-note delineation and clarity. Again, time alignment with your mains, and bass trapping will increase perceived speed, clarity and tight punchy sound. EQ'ing will smooth the sound, allowing all notes to be equally heard as the engineer intended.
If you only have the capability to manipulate two set of two subs, that's fine. You'll still get nearly all the benefits possible with a four sub approach. Headroom wise, you go up 6dB from 1 to 2 subs, and from 2 to 4 again you yield a 6dB gain. So 12dB (this is huge) over a similar 1 sub approach, plus the smoothing.This
, is Toole's paper on bass in listening rooms, good stuff for sure.
Granted, you may have seen those papers, maybe not, hope this helps.