Originally Posted by Yukichon
I am not versed I the dark arts of sub bass waves, control, dips, peaks or any of that jazz, so that is why the inuke route scares me....
Here is an illustration that might be of use.
Lightwaves and soundwaves have several similarities:
1) They both have a fixed speed (more or less)
2) How high or deep the sound is, is measured in Hz (Hertz named after the scientist, and is actually: waves per second or cycles per second)
The word Hz or Frequency is pretty much inter-changeable in meaning.
Low bass can be larger than a house and can travel for miles in every direction with seemingly unstoppable force.
You've probably heard a bass-car zoom by at least once in your life, it shakes everything and your walls/doors/windows don't stop it by very much.
Humans can hear between 20 to 20,000hz.
Bass is basically anything below 200hz. (0Hz to 200hz)
As the Hz decreases the wave size gets bigger and the "note" is deeper sounding.
Loudness is measured in decibels, or db's
Keys on a Piano have a particular Hz as represented. They also have Music Note symbols and are arranged in Octaves.
As you can see a piano covers from 27.5hz (low) to 4186hz (high).
An Octave is a Halving or Doubling of the Hz.
So one Octave above 30hz is 60hz, one below is 15Hz.
Here is a youtube video of a bass frequency sweep, skipping in 5hz increments, to give you an idea of what that sounds like.
A room-mode is basically where the size of the wave matches the size of the room. Floor to Ceiling, Front to Back or Side to Side. Usually people have 3 primary room-modes.
Since peoples rooms aren't perfect cubes or Spheres, the distances between walls will vary and the Frequency/Hz of the bass wave that fits between them with also vary by the same amount.
The speed of sound is 1125 feet per second or 343 meters per second (it actually varies by altitude and temperature but lets not go there).
So for a room that is 20ft wide, that room mode will be 1125fps / 20ft = 56.25hz.
The half-wave and quater-wave modes will be at 1125 / 20 * 2 = 112.5hz and 1125 / 20 * 4 = 225hz
Bass at these frequencies will sound quieter or louder depending on if you are located at the peak or dip of the waveform.
You can visit this website and type in the size of your room and hit go, and it will do all the math for you.
Sound will travel 20ft in 0.018 seconds (20ft / 1125fps), in case you are wondering, (1 / 56.25hz gives the same number).
There will be 56 peaks and dips within that 20ft span. Yikes! You can see how that is a problem for higher bass notes.
If you play a constant bass note from your sub, say 100hz and walk around the room, you will probably notice some variations in the loudness (or db's).
This is bad if it lands directly on the theater seats, unfortunately it is also unavoidable, EQ/DSP systems can only "help to a degree" to smooth it out, it won't be perfectly flat unless you are playing bass in a wide open field where it can only reflect once off the ground. But without EQ it can often sound horrid, especially if you have less than 4 subs.
As you add 1 sub near each corner of the room the peaks and dips tend to smooth out to a degree, much better than just 1 sub.
and that concludes Lesson #1 for today.
For more information, you'll want to download Room EQ Wizard (REW) and read as many AVS and google articles about it as you can; as they cover basically everything you'd need to know.
Don't buy any gear for it, just read and learn.
You'll also want to download and install the iNukeDSP software and user manual.
You don't need the amp to play around with its screens.
I'd recommend you read the user manual in it's entirety firstly: