A Bass Question


A 20hz wave form takes approximately 27.5 feet to flow out evenly with no time delay. My room is roughly 21 1/2 by 19 with a few cutouts for a walkin closet and a few little offsets. The speakers are along the longer wall.
Given that the room will not completely support the bottom octave, would it be better to have a speaker with less than full range? What is there a formula for figuring what wavelength will most perfectly fit the room?
Would adding subs with a high pass filter accomodate the rest and make things easier overall?
Thanks in advance for your advice and even remarks
Enjoy and happy new year
Ag insider logo xs@2xuru975
Wavelength equals speed of light divided by frequency. Use the same unit of measurement for the wavelength and speed of light in the formula (eg. cm. for wavelength and cm./sec. for the speed of light). Substitute in the room length for the wavelength to find the frequency of the wave that perfectly fits the room.

Just Google "wavelength calculator" for links to online calculators that you can plug numbers into. Let the calculator do the work for you.

I agree with the other posters. The open E string on a electric guitar is only about 36Hz. There isn't too much in the way of music below that unless you listen to pipe organs or big kettle drums. Home theatre effects maybe, but not much music down there. You feel it more than hear it anyway once you get down around 20Hz. I would be more concerned about the lower frequencies only if there are standing waves creating exagerated or null spots in your room.
Markphd thanks for the resource, the perfect lower frequency for my roon is about 32 HZ. Now all I need to do is figure out which speakers go down to around there that I would like to hear.
Larryken, you are indeed correct, rather than add things to the room I would just rather add things to my system and have it happily cohabitate with the room in harmony. Just another way of achieving the same end.
Actually, MarkPhD is correct, except that in air, the speed of sound equals the wavelength times frequency. Also, even though your room will not support even one full 20 Hz wavelength, this is not the only factor in bass. Ever hear a boombox in a car and the low frequencies, not withstanding the hideous bass resonances and distortion? The reason is that subwoofers will pressurize and depressurize the air in the room at low frequencies. I have a JL Audio F113 subwoofer that has a calibration curve that runs from 20 Hz up to 150 Hz. A 20 Hz signal at pants-flapping levels is truly something to be experienced. A good treatise on bass is given at www.rotarywoofer.com. Supposedly this thing will go down close to 0 Hz.
Rlawry, my speakers are producing 0 Hz right now.
Help me out here please. What happens when that 20 Hz is produced? Does it stop coming out of the speaker when the leading edge bumps into the wall?