Solution: I took the circle cut out of the hole and cut another circle in that. I had a wood ring and glued it snugly to provide a good air seal. This let the screws catch on the wood rim and the subwoofer sounded much better and louder.
Saturday, May 18, 2013
16 May 2013
ERROR! I acquired an amplifier and drilled the main hole in the subwoofer box. I drilled a hole 12 inches because I did not have a measuring tape to measure the circumference of the air seal in the subwoofer. The hole was to large and when I placed screws in to secure the subwoofer head, several did not catch on the wood and they stripped. The subwoofer shook and rattled a bit because the air was not sealed and escaped out of the gap.
Solution: I took the circle cut out of the hole and cut another circle in that. I had a wood ring and glued it snugly to provide a good air seal. This let the screws catch on the wood rim and the subwoofer sounded much better and louder.
Solution: I took the circle cut out of the hole and cut another circle in that. I had a wood ring and glued it snugly to provide a good air seal. This let the screws catch on the wood rim and the subwoofer sounded much better and louder.
Friday, May 17, 2013
Final Video test May 17, 2013
http://www.youtube.com/watch?v=v1RsQZGdrZM&edit=vd(will update once the video goes live on youtube)
17 May 2013 Review Specifications.
Box size
-This box contains 1.01 Cubic feet of air space needed for proper acoustic sound.
-18"width x 14"height x (12"x8")/2"+8" length -the space the subwoofer takes up.
Power Input
-120Watt DC power outlet (do not have inverter for car). this is converted into 600watts through the amplifier.
Ohm Rating
-the amplifier is rated at 4 ohms and the subwoofer head is rated at 4 ohms but wired on each end to support 2 ohms on each wire connector to balance the voltage. (4x2 or 2x4 ohms are recommended)
Decibal increments increased.
-This is very difficult to get the exact figure but in a diagram, the sound is imputed from a music player, through a headphone amplifier, to the main amplifier unit which draws power from a DC plug which is then inputted into the subwoofer unit and projected as sound. The bass is such a low frequency but this is calculated to anywhere from 80 to 120 decibals.
Monday, May 6, 2013
3 May, 2013
I did some work outside of class and successfully had a few things completed.
I spoke with a audio-engineer in a local business in downtown Holland and found important information regarding the layout of this subwoofer box. The employee told me that for the specific subwoofer that I had, Rockford Fosgate P3D4-12, I need 1.0-1.03 cubic feet of air space, including the dimensions of the subwoofer. I have had to construct the dimensions of the walls in .75 inch thick MDF (Medium Density Fiberboard), to produce great sounding acoustics. I did not go into this assignment with much knowledge to begin with, but after learning about different concepts of sound and subwoofers, I have created this layout of what the subwoofer will form into.
Outside resource:
I visited a music/sound store on 23 E 8th St, Holland, MI 49423, where they sold a variety of speakers and headphones, hoping to gain some outside knowledge on the subject. I spoke with an employee at the building where firehouse guitars used to be and they told me that there is a certain formula to calculate the cubic feet in a box for subwoofers. (Length x Width x Height) in feet, which I would use my dimensions of a box: (14in x 18-.75in x 10-.75in) - the .28 cubic feet of the subwoofer to give me 1.1 cubic feet of air space in the box enclosure. (wedge would use the triangle area formula base x height x .5 using 8 and 12 inch lengths for the top and bottom plane pieces). This employee helped me greatly saying that a box enclosure is the most important part and that a curved enclosure can change the frequency of sound drastically because it affects the way the sound waves are projected. It shows that professionals in this field have know the sound engineering of how waves are projected, which I never would have guessed.
I spoke with a audio-engineer in a local business in downtown Holland and found important information regarding the layout of this subwoofer box. The employee told me that for the specific subwoofer that I had, Rockford Fosgate P3D4-12, I need 1.0-1.03 cubic feet of air space, including the dimensions of the subwoofer. I have had to construct the dimensions of the walls in .75 inch thick MDF (Medium Density Fiberboard), to produce great sounding acoustics. I did not go into this assignment with much knowledge to begin with, but after learning about different concepts of sound and subwoofers, I have created this layout of what the subwoofer will form into.
Outside resource:
I visited a music/sound store on 23 E 8th St, Holland, MI 49423, where they sold a variety of speakers and headphones, hoping to gain some outside knowledge on the subject. I spoke with an employee at the building where firehouse guitars used to be and they told me that there is a certain formula to calculate the cubic feet in a box for subwoofers. (Length x Width x Height) in feet, which I would use my dimensions of a box: (14in x 18-.75in x 10-.75in) - the .28 cubic feet of the subwoofer to give me 1.1 cubic feet of air space in the box enclosure. (wedge would use the triangle area formula base x height x .5 using 8 and 12 inch lengths for the top and bottom plane pieces). This employee helped me greatly saying that a box enclosure is the most important part and that a curved enclosure can change the frequency of sound drastically because it affects the way the sound waves are projected. It shows that professionals in this field have know the sound engineering of how waves are projected, which I never would have guessed.
Thursday, April 25, 2013
25 April 2013 (through May 17)
Understanding the basic principles of sound (change from list form to paragraph explanation)
A sound-wave is a vibration of molecules traveling through a medium through the ear, where it is interpreted as sound. Soundwaves contain compressions which are where air molecules are pushed together by vibrations, and rarefactions which are when molecules are far from each-other. Sound waves travels through various mediums like liquids, gasses (they travel fastest through these), and solids, but not through empty space. There are frequencies of sound based on the amplitude of the wave that we humans can detect, but we can only only a certain range of sound. In a speaker, a current travels through a magnetic field of a current and creates vibrations in a cone, which projects sound for the listener.
http://www.jiscdigitalmedia.ac.uk/guide/the-physical-principles-of-sound/
Check "Designing, Building, Testing..." book
sound terms (glossary form)
-acoustics (speaker and room)
-Reflective
-Absorbant
-Diffusive
-compression and refraction
-sound waves
-Peak displacement/ equilibrium
-sine waves/amplitude
-phase
-frequency and pitch (higher frequency is faster shorter waves, lower is longer slower waves)
-Sound energy is created as a currency flows through a series of magnetized coils and a cone vibrates creating different frequency levels.
-decibel
-
sound equipment:
acoustical rules of speaker placement with sound behavior. (paragraph form)
-acoustics (speaker and room)
-Reflective
-Absorbant
-Diffusive
A sound-wave is a vibration of molecules traveling through a medium through the ear, where it is interpreted as sound. Soundwaves contain compressions which are where air molecules are pushed together by vibrations, and rarefactions which are when molecules are far from each-other. Sound waves travels through various mediums like liquids, gasses (they travel fastest through these), and solids, but not through empty space. There are frequencies of sound based on the amplitude of the wave that we humans can detect, but we can only only a certain range of sound. In a speaker, a current travels through a magnetic field of a current and creates vibrations in a cone, which projects sound for the listener.
http://www.jiscdigitalmedia.ac.uk/guide/the-physical-principles-of-sound/
Check "Designing, Building, Testing..." book
sound terms (glossary form)
-acoustics (speaker and room)
-Reflective
-Absorbant
-Diffusive
-compression and refraction
-sound waves
-Peak displacement/ equilibrium
-sine waves/amplitude
-phase
-frequency and pitch (higher frequency is faster shorter waves, lower is longer slower waves)
-Sound energy is created as a currency flows through a series of magnetized coils and a cone vibrates creating different frequency levels.
-decibel
-
sound equipment:
acoustical rules of speaker placement with sound behavior. (paragraph form)
-acoustics (speaker and room)
-Reflective
-Absorbant
-Diffusive
Tuesday, April 23, 2013
23 April 2013
I put this speaker on full volume on all sources and It is still fairly quiet. The speaker might need to be smaller w/ that output but it projects volume nicely. I know about the inner workings of speakers now and will soon replicate this in a more powerful speaker.
22 April 2013
I brought a headphone amplifier and used that as a constant power source to the speaker. It works! I replaced the springs and it can successfully output music.
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