Hello,

How you doing? i am writing this with tears in my eye,i went to London England for a short vacation  only to get robbed at gun point last night.All cash credit card and my cell phone was stolen of me by the muggers,it was a brutal experience. i am really freaked out here at the moment,But i thank God i still have my life and passport save here with me,My return flight leaves in a few hours but I’m having troubles sorting out the hotel bills,wondering if you could loan me some money to sort out the hotel bills and also take a cab to the airport about (2000$). I have been to the police and embassy here, but they aren't helping issues, I have limited means of getting  out of here,  I canceled my cards already and made a police report, I won’t get a new card.

Please get back to me ASAP.

1. I feel that my project was pretty balanced between lab and physics. I learned a lot of new physics concepts from the books that I took notes on, however this didn't really have an affect on my project. Even though I learned from these books, the actual lab building of the speakers was much more woodworking and less physics. I think overall I spent more time on the labs between doing speaker tests and going to Meniscus than I did reading the books.
2.  I think that the specific goals of my project were to learn how to build speakers and learn to understand some of the physics behind sound. I think that while I did learn a lot about physics, the project was much more heavily geared to the physical building of the speakers. I think it would be good to have a more comprehensive way to learn the physics besides just taking notes on 2 books.
3. I think that this component was huge in the speaker project. I had to go to an auditorium and evaluate their speakers as well as go to Meniscus in Grand Rapids to build my speakers. I enjoyed this quite a bit, especially going to Meniscus. It was a great experience to see how lots of speakers are built.
4. I think I deserve an A on this project. Although it did take me a while to get some notes on my posterous and the auditorium evaluation was kind of late, I got it all in. All of the components that were on moodle are in my project, and I ended up with some very awesome speakers! I learned a lot about the physics of sound and am very happy with how my speakers turned out, and that was the biggest goal of the project so I feel that I deserve an A.

I went to Park Churches Auditorium. Included in these photos is a diagram of the DB levels in different parts of the auditorium. As you can see, the biggest dead spots are in two corners as well as in the hallways off the side of stage. This makes sense as the sound could easily become deadened in these enclosed areas. Pictures of these areas are included. There were 3 flying speakers facing straight out and to either direction. All in all the room had pretty good acoustics overall but it was definitely not designed for massive amounts of sound.

Update/Speaker choices
While at Meniscus, I chose to use MDF wood as it was the cheapest option available while still being a very good speaker cabinet wood. I also stuffed foam into the cabinet to decrease standing waves. I chose to make a two-way speaker with a woofer and a tweeter. I put the speakers in two corners of my room so as to increase overall resonance in the whole room as opposed to all of it going in one direction.

We went to Meniscus today, built the cabinets and installed the crossovers and drivers, I am done!! the speakers are fantastic

Progress Report
I went to Meniscus and began work on my speakers. I hot glued and sodered the crossovers, and I am going back tomorrow to make the cabinets and install the speakers.

Progress Note
Daniel and I are going to Meniscus tommorow to begin building the speakers. We have notes taken on both books and we are all set to begin the construction.
the end
Mouw

-Speaker Tests
-listening test-self explanatory, test different kinds of music and see how it sounds
-Hiss Test - Listen without anything playing and turn the volume up to see how much static there is
-Listen with only a voice througg the speaker and adjust all components of the amplifier.
-Test with a sound level meter
-use an equalizer

Notes on D, B and T your own speakers
When making speakers, keep in mind 2 things about the area they will be used in
-Actual dimensions
-acoustical size
-Make the speakings according to your musical tastes.
-Position your speakers according to your room size, shape, and acoustical qualities.
-Symmetry is key in speaker balancing

-Parts of the modern speaker: outer cone suspension, the surround, and
the spider (the coil centered device)
-One way to solve problems with full range speakers is to add a
secondary cone, called a whizzer.
-A whizzer cone is less expensive then a separate tweeter because it
is driven by the same magnet and voice coil as the main one. It can
improve the highs as well as extend the frequency range.
-Cone reduction - reducing the weight of the main cone, making the
cone be able to emit sounds at relatively high frequencies
-transient response - a speakers ability to handle short pulses
without altering their duration.
hangover - sound that is carried after the sound stops.
Impedance - the opposition of the voice coil to current flow at any frequency
Inductive reactance - the tendency that a coil resists the flow of
high frequency current
Capacitive reactance - opposite of inductive.
Driver - any direct radiator speaker: woofer - low frequecncies,
tweeter - high frequencies
Types of Enclosures: Closed-Box, Ported-Box, Labyrinth and
Transmission Lines, and Horns
Speaker Placement: highest frequencies speaker on top, and lowest on the bottom
Most common materials for building speakers:
- 3/4 inch plywood, particle board, or medium density fiber board.
Panel thickness should be chosen according to enclosure size.
- if you chose plywood, get a good grade, like birch or walnut.
- Particle Board is a good choice because of its high density, lack of
voids or loose layers, and low cost
- Some prefer medium density fiber board because it is better damped.
- If joints don't match well, then use epoxy. It's more expensive, but
it is good for gluing braces in place between opposite panels
Construction Rules:
- Make a rattle-free box
- Make the box Airtight
- Don't forget damping material
- Install drivers from outside the box
- Don't use thick material on your speaker for decoration

Balance is the best way to tell if the speakers are good or not
 
To make the speakers you want, look at what you are trying to get out
of them and what they are going to be used for, and then use equipment
accordingly
 
Input Sensitivity - what power level at the input of an amp will
produce its full rated power at the output.
 
Equalizer - a whole range of systems designed to cut and boost the
signal level of specific frequencies.
 
Speaker connection - pg 225 - pg 227
 - Series
 - Parallel