1. Lab work done and physics learned:
For this project I had to do a lot of lab work. Reading the two books took up a lot of time and provided a lot of information. I learned a lot about the speakers including crossovers, box design, wiring, caulking, and assembling.
2. Specific goals and how could they change:
I think that the goals of this project were to read the books, do the decibel test, dead zone test, and building the speakers themselves. I think these goals are fitting and coincide with each other in the learning of speakers.
3. Outside the classroom:
Outside of the classroom I had to do decibel tests, the dead zone test, and the building of the speakers. I spent a lot of time doing each of these. The speakers by far took the longest. But I am proud of them and can now listen to them everyday. Meniscus will definitely be my first stop for all my speaker needs.
4. Grade deserved:
I think that I deserve an A on this project. I did everything that I needed to except for posting pictures of what I've done. I have all of the pictures on my phone but the problem is that I cannot figure out how to get them out and onto my computer. Other than that I learned a lot and I think that's what this project was designed for.

The first step in building my speakers was going to Menards and picking up the 4x8 sheet of MDF 3/4" wood. We then went to the shop I worked at for the summer, Novodai. They have a CNC machine that cuts out the wood in precision accuracy. I drew up the dimensions on the computer and then the machine did the rest of the work. I then went and glued each peice together making sure they were air tight. After the boxes were taking shape I left the faceplate off, caulked the inside, and wired up the crossovers. Finally the faceplate went on and my speakers were alive with fantastic sound. They don't cover every pitch but the music that comes out of them sounds great!

After going to my church Faith CRC we found only one dead zone right on the center of the stage. The speakers were located near the ceiling in the middle and sides of the front of the sanctuary. The church has good acoustics since the walls and ceiling both widen and get taller as you get towards the back of the sanctuary. I would add something on the walls to reflect the sound and create a more steady decibel reading to all of the church.

Procedure:

Set the decibel reader1 meter away from the speakers. Calibrate it to 1000 Hz at 75 dB. Procede to play the different frequencies and record your data.

Conclusion:

After looking at all of the curves of each set of speakers it appears that they all have difficulties with the high frequencies. I think this is because we do not hear these frequencies in our songs or movies so it is not necessary to have those high frequencies. Otherwise most of the speakers were average and none really stuck out as the best.

Test