http://www.youtube.com/watch?v=tgU1Y83klgI&hl=en
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Box Building
Each type of sub requires it's own type of box. If a sub is installed in a box larger or smaller than what is supposed to, it will sound distorted/bad and could be destroyed. Boxes can be built in many shapes, but it is important that the box volume is calculated accurately to achieve maximum performance.
Materials
A box MUST be very sturdy. Most common building materials are 5/8" or thicker particle board or medium density fiberboard. If building a box with Plexiglas, do not use anything less that 1/2 inch thick. A common material used to mold complex shaped boxes is fiberglass, but it is very hard to work with, and require several layers for a smooth finish.
Gluing, Sealing
Glue should be used at all joints to fill any spaces. Any spaces will degrade the performance of your subs, not to mention the annoying noise air makes when being pushed out of a small hole. On applying the glue, let it cure for at least 24 hours before mounting the subs. This is a precautionary measure to protect the rubbers used to make the subs from the high fumes that some manufacturers glue products have.
Holding Joints Together
In connecting box joints, it is best to screw the joints every four inches or so using 2" - 2-1/2" screws. Pre-drill about 3/4" deep, so that screws do not split the wood at the edges, especially when working with particle/dashboard.
Should I have a Box for Each Sub?
It is advised to have a separate chamber for each sub. Even though not necessary, here are two reasons why such a directive should be taken: First, if one of the subs blows, then the volume of the box will be "twice" as big for the one remaining working sub. This could cause problems and even damage the other sub. The second reason is bracing. Building a box with a divider in the middle will make the box more rigid.
Ports
Ports must be built into your box design to channel out the air made by the sub's vibrations. If a pre-made port is not available, the most common material is PVC. PVC is very rigid, comes in different diameters. Cut the tubing at the desired length. Consider the volume the port takes up when calculating the box volume. Cut a hole in the box. Make sure the hole is as perfect as possible to minimize gaps between the box and the tube. A couple wood braces can be added for screwing the port top the box. Seal the gaps using a proper sealant (Evo Stick or even silicone can be used).
Bracing
Boxes that are more than a foot in width or length or height, should be braced so that the box becomes more sturdy. This can be accomplished with a piece of wood maybe 3 or 4 inches wide across the box). It is a good idea to put wood blocks on the corners for reinforcement. Always consider that blocks, braces, neon lights, etc. inside a box take up space and should be accounted for when calculating internal volume.
Damping/Filling
Damping increases subwoofer efficiency by dissipating some energy that affects the sub, particularly the voice coil. It is advisable to put damping material inside a box. Pillow polyfill and fiberglass insulation are common, though polyfill is a lot easier on your skin. Polyfill also "tricks" a sub into thinking it is in a bigger box. Play around with different amounts of polyfill until you get the desired results.
Making it look professional
Make the box surface free from holes and spaces by adding wood fill. If you decide to paint the box, then you should apply primer first. Carpet or Vinyl padding is the best covering to use since they easily cover any outer blemishes on the box and give the box a 'smooth' outlook. Be careful when cutting the vinyl or carpet since such cutters tend to be very sharp. Cut a piece of carpet (or vinyl) big enough to cover the whole box. Apply adhesive to both box and carpet (EvoStick works great). Wait about a minute and place the fabric over the wood. For the best fit, stretch the fabric when applying it. The fabric should wrap around and end in a place of the box that will not be seen. Do one side at a time, cutting excess carpet. If possible, add staples preferably heavy duty staples that can penetrate the box, to hold the fabric at the ends. NOTE: Do not cover each panel of the box before mounting it together since it would be impossible to find any 'leaks' that may exist in the box design much less fill these leaks.
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In spring, we often see very strong storms. Many times, the wind blows so hard that trees topple over. This is especially true if the tree is already old, weak or has no foundation of firm roots.
I have a beautiful tree in the middle of my backyard. Last year, while having an annual tree trimming, the service informed me of a deep crack in the middle of the tree. The tree service also told me there was no way to save the tree. Therefore, they suggested I cut the huge tree down. However, my instincts told me differently. Instead of removing the tree, I called another service and asked their opinion. They said that even though the tree was weakened by the crack, it could be strengthened by cabling the trunk together. However, they also warned that there was no guarantee that a very strong wind would not split the tree in two despite any cabling. In the end, I opted to trust my intuition and cable the tree.
Throughout the year, despite my gut telling me that everything would be OK, whenever a strong wind came up, I would watch anxiously to see if the tree could withstand the strain. As each storm came and went, my beautiful tree managed to stay upright, and continued to grow.
Several months ago, it was time again to trim my tree. When the tree service arrived, I inquired about the health of my tree. They showed me the crack in the tree. To my amazement, the tree had begun to heal itself. The cable not only reinforced the strength of the tree, but also allowed it to heal. With this knowledge, the service felt the tree had an excellent chance of living for many years.
Many times, we are like my tree-weak in our foundation. Therefore, we may feel as if we do not have the strength to weather the storms of life. However, you may not realize it, but you have more strength than you know. It is the spirit of God within you. The spirit is the cable that can help you withstand any storm. Furthermore, that cable can renew and heal you. There is no guarantee that you still will not topple over because each of us has choice. Either we can choose to allow the spirit to heal us or, conversely, we can ignore it. Why not recognize the beautiful spirit that is part of you, helping you grow higher and higher, fortifying you against any gust of wind?
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You've probably noticed that a good chunk of the world approaches problems, tasks, people, and play differently than you do. If you lead a team, you may have wondered why some people enjoy the camaraderie of team meetings while others suffer through those same meetings hoping they'll begin on time and end quickly. You may have discovered that the drive to action exhibited by some members of your team is balanced by the need to evaluate or analyze expressed by others on the team.
Indeed our workplaces are filled with fascinating, complex people who do and say things that continually surprise us. If you manage a team of diverse people, it is up to you to learn not only how to value these differences but also how to build on these differences. As a first step, you should begin to understand your own communication style, as well as your individual strengths and weaknesses.
It doesn't have to be a complicated process to begin to identify communication style differences. You've probably seen some patterns in yourself and the people you work with. For example, do you:
Like to interact with other OR Prefer to work in solitudeIt's interesting to notice that it doesn't really matter how or why you developed these preferences. It's only important to realize that you have preferences or habits that you tend to rely on make your way in the world. Of course, we all have the capacity to do whatever the situation requires of us but, let's face it: there are some behaviors that simply feel more comfortable to us than others.
Let me give you an example: When a member of my team drops a problem in my lap, my first instinct is to ask questions and gather facts. When I have enough information, I can begin to evaluate my options. When I've thought those options through, I may then recommend a trial solution. Would it surprise you to learn that I prefer an analytical communication style? (We call this style Analyzer at NetSpeed Leadership.)
Now let's think about the team member who has dropped the problem in my lap. Perhaps she is actually a little upset that she didn't catch an error that created the problem. Let's imagine that she feels pretty badly about the issue and hopes that I will take a few minutes to empathize with her discomfort and reassure her that we will work together to fix things. Perhaps she is more concerned about her relationship with me, her boss, at the moment, than she is about solving the problem. Would it surprise you to learn that she prefers a relationship-oriented communication style? (We call this style Anchor.)
As you imagine this scenario, you can probably guess that we would be like two ships passing in the night. Faced with my questioning and fact-gathering, she would probably dissolve into tears, convinced that she had really blown it. If I recognize that she needs empathy and support before she can move to problem solving, we'll probably make greater headway on resolving the problem together.
Without an appreciation of these kinds of style differences, team members can also misunderstand each other, react badly, and experience unnecessary frustration. One member of my team is extremely deadline driven. He has a never-ending task list and gets most of his daily satisfaction from plowing his way through that list. The more activities he accomplishes each day, the better he feels. When he leaves at night, his desk is neatly organized and ready for him to tackle the next day's challenges. It's probably no surprise to hear that he prefers a results-oriented communication style. (We call this style Achiever.)
Now imagine this Achiever working with another team member who loves the creative process. In fact, brainstorming, playing with ideas, and researching creative solutions consume a good portion of her day. If you look in her office, you wonder how she can find anything on her desk. There are stacks of paper everywhere, magazines open to interesting articles, sticky notes with ideas, a collection of books, and a steno pad with notes, lists, random thoughts and important phone numbers. She delights in popping into the Achiever's office and brainstorming ideas with him. You can guess that she prefers a communication style that is creative, and certainly not deadline-driven. (We call this style Adventurer.)
If I want to develop synergistic teamwork, then I must not only select team members who exhibit these differing styles, but I must also make sure that they value these style differences in their teammates. Otherwise the team will waste a good deal of time disagreeing over style differences rather than negotiating good working strategies that meet everyone's needs.
So, as a team leader, where should you begin? Consider inviting each team member to share a few accomplishments with other team members at a team meeting. As that team member speaks of these proud moments, everyone else records the gifts, talents, and skills they demonstrated to be successful.
For example, imagine the Achiever describing his accomplishment of completing the New York marathon. He describes the daily training he did, the training plan he developed, the goals he set, his commitment to running the race despite unusually high heat on race day, and his satisfaction of meeting his personal goal: running the marathon in under 4 minutes. Team members might note gifts, talents and skills such as goal-setting, perseverance, commitment, results-oriented, disciplined and self-directed. As they note these positive qualities, they begin to see what their fellow team member has to offer the team.
Next, consider introducing the team to communication or behavior styles. At NetSpeed Leadership, we offer a three-hour training module called Working with Communication Styles to help organizations develop the awareness of style differences, the language of appreciation, and the ability to capitalize on these differences. As each team member begins to understand his or her own preferences and moves from judging others who exhibit different styles, to appreciating and building on those style differences, your team begins to mature. And your job as team leader becomes just a little bit easier.
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