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Professor Apex's Articles in Accounting

  • CAR AUDIO MISCELLANEOUS
    What is Alternator Noise?
    Alternator noise is a high pitched whine caused by the car's electrical system. If the engine spins quicker, noise frequency is higher. That is why you would hear alternator noise coming from mids and tweeters, but not subwoofers, since subwoofers only play low frequencies
  • CAR STEREO WOOFER BOXES
    Enclosures for Car Audio Woofers:
    Because woofers move a lot of air they generate a back wave behind them. Mounting a woofer in a free space without an enclosure will cause a loss of bass as the back wave cancels the sound from the front of the woofer. There are many different types of enclosures for
  • CAR STEREO SYSTEMHEAD UNITS
    Head Units Overview
    In a perfect world, your head unit would be used to provide a signal to your amplifiers that is line level and you would not use its internal amplifiers (if any). They typically do not have the power and strength to drive speakers both loudly and cleanly. The line level signal is
  • CAR AUDIO SYSTEMHEAD UNITS
    Head Units Overview
    In a perfect world, your head unit would be used to provide a signal to your amplifiers that is line level and you would not use its internal amplifiers (if any). They usually do not have the power and strength to drive speakers both loudly and cleanly. The line level signal is cl
  • Planning Your Car Audio System
    Planning Your System
    This part of the game can be fun or disappointing depending on what you can do. I will demonstrate an example system that builds a decent system. After that I will show you how to make trade offs and leave out parts that may not be as key to you to keep your system within your bu
  • CAR AUDIO SPEAKERS
    Speakers Overview:
    The car audio you use will have the definitive say in how your system will sound. There are many different types of speakers available. A single speaker can be used to reproduce the full range of sounds but it is not ideal. If the speaker is too great it will have problems reproduc
  • CAR SUBWOOFERS
    Subwoofer Definition:
    A loudspeaker designed to reproduce bass frequencies.

    Subwoofer Selection Tips
    When deciding to upgrade your audio system, adding a subwoofer can produce massive results. Adding volume at sub frequencies is like adding a third dimension to your music. Whether you’re consideri
  • CAR AUDIO ACCESSORIES
    Installation Accessories
    There are many accessories that are available for your car stereo. Some of them are key such as RCA cables and others are elective like wiring harnesses.

    RCA Cables:
    These are the cables needed used to transfer pre-amp (line level) signals. Usually, you use this kind of cabl
  • CAR AUDIO SIGNAL PROCESSING
    Equalizers/Crossovers Basics
    Equalizers allow you to fine tune your system. It is hard to get speakers to reproduce sound flawlessly. Multiple speaker system things are even more difficult. With an equalizer you can boost or cut certain frequency ranges to tailor the overall sound to whatever you des
  • CAR STEREO REFERENCE MATERIAL
    Car Audio Dictionary:

    A: Attenuation, loss of dB. AC (Alternating Current): An electrical current that intermittently changes in magnitude and direction. Acoustic

    Fiberglass: Thin fiberglass material used as damping material inside speaker enclosures.

    Acoustics: The science of sound.

    Air Gap: Th
  • Amplifiers
    Amplifier Overview
    Your amplifier takes the signal from your head unit and makes it big enough to be able to drive your speakers. It is better to use separate amps for high and low frequencies but it is not needed. The problem with using one amp for all frequencies is that you cannot adjust the level
  • CAR STEREO MISCELLANEOUS
    What is Alternator Noise?
    Alternator noise is a high pitched whine caused by the car's electrical system. When the engine spins the alternator around, the alternator induces an AC voltage that is converted to DC and used to charge the car's electrical system. It acts like an inverted electric motor (
  • CAR AUDIO WOOFER BOXES
    Enclosures for Car Audio Woofers:

    Because woofers move a lot of air they generate a back wave behind them. If you mount a woofer in free space without an enclosure you will get almost no bass because the back wave will cancel out the sound from the front of the woofer. There are many varieties of t


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