technicalbar2.GIF (1843 bytes)

technicalhead.gif (3085 bytes)

Welcome to the almighty shrine of technical knowledge. Here, teamROCS members and special guests have written a total of 67 hard hitting and very interesting crap about mobile electronics, car audio, and the science behind it.

Any questions, revisions, suggestions, submissions, or random cussing should be directed to The Lizard, the teamROCS Technical Director. Before you go burning shit up, read the disclaimer.

 

Electronics
 
  • The Team ROCS Ohms Law Calculator
    Your browser must have Javascript enabled for this to work. However, it's a handy tool for back of the envelope calculations, and for playing with the variables in Ohms Law. - Andrew Krause
  • Measuring Amplifier Output
    Is your amp performing as expected? You might be suprised! This article teaches you the fundamentals about measuring your amplifiers output power - Eddie Runner
  • Resistance vs. Impedance
    Resistance (R) and Impedance (Z) are two different words for the same idea...or are they? Get the "dl" on how a speaker with 4 ohms of resistance rarely actually has 4 ohms of impedance. - Andrew Krause
  • Capacitors
    These are one of the least understood componants in the world, thanks to alot of voodoo marketing by the car audio industry. Learn what they do, and how they do it. - Andrew Krause
  • Connecting Speakers
    It's such a simple thing to do, no wonder people get it wrong so often! Hey, if it were hard, then you'd pay attention right? Learn the difference between parallel, series, and series-parallel circuits as they relate to hooking up multiple drivers. - Jonas Holmgren
  • Roll Your Own
    No, not THAT! This article outlines some key points on selecting componants for crossovers.
  • Two Way Crossovers
    You can save a bundle when you buy your drivers separately from catalogs, but you still need crossovers. This article outlines the construction of two crossover networks based on the Linkwitz-Riley and Butterworth networks. - Jonas Holmgren
  • Relay Basics
    With all the electrical crap you're putting in your car, you are eventually going to need a relay. This article explains how to use the standard Bosch-type SPDT relay. - Andrew Krause
  • Fusing
    Fusing. Save your equipment from surges, and more importantly, save your car from catching on fire. - Matt Walters
  • What is "class D"?
    Still a buzz word in the audio industry, class D amps provide incredible efficiency and awesome performance. But what makes it different from Class A, Class B, and Class A/B amps? - Grizz Archer
  • Multi-Mode Operation
    Believe it or not, any amp is "multi mode" capable. This article explains why and how you can use this flexible feature of an amplifier to build awesome budget systems. - Andrew Krause
  • Testing Wires
    Unless you're a redneck, you've likely got a digital multimeter that you use for seeing if there is voltage on a wire. But a DMM is capable of so much more. Learn how to use it to test wires and determine their function. - Andrew Krause
  • The Truth about Head Unit Power
    So, you bought a CD player that claims to have 100 watts of power. Read this article to understand why their 100 watts isn't your idea of 100 watts - Andrew Krause
  • Advanced Test Gear
    You can do most tests in car audio with just a basic DMM, your eyes, and your ears. But when it gets critical, you need to break out the big guns. Eddie Runner demonstrates some test equipment that he uses to do professional quality work. - Eddie Runner

 

Speakers & Enclosures
 
  • Aiming Your Subwoofer Box
    Examine the myths and realities as to why your sub often gets louder when you face it to the rear. - Eddie Runner
  • Enclosure Types and Comparisons
    Wondering what kind of box you need? This article won't answer that question for you, but it will help you understand the differences between designs before you go shelling out big bucks for a box you may not like the sound of. - Jonas Holmgren
  • Aperiodic Membranes
    A-what membranes? Grizz Archer (the "Pierce-ed One") breaks down one of the most misunderstood devices in autosound. If you've never heard of an aperiodic mat, then impress your friends and pick up chicks with the info in this article. - Grizz Archer
  • Connecting Speakers
    It's such a simple thing to do, no wonder people get it wrong so often! Hey, if it were hard, then you'd pay attention right? Learn the difference between parallel, series, and series-parallel circuits as they relate to hooking up multiple drivers. (Yes, you did already see this article listed). - Jonas Holmgren
  • Vented Loudspeaker Enclosure Construction and Operation
    Geekspeach in effect here: This article sounds like an owners manual, but contains lots of good info on what we commonly refer to as a "ported box".
  • Notes on Porting
    Drew Daniels (not a tR member) provides some observations you may want to keep in mind whenever you design ported enclosures.
  • teamROCS Box Calculator
    Similar to the Ohms Law Calculator, this page allows you to get quick volume measurements by tossing in some dimension values. If you've tried to use this before, but found that it was all assed up, it is fixed now. - Andrew Krause
  • Massloading Transducers
    Don't panic - this doesn't involve nuclear fussion. Massloading is the adding of weights to a speaker to change its response. - Grizz Archer
  • Get a Gauge
    Selecting the proper wire size for your system is critical. Too small of a wire will choke your audio chicken, but too large of a wire is just wasted money. - Jason Schuren
  • Overcoming the Problem of "Trunk Bass"
    Trunk bass? Yes, trunk bass. The booming, rattling, sound trap of your trunk may be killing your ability to drop bombs - Grizz Archer
  • Speaker Box Construction
    A good box should be able to double as a coffee table or building foundation. Get the low down on joinery and bracing as it applies to audio construction. - Eddie Runner
  • Transfer Functions
    Don't worry, this isn't going to get all technical and bombard you with crap like "systems of linear equations in three variables". This article describes how to model the response of audio in the car, and predict how it will act (and there's not one f(x) or equation in the entire article) - Eddie Runner

 

The Science of Autosound
 

 

Installation and Fabrication
 
  • Installing and Setting Up an Amplifier
    As easy as this is to do, lots of folks get intimidated by it. Save yourself a few bucks, and know that you've done it right, by learning how to install an amp yourself.
  • Adjusting your Gain
    They're not volume knobs Eddie! But, if you want to understand how gains function, it's useful to think of them as little volume knobs. Eddie Runner outlines what gains do. - Eddie Runner
  • Sound Proofing
    Getting rid of those little squeaks and rattles isn't as hard (or expensive) as you might think.
    - Andrew Krause
  • Vented Loudspeaker Enclosure Construction and Operation
    Geekspeach in effect here: This article sounds like an owners manual, but contains lots of good info on what we commonly refer to as a "ported box". (Yes, you saw this listed already).

  • Keep it Cool: Adding Fans to Your Install
    A properly installed amplifier shouldn't thermal out, but in some cases "proper" installation isn't possible. So for those slightly improper cases (or those "shouldn't but did anyway" cases), this article will explain how to add a cooling fan to your install.
    - Andrew Krause
  • Pretty Little Lights
    Adding LED's to your install is all the rage. Nowadays there are dozens of LED kits, but to get really trick you need to know these simple rules for installing LED's, especially ones not made for 12 volt systems
    - Andrew Krause
  • Multistage Gain Adjustment
    I don't care what your POS amp says, that little dial is not a "gain". It merely adjusts the impedence of the input stage of the amplifier. Grizz explains how to properly adjust "gains" on systems with multiple level settings so you can achieve quality sound. - Grizz Archer
  • Testing Wires
    Unless you're a redneck, you've likely got a digital multimeter that you use for seeing if there is voltage on a wire. But a DMM is capable of so much more. Learn how to use it to test wires and determine their function. - Andrew Krause
  • Materials for Construction
    Custom car audio calls on a number of materiels. Learn of some of the available materiels and their uses. - Andrew Krause
  • Painting Plastics
    Plastics are peculiar - some paint easily, others hate it. This article tells you how to get the best finish on plastics. - Andrew Krause
  • Basic Installer Tools
    The ability use tools is what makes a man a man. As an installer, you should have a few basic tools, but don't start buying the Snap-On truck out just yet.- Eddie Runner
  • Proper Grounding
    This is likely the biggest cause of poor audio performance there is! These four simple tips will prevent you from making a mockery of quality audio.
  • Connections
    Unless you're the type to twist two wires together and smack bubble gum on them, this page will tell you how to make good solid electrical connections - Jason Hodges

  • Trouble Shooting Noise
    Got noise in your music? This article will help you track down the cause of that noise (unless it's that gay techno shit you listen to). - Alan Ward

  • Measuring Amplifier Output
    Is your amp performing as expected? You might be suprised! This article teaches you the fundamentals about measuring your amplifiers output power - Eddie Runner

  • Transfer Functions
    Don't worry, this isn't going to get all technical and bombard you with crap like "systems of linear equations in three variables". This article describes how to model the response of audio in the car, and predict how it will act (and there's not one f(x) or equation in the entire article) - Eddie Runner


 

Errata
 
  • Warranties
    Your options in making sure your audio equipment is protected - Andrew Krause
  • Sony's Rotary Commander Revealed
    If you've got a Sony headunit that comes with the rotary commander, get ready to really trick it out - Andrew Krause
  • Interconnect Myths
    If you're spending more than a buck a foot on RCA's, chances are you're spending way too much. Buy interconnects; don't buy the hype - Andrew Krause
  • CB Radios and You
    They were a dying breed, what with cell phones an FRS radio, but CB's are starting to make a comeback. Find out the 10-20. - Eddie Runner

  • Mobile Multi-Media
    I wrote this article way back when putting screens in car was new. Now you can buy cars with built in TV monitors - Andrew Krause
  • What is Good Sound
    Largely an editorial, this paper gives some insights and perspectives into what "sounding good" is really about - Andrew Krause
  • Ham Radio
    TWFER is a ham in more ways than one - he actually uses shortwave radio to broadcast the location of his vehicle at any given time (it's not a good idea to try to take Eddies truck). Learn more about the exciting world of amature radio.- Eddie Runner

  • Buying Car Audio on the Internet
    Caveat Emptor - buyer beware. It was never more true than in the world of online car audio, wher fly by night Internet sites try to convince you that price is more important than service.- Eddie Runner

  • Multi-path Interference
    This is that fluttering noise you get on FM when you drive between tall buildings. Eddie breaks it down - Eddie Runner

 

External Links


These are some sites that we've found useful. teamROCS does not necesarily endorse these sites, nor are we necessarily endorsed by them. However, the information found on these sites will prove useful, dangit.
Links open in new browser

  • The Install Dr - Complete and Detailed Instructions for installations on specific vehicles, requires Adobe Acrobat viewer.
  • The rec.audio.car FAQ - Frequently Asked Questions on the rec.audio.car newsgroup (and in spite of this most excellent FAQ, people still FA these Qs).
  • JL Audio Tutorials - A nice and detailed site on subwoofers and enclosures, and even a few other things.

 


techhead.gif (4654 bytes)