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Actual for You - A Technical Introduction to Audio Cables
In our industry, one of our jobs as design experts is to maneuver pitfalls that arise for our clients both experienced and inexperienced. There are four primary areas where we provide this kind of guidance to our clientele; strategy, conceptualization, layout and production. The funny thing is the most detail-oriented area, production, seems to be the one arena where many clients retain an overwhelming do-it-yourself mentality. In the next series of newsletters, I would like to explain from a fairly high level view and from professional experience what goes into production of a project; vendor selection, production costs, file prep, press checks and the outcome.Vendor Selection Thinking that all printers can produce your file properly is like saying all cars are the same. As you know, some cars ride smoothly, some bumpy, some are sleek and others just plain get you from point A to point B (most of the time) but it all falls back to the old clich? "you get what you pay for." Each printer is setup differently with different equipment. Many printers can handle all trim and finishing effects, like foil, in-house while others have to outsource your job to be completed. Some printers can handle a 7-color job on one press while others only carry digital solutions. Have I confused you yet? No? Good. Then here are four basic things to think about when
- Inductance opposes changes in current. If current is increasing, inductance will cause the current to increase more slowly. If current is decreasing, inductance will cause the current to decrease more slowly.
The final piece of background knowledge that is needed for this article is what the audio signal looks like. If one were to take the speaker cover off a speaker to look at the speaker cone while music is playing, you would see that it is moving back and forth. In order to move the speaker cone back and forth, the electrical signal must push and then pull the cone in rapid and repeating fashion. This is accomplished by having an Alternating Current, or AC.
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One of the most common questions asked by consumers faced with purchasing cables for their audio or home theater system is, “What is so important about cables anyway?” They can cost as much or more than some of the hardware in the system and to many it is difficult to understand why wire isn’t just wire.
To begin to understand how audio cables work, we have to start with the two fundamentally different types of audio cables you are likely to have in your system. The first type of cable is called an interconnect, which is used to connect various components together (such as a CD player to a receiver). The second type of cable is called the loudspeaker cable (this is the wire going from the receiver or amplifier to the speakers). It is important to realize that both types of cables are carrying the same information, just with different amounts of energy.
Interconnects carry a signal with very little energy. These cables only need just enough energy to convey the information from the source, for example a CD player, to the amplifier. The low energy requirement means that the signal in interconnects has very little current (usually in the range of thousandths of an amp).
Loudspeaker cables on the other hand, carry a large amount of energy. All of the energy required to move the speaker cones and make sound must come through the loudspeaker cables. Because of the high-energy requirement in these cables the current is relatively high (currents can reach 10 amps or more).
The very basic reason why audio cables are important is because they change the signal going through them. There are two different, fundamental ways that an audio cable can change the signal. The cable itself can change the signal, or the cable can allow outside sources of energy to change the signal.
In order to understand how these two situations can occur, some basic background electrical knowledge is needed.
Signals in all types of wires are conveyed by the combination of voltage and current. Every signal has some amount of voltage and some amount of current. The larger the difference in voltage between two places, say the beginning and the end of a cable, the larger the amount of current, and vice-versa. The direct analogy to voltage and current is the flow of water through a hose. The amount of water flowing through the hose is analogous to current. The water pressure in the hose is analogous to voltage. The higher the amount of water pressure, the more water will flow through the hose. The higher the amount of voltage, the more current will flow through the wire.
Every cable has a set of electrical properties that can be measured using standard electrical testing equipment. The three most basic properties are resistance, capacitance and inductance. While a detailed description of these three different electrical properties is outside the scope of this article, a basic description of the relevant effects of these three properties can be given.
- Resistance opposes current. The higher the resistance the greater the amount of energy that is removed from the current and turned into heat.
- Capacitance opposes changes in voltage. If a voltage is increasing, capacitance will cause the voltage to increase more slowly. If a voltage is decreasing, capacitance will cause the voltage to decrease more slowly.
- Inductance opposes changes in current. If current is increasing, inductance will cause the current to increase more slowly. If current is decreasing, inductance will cause the current to decrease more slowly.
The final piece of background knowledge that is needed for this article is what the audio signal looks like. If one were to take the speaker cover off a speaker to look at the speaker cone while music is playing, you would see that it is moving back and forth. In order to move the speaker cone back and forth, the electrical signal must push and then pull the cone in rapid and repeating fashion. This is accomplished by having an Alternating Current, or AC.
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Interconnects carry a signal with very little energy. These cables only need just enough energy to convey the information from the source, for example a CD player, to the amplifier. The low energy requirement means that the signal in interconnects has very little current (usually in the range of thousandths of an amp).
Loudspeaker cables on the other hand, carry a large amount of energy. All of the energy required to move the speaker cones and make sound must come through the loudspeaker cables. Because of the high-energy requirement in these cables the current is relatively high (currents can reach 10 amps or more).
The very basic reason why audio cables are important is because they change the signal going through them. There are two different, fundamental ways that an audio cable can change the signal. The cable itself can change the signal, or the cable can allow outside sources of energy to change the signal.
In order to understand how these two situations can occur, some basic background electrical knowledge is needed.
Signals in all types of wires are conveyed by the combination of voltage and current. Every signal has some amount of voltage and some amount of current. The larger the difference in voltage between two places, say the beginning and the end of a cable, the larger the amount of current, and vice-versa. The direct analogy to voltage and current is the flow of water through a hose. The amount of water flowing through the hose is analogous to current. The water pressure in the hose is analogous to voltage. The higher the amount of water pressure, the more water will flow through the hose. The higher the amount of voltage, the more current will flow through the wire.
Every cable has a set of electrical properties that can be measured using standard electrical testing equipment. The three most basic properties are resistance, capacitance and inductance. While a detailed description of these three different electrical properties is outside the scope of this article, a basic description of the relevant effects of these three properties can be given.
- Resistance opposes current. The higher the resistance the greater the amount of energy that is removed from the current and turned into heat.
- Capacitance opposes changes in voltage. If a voltage is increasing, capacitance will cause the voltage to increase more slowly. If a voltage is decreasing, capacitance will cause the voltage to decrease more slowly.
- Inductance opposes changes in current. If current is increasing, inductance will cause the current to increase more slowly. If current is decreasing, inductance will cause the current to decrease more slowly.
The final piece of background knowledge that is needed for this article is what the audio signal looks like. If one were to take the speaker cover off a speaker to look at the speaker cone while music is playing, you would see that it is moving back and forth. In order to move the speaker cone back and forth, the electrical signal must push and then pull the cone in rapid and repeating fashion. This is accomplished by having an Alternating Current, or AC.
<March is the month to promote! With that in mind, here are 31 ways you can leverage Small Press Month, one for each day of March. Time to get started!Mar 1 - If you do not have enough author's copies on hand, contact your publisher and order more so they arrive in enough time to pursue these other tips throughout the month.Mar 2 - Contact other independent published authors in your area (through local associations you may belong to) and combine your resources to fully exploit the opportunities during this month. There's a lot to do, and four hands are better than two.Mar 3 - Contact your local bookstores and suggest they offer discounts on Small Press books. Bring in yours and offer it to them at a discount to get them started. Show them the rest of this calendar as a way of indicating your commitment to making their event successful. Offer to leave a free copy with them along with a sales sheet.Mar 4 - Contact your local newspapers and inform them of Small Press Month (in case they don't know about it). Suggest they write a small article or events calendar for Small Press events in the area, specifically the ones you secured on March 3rd. Tell them you will be sending them a press release on the 5th.Mar 5 - Send a press release to the local media (newspapers, radio, television) mentioning Small Press Month and your indepen
In order to understand how these two situations can occur, some basic background electrical knowledge is needed.
Signals in all types of wires are conveyed by the combination of voltage and current. Every signal has some amount of voltage and some amount of current. The larger the difference in voltage between two places, say the beginning and the end of a cable, the larger the amount of current, and vice-versa. The direct analogy to voltage and current is the flow of water through a hose. The amount of water flowing through the hose is analogous to current. The water pressure in the hose is analogous to voltage. The higher the amount of water pressure, the more water will flow through the hose. The higher the amount of voltage, the more current will flow through the wire.
Every cable has a set of electrical properties that can be measured using standard electrical testing equipment. The three most basic properties are resistance, capacitance and inductance. While a detailed description of these three different electrical properties is outside the scope of this article, a basic description of the relevant effects of these three properties can be given.
- Resistance opposes current. The higher the resistance the greater the amount of energy that is removed from the current and turned into heat.
- Capacitance opposes changes in voltage. If a voltage is increasing, capacitance will cause the voltage to increase more slowly. If a voltage is decreasing, capacitance will cause the voltage to decrease more slowly.
- Inductance opposes changes in current. If current is increasing, inductance will cause the current to increase more slowly. If current is decreasing, inductance will cause the current to decrease more slowly.
The final piece of background knowledge that is needed for this article is what the audio signal looks like. If one were to take the speaker cover off a speaker to look at the speaker cone while music is playing, you would see that it is moving back and forth. In order to move the speaker cone back and forth, the electrical signal must push and then pull the cone in rapid and repeating fashion. This is accomplished by having an Alternating Current, or AC.
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Every cable has a set of electrical properties that can be measured using standard electrical testing equipment. The three most basic properties are resistance, capacitance and inductance. While a detailed description of these three different electrical properties is outside the scope of this article, a basic description of the relevant effects of these three properties can be given.
- Resistance opposes current. The higher the resistance the greater the amount of energy that is removed from the current and turned into heat.
- Capacitance opposes changes in voltage. If a voltage is increasing, capacitance will cause the voltage to increase more slowly. If a voltage is decreasing, capacitance will cause the voltage to decrease more slowly.
- Inductance opposes changes in current. If current is increasing, inductance will cause the current to increase more slowly. If current is decreasing, inductance will cause the current to decrease more slowly.
The final piece of background knowledge that is needed for this article is what the audio signal looks like. If one were to take the speaker cover off a speaker to look at the speaker cone while music is playing, you would see that it is moving back and forth. In order to move the speaker cone back and forth, the electrical signal must push and then pull the cone in rapid and repeating fashion. This is accomplished by having an Alternating Current, or AC.
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- Inductance opposes changes in current. If current is increasing, inductance will cause the current to increase more slowly. If current is decreasing, inductance will cause the current to decrease more slowly.
The final piece of background knowledge that is needed for this article is what the audio signal looks like. If one were to take the speaker cover off a speaker to look at the speaker cone while music is playing, you would see that it is moving back and forth. In order to move the speaker cone back and forth, the electrical signal must push and then pull the cone in rapid and repeating fashion. This is accomplished by having an Alternating Current, or AC.
Alternating Current simply means that the voltage oscillates between positive and negative. Because the voltage drives the current, this means that the current also goes positive and negative. In other words, the current is going back and forth in the wire, just like the speaker cone. The subtle variations in how fast the voltage and current go back and forth creates the different sounds that we hear when listening to music.
How a cable itself affects the audio signal
Now, going back to the ways that the cable itself can change the signal going through it, let’s consider both types of cables separately.
As stated previously, interconnect cables carry a very small amount of current. Relative to the current the voltage is large. Because of that fact, capacitance is important, but inductance is relatively unimportant. As the voltage oscillates between being positive and negative, the capacitance slows the voltage changes down, and causes delays. This can cause audible distortion in the sound. Because interconnects have very little current, resistance is not much of a factor. Even an interconnect with extremely high resistance will only remove an infinitesimally small amount of energy.
The signal in loudspeaker cables is essentially the opposite of the signal in interconnects. Both cables have the same information, but in loudspeaker cables, the voltage is small and the current is large, relatively speaking. Because of the high current, both resistance and inductance are important in loudspeaker cables. The higher the resistance, the greater the amount of energy that will be absorbed by the cables. The resistance will not cause any distortion, but it will decrease the volume of the sound. The inductance on the other hand, can cause distortion. As the current oscillates between being positive and negative, the inductance slows the current changes down, and causes delays.
How a cable lets outside sources of energy affect the signal
As stated previously, the second fundamental way of altering a signal passing through an audio cable is to introduce outside sources of energy. This outside energy is typically termed “noise”. By definition, if any energy is absorbed by the signal, the signal has been distorted.
There are many potential sources of noise around audio cables. Some of the more common sources of noise, such as radio frequency waves, are familiar to most people. When wiring up a radio, frequently a consumer must attach an antenna. Antennae are intentionally designed to channel radio frequency energy into a stereo. Just like an antenna, it is entirely possible for an audio cable to pick up radio frequency energy. If you are not intending to listen to the radio, this is not a welcome effect.
Electronic components, electrical cords, sound waves, and even the sun, are all capable of creating noise. Electrical cords create electromagnetic fields around them that can transfer energy to a cable. Sound waves create mechanical vibrations that can be transformed into electrical energy that is added to an audio signal. Because there are so many different types of noise, there are many methods used to prevent a cable from picking up noise. Shielding, twisting of conductors, and mechanical damp
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