When we talk about any signal, be it audio, video or data, there is an accompanied reality for alterations and errors made to that signal as it passes through different electronic components, conductors or magnetic fields. While we get concerned when we hear that a component introduces distortion or when we read distortion specifications, distortion is part of nature and is simply unavoidable. Until any distortion reaches a significant level in an analog signal, it can’t be heard or seen.

Starting With A Foundation in Audio Distortion

With that in mind, let’s create a foundation for observing and understanding the properties of an audio signal in the electrical and frequency domains. This information will serve as the foundation for understanding distortion in part two of this article.

Any signal, be it Direct Current (DC) or Alternating Current (AC), can be analyzed in two ways – in its time domain or frequency domain. Understanding the difference between these two observation domains will dramatically simplify the life of anyone involved in the mobile electronics industry.

When we observe a signal in the time domain, we are looking at the amplitude of the signal relative to time. Normally, we would use a voltmeter or oscilloscope to look at signals in the time domain. When we consider a signal in the frequency domain, we are comparing the amplitude (or strength) of individual frequencies, or groups of frequencies within the signal. We use an RTA (real time analyzer) on a computer or handheld/benchtop devices to look at the frequency domain.

Direct Current

When analyzing the amplitude of an electrical signal, we compare the signal to a reference; in 99% of applications, the reference is known as ground. For a DC signal, the voltage level remains constant with respect to the ground reference and to time. Even if there are fluctuations, it is still a DC signal.

If you were to chart the frequency content of a DC signal, you would see it is all at 0 hertz (Hz). The amplitude does not change relative to time.

Let’s consider the DC battery voltage of your car or truck. It is a relatively constant value. Regarding amplitude versus time, it sits around a 12.7-12.9 volts on a fully charged battery with the vehicle off. When the vehicle is running and the alternator is charging, this voltage increases to around 13.5 to 14.3 volts. This increase is caused because the alternator is feeding current back into the battery to charge it. If the voltage produced by the alternator was not higher than the resting voltage of the battery, current would not flow and the battery would not be recharged.

Alternating Current

AC Signal – Time

If we look at an AC signal, such as a 1 kHz tone that we would use to set the sensitivity controls on an amplifier, we see something very different. In the case of a pure test tone like this, the waveform has a sinusoidal shape, called a sine wave. If we look at a sine wave on an oscilloscope, we see a smoothly rolling waveform that extends just as much above our reference voltage as it does below.

AC Signal – Frequency

It is now wise to look at this same signal from the perspective of the frequency domain. The frequency domain graph will, if there is no distortion, show a single frequency. In consideration of an audio signal, the amplitude (or height) of that frequency measurement depends on how loud that single frequency is relative to the limits of our recording technology or measurement device.

Audio

When we listen to someone speak or play a musical instrument, we hear many different frequencies at the same time. The human brain is capable of decoding the different frequencies and amplitudes. Based on our experiences, and the differences in frequency and time response between one ear and the other, we can determine what we are hearing, and the location of the sound relative to ourselves.

Analyzing the time domain content of an audio signal is relatively easy. We would use an oscilloscope to observe an audio waveform. The scope will show us the signal voltage versus time. This is a powerful tool in terms of understanding signal transmission between audio components.

A Piano Note

Middle C – Time

Let’s look at the amplitude and frequency content of a sound most of us know well. The following graph is the first 0.25 seconds of a recording of a piano’s middle C (C4) note in the time domain. This represents the initial hit of the hammer onto the string. If you look at the smaller graph above the larger one, you will see the note extends out much further than this initial .25 second segment.

Middle C – Frequency

We know that the fundamental frequency of this note is 261.6 Hz, but if you look at the frequency domain graphs, we can see that several additional and important frequencies are present. These frequencies are called harmonics. They are multiples of the fundamental frequency, and the amplitude of these harmonics is what makes a small upright piano sound different from a grand piano, and from a harp or a guitar. All of these instruments have the same fundamental middle C frequency of 261.6 Hz; their harmonic content makes them sound different. In the case of this piano note recording, we can see there is a large spike at 523 Hz, then increasingly smaller spikes at 790 Hz, 1055 Hz, 1320 Hz and so on.

Sine vs Square Waveforms

Every audio waveform is made up of a complex combination of fundamental and harmonic frequencies. The most basic, as we mentioned, is a pure sine wave. A sine wave has only a single frequency. At the other end of the spectrum is a square wave. A square wave is made up of a fundamental frequency, then an infinite combination of odd-ordered harmonics at exponentially decreasing levels. Keep this in mind, since it will become important later as we begin to discuss distortion.

Noise Signals

Noise is a term that describes a collection of random sounds or sine waves. However, we can group a large collection of these sine waves together and use them as a tool for testing audio systems. When we want to measure the frequency response of a component like a signal processor or an amplifier, we can feed a white noise signal through the device and observe the changes it makes to the amplitudes of different frequency ranges.

White Noise – Time

You may be asking, what exactly is white noise? It is a group of sine waves at different frequencies, arranged so the energy in each octave band is equal to the bands on either side. We can view white noise from a time domain as shown here.

White Noise – Frequency

We can also view it from the frequency domain, as displayed in this image.

Variations In Response

The slight undulations in the frequency graph are present because it takes a long time for all different frequencies to be played and produce a ruler-flat graph. On a 1/3-octave scope, the graph would be essentially flat.

Foundation For Time And Frequency Domains

There we have our basic foundation for understanding the observation of signals in the time domain and the frequency domain. We have also had our first glimpse into how harmonic content affects what we hear. Understanding these concepts is important for anyone who works with audio equipment, and even more important to the people who install and tune that equipment. Your local mobile electronics specialist should be very comfortable with these concepts, and can use them to maximize the performance of your mobile entertainment system.

If you’ve made it this far and want to learn even more about audio distortion, CLICK HERE for Part 2 of this article!

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

 

Several aspects of the automotive industry have always been embraced by hobbyists and do-it-yourself enthusiasts. Being able to say that you created something with your own bare hands would make anyone feel proud. In the mobile electronics industry, carmakers have been rapidly advancing the technology used in new cars. From computer data networks and advanced vehicle construction materials to elaborate factory audio system tuning, all of these technologies present unique challenges that many people simply aren’t aware of. Failure to compensate for these can wreak havoc with your vehicle’s electrical system, damage the products you are installing or simply result in poor performance from your audio equipment.

Let’s look closely at why it’s best to put the reliability of your vehicle, and the performance of your audio equipment, in the hands of a a shop offering professional installation.

Computers

Automobile manufacturers are always striving to make their vehicles as fuel-efficient as possible while offering the latest technologies and features. One way they save weight is by putting different devices and computers on a computer data network. Rather than running a myriad of control wires from component to component, they run power and ground, and a pair of data wires. Everything from door locks and trunk release modules to ABS brake and traction control systems can talk to each other on the data network.

Where these networks pose a challenge is when you want to add or remove something from the vehicle. Say you have a vehicle that has a secondary radio display in the dash, but you want to upgrade your audio system. The display may get very upset when you take the radio away. Likewise, you typically can’t add new devices to the data network to add new features.

Your car audio specialist retailers have the experience to work with these data networks. They know what interfaces are available for options like a remote starter or backup camera integration, and they have the manufacturer support to program and install them without causing Check Engine or MIL lights.

Reliability

When working on a vehicle, there are many different ways to run wires and make electrical connections. Automotive mechanics know that it’s hard to beat the knowledge and experience that a veteran car audio installer possesses when it comes to working on vehicle electrical systems. They make dozens, if not hundreds, of electrical connections each and every day.

The connections are electrically sound, offering little to no resistance to current flow. Equally, the connections are mechanically sound, ensuring that they will be at least as reliable as the factory connections, if not much better.

Finally, many shops use materials like split loom, nylon sleeves or cloth tape to protect wires as they run through the vehicle. These protective coverings also make the wiring look as if it came from the factory.

Product Warranty

Many mobile electronics manufacturers offer extensions on their product warranties when the products are sold and installed by an authorized dealer. Authorized retailers have been trained on the features of the products they sell. In the case of high-end brands, this training often extends to techniques and methodologies that make the products sound better in your vehicle, and subsequently last longer. The proper installation and configuration of mobile electronic components is the key to their performance and reliability.

Audio Integration

Factory audio systems are becoming more and more complicated. They still don’t rival what is available from the aftermarket, but they have improved. One big step automakers have made in the performance of their audio systems is in their tuning. More and more factory source units and amplifiers include advanced equalization and time correction to maximize the performance of the audio system. When it comes time to upgrade these systems, installers have the techniques and equipment required to test the signals going to the speakers to determine if signal correction is required. If you omit signal correction when installing a new speaker, the tuning that made a cheap factory speaker sound mediocre will work against you, and make a great speaker sound only so-so. Factory audio system signal measurement and correction is now a way of life for a car audio installer.

Modern Vehicle Chassis Design

Did you know that automakers are now using aluminum panels in the construction of their vehicles? In the ongoing battle to reduce weight, the use of aluminum will continue to increase year after year. The downside for the mobile electronics enthusiast is that aluminum is not as good a conductor of electrical current as steel is. In fact, pound for pound, it offers 30% more resistance to the flow of electrical current. This dramatically affects the amount of current we can deliver to high-power audio amplifiers.

Worse than the fact that they are using aluminum is that they have also started using structural adhesives to bond panels together. Spot welds are quick, but they only connect a small area. A good bead of 3M, Loctite or Proform structural adhesive between two aluminum panels connects the entire overlapping surface of the panel together. There is less chance of movement and less chance of corrosion. There’s a downside to this as well: These structural adhesives do not conduct electricity.

If you work with experienced installers, they know how to deal with vehicles that have aluminum chassis and/or adhesive construction. Failure to compensate for these modern construction methods could result in damaged equipment and poor performance.

Choose Professional Installation

For most people, their vehicle is their second-most expensive purchase after their homes. When it comes time to have work done, the knowledge and experience of a trained professional can help ensure that you get all the performance you want from your purchase without any of the headaches of nonprofessional installation. Contact your local car audio specialist retailer today.

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.

There is no component more important to the sonic performance of your vehicle’s sound system than the car audio speakers you chose to install. You may own the best radio and amplifier in the world, but without great speakers, none of that great sound can get to your ears. Let’s look at why speakers are so important and a few suggestions on how to pick the best ones for your system.

Different Designs of Car Audio Speakers

Every car audio speaker is engineered to operate well within a specific range of frequencies. As a generalization, subwoofers are best at playing those frequencies below 80 Hz. Most midrange speakers can play from 80 Hz to 4 kHz, and tweeters typically play from 4 kHz and up. The size and weight of the speaker cone or diaphragm and the stiffness of the speaker’s suspension components (the spider and the surround) all affect the frequency response of the speaker. We need different-sized speakers to cover the entire audible range of audio.

For the speakers in your vehicle, you have two design choices – component or coaxial speakers. In a component speaker set, the midrange and tweeters are separate pieces. The midrange is often installed in the factory door or dash speaker location, while the tweeter is mounted high in the door, on the dash or in the A-pillars. This higher location helps make the sound appear to come from in front of you rather than from down by your legs. Coaxial car audio speakers still have two separate drivers. The tweeter is physically mounted to the midrange – typically, on a post that extends up through the center of the speaker. Coaxial speakers are easier to install, because there are only two pieces, not four. Both designs can sound very good, but typically, the best of the best speakers are designed as components.

A common trait among high-quality car audio speakers is high-quality passive crossover networks. Every tweeter needs some method of limiting what frequencies are being sent to it. In better systems, the output of the midrange that would normally overlap where the tweeter was playing is also filtered out. Passive crossovers can include tweeter level controls to help provide some basic system tuning.

Listen To This

Listening to speakers has been described as “personal preference” for decades. That being said, a speaker that is very accurate and free from distortion will always stand out from a speaker that has design issues. The best way to audition speakers is in a vehicle. Some companies put extra effort into the design of their speaker systems to make them sound better in a vehicle as compared to on a display board. Retail display boards have the benefit of letting you quickly compare the performance of several different models. Listening to both a demo vehicle and display can be the best solution for helping you pick a great set of speakers.

When you go to listen to speakers, bring your favorite music. It should be something that you have listened to many times on as many different sources as possible. Pick out and listen to different portions of the performance one at a time. If you are comparing speakers on a display, you can switch back and forth as you listen to different pieces of the performance.

Listen for vocals to sound natural. If there is too much high-frequency information, then S, T and P sounds will be over-emphasized. If there is an unwanted resonance in the midbass region (a very common problem with lower-quality speakers), then M and B sounds may be pronounced and sound unnatural. Some speakers sound nasally, some sound harsh. Either can be a sign of a distortion caused by the speaker design. Keep looking if you hear that.

Listen to high-frequency sounds like the ring of a cymbal or high-hat. It should have clarity and detail. Listen for the speed of transients – drums are a great test of a speaker’s ability to reproduce a wide range of frequencies while demonstrating smooth frequency response and lack of distortion. Drums should sound tight and controlled, with great definition.

Size Matters

When it comes to reproducing music, the size of your speakers has a dramatic effect on what you hear. A speaker with more area can move more air for a given amount of power – we refer to this as efficiency. The design of the speaker’s voice coil and the magnet structure also affects efficiency. In most cases, a larger speaker also produces more bass than a small speaker. This has to do with the weight of the speaker cone and the flexibility of the speaker’s suspension components.

Finally, how far the speaker cone can move will determine how loud the speaker can play. Don’t forget; you need amplifier power to move the speaker cone – don’t skimp on power.

Choosing Car Audio Speakers By The Numbers

One thing that an experienced car audio retailer rarely talks about is power handling. While this is important if you are looking for sheer system volume, power handling is in no way a quantifier of the quality of a speaker. There are speakers rated at 50 watts that sound exponentially better than speakers rated at 200 watts. Just as with amplifiers, manufacturers play many games when it comes to speaker power ratings. The only number that matters is the continuous power handling, sometimes referred to as RMS power handling. If you see a speaker with a CEA-2031 Power Rating, that is the best number to use. Max and peak power numbers start to make assumptions about the energy content of music, and it’s best to avoid assumptions. But don’t forget, power handling does not relate to sound quality in any way.

Drop in at your local specialist and have a listen to a few different car audio speakers in the appropriate size for your application and your price range. It may even help to make some notes as you listen. Your installer can offer suggestions like new wiring and sound deadening that can further improve the performance of your speakers once they are installed in your car. Don’t be afraid to ask questions and most importantly – have fun listening to your music! That’s what a great car audio system is all about!

This article is written and produced by the team at www.BestCarAudio.com. Reproduction or use of any kind is prohibited without the express written permission of 1sixty8 media.