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Open Back vs. Closed Back Headphones

Open Back vs. Closed Back Headphones

When looking for a new pair of headphones, if you dig deep enough into your research you’re going to come across open back and closed back headphones (also referred to as the acoustic principle of a headphone). If you aren’t a headphone connoisseur you may wonder what the difference is between the two. The basic answer is that both are exactly what they sound like; a closed back headphone has fully enclosed ear cups to give you excellent noise isolation whereas open back headphones have open ear cups that allow sound to flow out into your surrounding environment (not exactly rocket science). Headphone drivers produce sound in two directions (toward your ears and away from them), closed-back headphones block the sound headed away from your ears while open-back headphones let that sound go out into the world.

Sennheiser Urbanite

Sennheiser Urbanite Closed-Back Headphones

There is, however, a little more to the open-back vs. closed-back headphone difference than just whether your headphones fully seal your ear or leave it open to the environment. Each design offers its own specific advantages and disadvantages and, if you’re looking for the perfect pair of headphones, it is important to understand the differences between the two as well as their intended applications.

Closed-Back Headphones

Closed-back headphones are the most commonly available headphone type, in part, because they are more versatile than their open-back counterparts. One of the primary advantages closed-back headphones offer is noise isolation. They’re designed to keep sounds from the surrounding environment out while not letting any of your music escape into the world.

Blue Mo-Fi Headphones

Blue Mo-Fi Closed-Back Headphones

From a sound perspective, there are some drawbacks to closed-back headphones. In general, closed-back headphones can limit the soundstage of your music. Basically, this means that they can make your music sound like it’s coming from a single point rather than spread out across a stage (also described as the music being “in your head” rather than all around you). Closed-back headphones typically offer fairly robust bass performance because of the fully enclosed chamber. They also allow you to really focus on the technical aspects of your music.
If you’re in the market for a pair of headphones for travelling, studying at the library, while at the office, hitting the gym or even working at a music studio, closed-back headphones are the way to go.


Sennheiser HD800

Sennheiser HD800 Open-Back Headphones

A pair of open-back headphones provides you with a completely different listening experience than a closed-back headphone. Open-back headphones feature grills or perforations on the earcups that allow air and sound to flow in and out of the headphones. Drawbacks of this design include anyone around you hearing your music and the ambient noise around you seeping into your music. As a result, you’re really only going to want to use them in quiet environments where you aren’t going to disturb anyone.
Because of their design, open-back headphones, as you’ve probably realized by now, are capable of producing a much wider sound stage than closed-back headphones. Open-back headphones generally offer much more realistic sounding audio because of the wider soundstage. This gives you a much more immersive listening experience and makes you feel like you’re at a show.

As a result of their open design and lack of isolation, open-back headphones are only recommended for using in your home or any quiet environment where you’re alone and not going to bother anyone. You won’t be able to fully enjoy open-back headphones in a noisy environment because your music will get so tainted by the ambient noise around you.

Choosing What’s Best for You

Nobody can tell you what the right style is for you, it all depends on your listening preference and what you’re planning to use it for. If you’re just looking to get lost in your music at home after a long day at work, a pair of open-back headphones might be the way you want to go. On the other hand, if you’re in the market for a pair of headphones at the office or for studying in a library, you’re probably going to want to pick up a pair of closed-back headphones.


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Bluetooth Speaker Buying Guide

Bluetooth Speakers

How much time do you spend listening to music, podcasts or the radio a day through your phone, tablet or computer? Regardless of where you spend most of your time, at home, at the office or anywhere else, chances are your answer is a lot. More often than not you’re probably using a pair of headphones to listen; but when you’re looking for a more social experience, whether you’re at a party, the beach or just relaxing at home, a Bluetooth speaker can be the perfect addition.

Because these speakers use Bluetooth streaming to play music you can carry your device around with you while streaming. They’re also compatible with common Bluetooth enabled devices, from Android smartphone to Apple iPads and everything in between. You should also be aware of what kind of Bluetooth the speaker you want has; if you’re looking for the best sounding speaker possible you’re going to want to pick up a Bluetooth speaker that supports aptX Hi-Fi streaming which gives you more detailed, less compressed audio quality.

What Are You Going to Use it For?

JBL Pulse Bluetooth Speaker

The JBL Pulse Brings the Party with You

Your first step in buying a new Bluetooth speaker, as with most purchases you make, is knowing what you want to use it for. Finding the right speaker to meet your needs is important, you won’t be satisfied with your purchase if you buy a speaker meant for use at the beach if you’re looking for something to fill your living room or office with high quality sound. At the same time, you don’t want to buy a home speaker if you’re intending to take it to the beach because chances are you’d end up ruining your speaker.

What Kind of Bluetooth Speakers Are There?

When you think of a Bluetooth speaker, a basic speaker that sits on a table in your house and plays music might be the only thing that comes to mind. It is important to understand that, whatever you plan on using a Bluetooth speaker for, there is a speaker tailored for your specific need.

Portable Bluetooth Speakers

JBL Micro Wireless Bluetooth Speakers

JBL Micro Wireless Bluetooth Speakers Go Anywhere with You!

The most versatile Bluetooth speaker is the portable Bluetooth speaker. Portable Bluetooth speakers can stream your music anywhere, from your home to the court to bring your favorite music with you. Portable Bluetooth speakers can range in size from small clip on speakers that you can attach to your bag or belt clip to larger speakers that are more meant for use in a single location. Because of their size, many portable Bluetooth speakers are ideal for travelers; they can be small enough to easily fit in your bags and powerful enough to really enjoy your music or movies in your hotel room. Portable Bluetooth speakers are commonly found as both stereo and mono speaker configurations to meet all of your audio requirements.

Limitless Creations Radiant Bluetooth Speakers

The Limitless Creation Radiant Bluetooth Home Speakers

Home Bluetooth Speakers

If you’re looking for wireless streaming but don’t need it to be portable, a home Bluetooth speaker is perfect for you. Home speakers and home speakers don’t run on batteries, they require a power connection. These speakers are great for anyone looking to add some high quality sound to their home audio experience. Bluetooth home speakers can be anything from a speaker that sits on a table or bookshelf to a full size floor standing speaker that provides full, room filling sound that is perfect for background music for entertaining or rocking out by yourself. Bluetooth home speakers are typically larger than their portable counterparts. They are also usually full-on stereo speakers and, in some cases, have built-in subwoofers to provide some extra kick to your music.
Outdoor Bluetooth Speakers

Outdoor Bluetooth Speakers

Bring Your Music Everywhere

One of the most popular, and desirable, applications for a Bluetooth speaker is using it outside. Outdoor Bluetooth speakers, which are usually portable speakers, are typically built with more rugged use in mind than your typical speaker. They almost exclusively feature, at the very least, some type of water resistance if not a full on waterproof rating. Outdoor speakers are perfect for using at the pool, taking to the beach, camping or any other outdoor activity that you want to inject some music into.

What Else Can a Bluetooth Speaker Do?

Once you’ve picked out what type of speaker best meets your needs you can start to pick out what kind of features you want. A Bluetooth speaker can be a versatile addition to your audio choices; they can be anything from a basic speaker just for playing music to a full-on complementary piece to your home sound system.

Mono vs. Stereo Speakers

To start, there are different speaker configurations available in Bluetooth speakers. If you’re just looking for something simple and aren’t too worried about sound quality, a mono speaker is probably the way to go. Mono speakers are typically portable and produce sound through a single speaker. A stereo speaker features two built-in speakers and is capable of much greater sound performance than a basic mono speaker. For optimum sound quality from your Bluetooth speaker, you’re going to want to pick up a 2.1 speaker. These speakers feature dual speakers with a built-in subwoofer to give the speaker significantly improved performance in the low end.

Hands-Free Phone Calls

Harman Kardon Esquire Bluetooth Speaker

Use Your Harman Kardon Esquire for Important Conference Calls

Many Bluetooth speakers are designed for more than just music streaming; they also can have built-in microphones for hands-free phone calls through the speaker itself. Bluetooth speakers with built-in mics are great for a variety of reasons. For starters, it’s just more convenient. If your phone rings while you’re listening you can take the call directly from the speaker (some even have built-in controls so you can answer the call by pressing a button on the speaker) rather than having to physically answer your phone.

NFC Pairing

Near Field Communication (NFC) is becoming increasingly more common and is an incredibly intuitive way to pair your devices. NFC enabled Bluetooth speakers eliminates the need to enter codes to connect your device and lets you pair your device (provided it’s also NFC enabled) by simply touching them together.

Companion Apps

Some manufacturers also offer a companion app with their Bluetooth speakers. You can download these apps onto your smartphone or tablet to get the most out of your music. These apps are usually available on both the Google Play store and iTunes. They usually include an equalizer as well as bass and treble controls to give you the ultimate control over your music you usually lack with your smartphone.

Bluetooth Speakers with Additional Inputs

Keep Your Device Charged While Streaming

Other Connections

Bluetooth speakers can also usually be used as wired speakers if you want to play music from a non-Bluetooth device. They often have a 3.5mm auxiliary input as well as a USB input that can, on select speakers, be used to charge your device. Select Bluetooth speakers also include 30-pin or Lightning connection docking stations that let you play music directly through the speaker with your compatible Apple device.

Bluetooth Speakers

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What Are Headphone Drivers?

exploded headphone view

It’s a well-known fact that not all headphones are created equally. Besides the obvious differences such as how they fit your ears, various features like Bluetooth and noise cancelling and even what their intended uses are, there are other more subtle differences that can make a huge difference in your sound quality. One such difference is driver type. Headphones are essentially a set of tiny speakers that sit in, on or around your ears and like all speakers, they have drivers.

What Are Headphone Drivers?

A driver is the part of the speaker which compresses and refines air to create sound waves. The drivers in a pair of headphones are generally considered the most important part of the headphones because they’re what make the sound you hear; the better the driver, the better the sound. Not all drivers are created equally however; there are several different types of headphone drivers that can have a dramatic impact on the performance and sound quality of a pair of headphones.

Dynamic Drivers

Dynamic Headphone Driver

Photo Credit: Head-Fi User GREQ

The most common driver type used in headphones is the Dynamic driver. Dynamic drivers, also known as the moving coil driver, are designed with a permanent magnet, usually neodymium, a voice coil and a conical diaphragm. A dynamic headphone driver looks pretty much identical to any typical home theater speaker. Dynamic driver headphones are capable of delivering a full range of sound with more than enough detail and clarity for the average listener.


Dynamic driver headphones will function perfectly fine without a headphone amplifier (although they usually will sound better with one) and can be found in everything from budget friendly earbuds to audiophile-grade over-ear headphones.

Balanced Armature Drivers

Balanced Armature Driver Diagram

Balanced armature drivers use basically the same components of a dynamic driver, magnets and voice coils to produce sound waves. How they function, however, is much different. A balanced armature driver uses a coil wrapped around an armature which is held in between two magnets until it is stimulated by an electrical current. When stimulated, this armature is magnetized which causes it to rotate one way or the other around a pivot point which moves the diaphragm to create sound. The strength of a balanced armature driver lies in the midrange, they tend to struggle reproducing frequencies below 20 Hz and higher than 16,000 Hz.

Balanced Armature X-Ray ViewHigher end balanced armature driver headphones often have multiple armature drivers which divide predetermined frequency ranges between them by utilizing a passive crossover network. As a general rule, the more balanced armature drivers a headphone contains, the better they can handle the low and high frequency ranges (but not always). Balanced armature drivers are generally used in in-ear earbuds because of their compact size and low impedances. Another benefit of the compact size of balanced armature drivers is that they are commonly used in hearing aids.

Electrostatic Drivers

electrostatic_driverElectrostatic drivers are generally only found in high end headphones (though not exclusively) because they require much higher voltages to operate. Electrostatic drivers are made up of an extremely thin membrane, usually a coated PET (Polyethylene terephthalate) film, stretched between two metal plates (electrodes). An electrical signal is applied to the metal plates to create an electrical field. The result of this electrical field is that, depending on its polarity, the speaker diaphragm is drawn toward one of the plates which forces air through the perforations in the diaphragm which generates the sound wave. Unlike dynamic and balanced armature drivers, electrostatic drivers have no moving metalwork.

Electrostatic drivers are much more sensitive and handle a significantly wider frequency range and produce hardly any distortion. Unfortunately, due to their higher voltage requirements, electrostatic driver headphones require a separate headphone amplifier.

Planar Magnetic Drivers

planar magnetic driverPlanar magnetic drivers, also known as orthodynamic drivers, operate in a similar fashion to electrostatic drivers. A planar magnetic driver is made up of a relatively large membrane suspended between two sets of oppositely aligned magnets. An electric charge is applied to the membrane to induce movement and produce sound waves. As a result of the entire membrane being equally charged and suspended within a uniform magnetic field, any changes in the electrical charge to the membrane causes movement in uniform across the entire membrane surface.

Planar magnetic driver headphones are known for having greatly reduced distortion levels as well as better bass response than other headphones because of the large surface area of the membrane producing the sound waves. In general, planar magnetic drivers are found in high-end, audiophile-grade headphones. Another thing to be aware of, while planar magnetic drivers don’t require as much power as electrostatic drivers, they still generally need to be used with a headphone amplifier.

Other Drivers

There are other types of headphone drivers available, but they are used much less commonly and typically only for specially designed headphones. These include technologies like the Heil Air Motion Transformer driver, Ribbon Planar Magnetic driver and Magnetrostriction headphones (sometimes referred to as ‘Bonephones’).

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What are Crossovers?


Believe it or not, there is a lot more that can go into a sound system than a headunit, speakers, subwoofer and amplifier. One such piece is a crossover. A crossover’s basic function is to take a single signal and split it up into multiple signals of specific frequency bands, low range, mid-range and high range frequencies. In a car audio system, the crossover then sends those frequency bands to the correct speaker (low frequencies to your subwoofer, mid-range to your speakers and high range to your tweeters).

Speakers Crossover Network

Without a crossover your system would waste a significant amount of energy trying to play frequencies it isn’t designed for, your subwoofer will be trying to play notes intended for your tweeters and vice-versa. This results in poor overall sound quality and can also be potentially hazardous to your system. Because of this, nearly every sound system will have some kind of crossover built-in.

Now, as with all other aspects of your car’s sound system, your system can get by with its existing crossover, but if you want your system to truly reach its potential you’re going to need to add an aftermarket crossover.

Active vs Passive: What’s the difference?

There are 2 types of crossovers you can have in your system, an active crossover or a passive crossover. Passive crossovers don’t need a direct power source to filter signals while active crossovers need power and ground connections. The type of crossover you want really comes down to one thing, how much control do you want over your listending experience?

Passive Crossover:

Passive crossovers are unpowered and use capacitors and inductor coils to separate the sound frequencies for your system. A good example of a passive crossover is the crossovers that come with a component speaker system. Passive crossovers are wired in-line between the speakers in your system and the amplifier (or source). The passive crossovers that come with your component system come tuned and ready to be installed. One drawback of these crossovers is that because they are located after the amplifier, they waste power filtering a signal that has already been amplified.

Another form of a passive crossover is the in-line crossover. An in-line crossover can come in a few different forms. One can essentially look like a AA battery with an RCA connection on either side and connects to your amplifier’s RCA inputs. Other in-line crossovers will protect your speakers from unwanted frequencies when used after the amplifier by separating the frequencies before they reach the driver.

The biggest tradeoff with a passive crossover is ease of installation while sacrificing some flexibility in your system with the loss of sound customization.

Active Crossover:

Unlike passive crossovers, an active crossover requires a direct power source. Active crossovers are installed between your receiver and amplifier. As a result of this, active crossovers filter your frequencies before they reach your amplifier which means there is no wasted energy filtering amplified signals. Active crossovers also usually feature a variety of adjustments, including gain controls, low pass and high pass filters while select active crossovers feature built-in equalizers to give you the ultimate control over your system.

The only real disadvantage to an active crossover is the installation. Since an active crossover has to have a power, ground and turn-on connection it has the potential to complicate your install more than a passive crossover. However, if you’re interested in making your system really sing, an active crossover is a must-add piece.

Crossovers at Sonic Electronix

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What is a Bluetooth Amplifier


One of the best perks of constantly evolving technology is the new products that hit the market every year. While Bluetooth amplifiers aren’t technically new, RE Audio released the BT900.4 Bluetooth amp about a year ago, they are becoming increasingly more common with Cerwin Vega, Infinity, JBL and Kicker releasing their own Bluetooth amps with more sure to hit the market soon.

If you drive an older car, chances are you probably don’t have Bluetooth. A Bluetooth amp is perfect for you if you aren’t interested in taking out your factory stereo to add an aftermarket stereo with Bluetooth. Not only will you add Bluetooth to your vehicle, you’ll be able to amplify your speakers and improve the overall performance of your system.

Why You Want One

  • Stream Music Through Your System Directly from Your Amplifier
  • Eliminate the Need of an Expensive Head Unit
  • Amplify Your System

How Bluetooth Amplifiers Works

Bluetooth Amplifier Diagram

A Bluetooth amplifier is actually a pretty basic piece of equipment. It functions and installs just like any other amplifier would (they can be connected to a source unit, but it isn’t required), it just has an integrated Bluetooth module installed in it allowing you to connect virtually any Bluetooth enabled device (smartphones, tablets, etc.) to it wirelessly. Bluetooth amps eliminate the need of a traditional head unit because they allow the amp to double as the receiver.

Kicker PXiBT50.2

Common Applications

One of the things that makes a Bluetooth amplifier great is the flexibility it provides you with. While a Bluetooth amplifier will make an excellent addition your car’s sound system, they are also a perfect fit for marine and power sports use, as well as just about any other application that requires an amplifier.

In the Car

A Bluetooth amplifier adds another, and perhaps the most efficient way to add Bluetooth to your car. Many older stereos don’t have built-in Bluetooth simply because it wasn’t a common feature. Until the release of Bluetooth amplifiers the only way to add Bluetooth to your vehicle was through a new, potentially costly, Bluetooth headunit or a Bluetooth adapter that was compatible with your stereo. With a Bluetooth amp you can knock out two birds with one stone. You’ll add the convenience of wireless Bluetooth streaming to your car while also amplifying your existing system. Some Bluetooth amps also include a wired microphone, enabling hands-free phone calls.

On the Boat

Bluetooth amplifiers aren’t just for use in your car, they’re also a great for streaming music out on the lake. Many boats don’t even have a sound system installed, so if you want to add a system you’re probably going to need to build it from the ground up. A marine rated Bluetooth amplifier allows you to skip over a head unit all together, saving you money while improving the performance of the rest of the system. And much like in your car if your boat does have a sound system and the head unit isn’t Bluetooth enabled, a Bluetooth amplifier can save you from having to change out the stereo.

On the ATV

For anyone interested in outdoor power sports, you know that free space is incredibly limited. Installing a sound system in an ATV, UTV, SSV or motorcycle can be a tricky proposition because of this and anything you can do to save space can be invaluable. A Bluetooth amp can consolidate your source unit and amplifier into one piece of equipment without sacrificing the ability to actually play music through your system.

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Car Audio 101: Car Amplifiers

An amplifier is really a simple piece of your aftermarket sound system. A car amplifier basically amplifies a signal from a source (in the case of a car sound system, your stereo) to a much greater signal. Signals from source units are typically fairly low voltage, which is fine for most speakers (but not subwoofers), amplifying your speakers will make them perform to their full potential. Now, your speakers can be powered by just your source unit, but a subwoofer will require an amplifier. Giving your system more power will improve both sound quality and how loud your system will play.

When looking for an amplifier, it’s important to know what you intend to use it for. If you’re simply adding a subwoofer to your system you will only need a monoblock amp while with a complete system (4 speakers and a subwoofer) your best bet is either a 4 channel and a monoblock or a 5 channel amplifier. It is critical to the success of your sound system that you match up all of your equipment (speakers, subwoofer, source unit) with the right amplifier to make sure everything is powered properly to give you the best sound possible.

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Car Audio 101: Car Speakers

After upgrading to an aftermarket car stereo, your next move is to upgrade your factory speakers. Factory speakers are made from cheap, flimsy materials and are not designed for quality sound reproduction. Because of their low quality construction, factory speakers don’t tend to last very long. Factory speakers also do not always have a tweeter. Without a tweeter, your factory speakers will struggle to reproduce the highs in your music which results in mediocre (at best) sound quality. Aftermarket speakers on the other hand are built from much higher quality materials and feature a much more efficient design. These allow aftermarket speakers to offer greater power handling capabilities, overall sound quality as well as a greatly improved lifespan over your old factory speakers.

To go along with their better overall design and construction, aftermarket speakers also include a tweeter. Aftermarket speakers are most commonly available in either component or coaxial design. A coaxial speaker has the tweeter built into the frame of the speaker whereas with a component speaker the tweeter is a separate unit. Component speakers also include an external crossover network. Because component speakers have the tweeter as a separate unit, you can install the tweeter in a separate location from the speaker which allows for better overall sound quality.

Before you buy a set of aftermarket speakers, it is important to look in your car to see what kind of setup your car is configured for. Different cars come with different sound systems, different speakers types and even different speaker sizes.

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Car Audio 101: Car Subwoofers

Adding an aftermarket stereo and speaker set to your vehicle’s sound system will have you on your way to the perfect setup, but speakers alone won’t be able to reach the deep lows in your music. Without this bass, you will never truly experience your music. Adding a car subwoofer to your system is the perfect remedy to this problem because they are designed specifically to reproduce the low frequencies recorded in your music. When looking for a subwoofer, its important to know that you don’t have to have a subwoofer that makes your entire car shake, you can get subwoofers intended for more subtle bass.

Unlike aftermarket speakers and headunits, a car subwoofer requires a bit more than simply plugging it in and going. Car subwoofers also require an amplifier, an amplifier wiring kit and a subwoofer enclosure that matches up with the subwoofer. With enclosures, you need to know how much space you have available in your car as they can be fairly large and take up quite a bit of space. Subwoofers are traditionally available in sizes from 6″ up to 18″ to fit a variety of needs and preferences. However, 10″, 12″, and 15″ subwoofers are the most popular sizes.

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Car Audio 101: Car Stereos

The first step to upgrading your car audio system is generally installing an aftermarket stereo. Your stereo is the center point of your sound system and a low quality receiver will leave the rest of your system lacking, no matter how great it is. The stereo’s job in your sound system is to send signal to your speakers (or amplifier if you have one). A low quality factory receiver will send dirty, distorted signals to your speakers which will result in poor sound quality. A new stereo by itself can make even basic factory setups sound significantly better.

A huge improvement in sound quality won’t be the only upgrade you’ll get from an aftermarket stereo. You will also be able to add a ton of new and improved features over your old factory stereo like an improved equalizer, smartphone integration, built-in GPS navigation and more. While your factory radio may support features like this, they are often much more limited than what an aftermarket radio is capable of. For newer vehicles that come with factory steering wheel controls and backup cameras, you will be able to find an adapter to integrate them into an aftermarket stereo.

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Car Audio 101

Welcome to Car Audio 101 with Sonic Electronix! This series will cover everything you need to know about car audio, from the absolute basics for beginners to the more technical aspects of car audio. From your basic aspects of a car stereo, your amplifiers, speakers, headunits and subwoofers, to digging deep into things like tuning frequencies and battery isolators. Follow our Car Audio 101 videos and you’ll be an expert in no time!

Car Stereos

When you’re ready to start upgrading your car audio system, one of your first steps should be upgrading your factory stereo. Upgrading your car stereo can drastically improve the sound quality of your system while also adding a ton of new features (better EQ, extra outputs, Bluetooth etc.). Your stereo is responsible for sending signals to your speakers (or amplifier if you have one), and a low quality stereo is going to send a bad signal to your speakers, resulting in poor sound quality.

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Car Speakers

After upgrading your factory stereo to an aftermarket unit, your next step is typically upgrading your factory speakers. For starters, factory speakers are made from very cheap, flimsy material and usually don’t come with tweeters. Aftermarket speakers are made from significantly higher quality materials and also come with tweeters (either mounted to the speaker or as a separate unit). A set of aftermarket speakers will handle more power, last a lot longer and sound better than your cheap factory speakers.

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Car Subwoofers

Adding a subwoofer to your car can completely transform your sound system. Depending on your listening preferences, you can add a lot of bass or something a little more subtle. Without a subwoofer integrated with your system, you will actually be missing out a big chunk of the sound frequencies recorded into your music. Your basic car audio setup without a subwoofer simply isn’t able to reach those low notes in your music. Adding a subwoofer to your system isn’t as simple as buying a subwoofer and plugging it in, subwoofers also require an enclosure (usually either ported or sealed) and an amplifier.

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Car Amplifiers

What does an amplifier do? Well, it basically takes the signal from your car stereo and amplifies it to a much greater signal before it gets to your speakers. An amplifier will bring out the full potential in your speakers. If you’re looking to add a subwoofer you’ll have to add an amplifier because your stereo doesn’t have enough juice to power one. You’ll also need an amplifier installation kit to get your amplifier up and running.

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