Improving your car audio sound quality can reduce the need for a costly upgrade of the entire system. Replacing an individual component can often increase the quality by itself. In addition, adding a powered amplifier to an existing factory system can more than double the output, sound-deadening material can make your current speakers louder and clearer, and a subwoofer will increase bass performance.
Tip #1: Upgrading all your car speakers,to better speakers and make sure there not paper cone!.Like some jbl gto series
components.Components means that there is a separate tweeter and a separate speaker.So you have a choice on were you want to mount the tweeter.Also for the back i suggest getting some 6×9 fitted into your parcel shelf.If you don't want to make a mess and drill holes, then get some 6×9 pre made boxes and place them near your rear seats.Car Speaker Buying Guide
Tip #2: Select a lower level of compression for your music files.
Yes, you can store more music files in your MP3 player with more compression, and they'll sound OK when you're listening through earbuds. But you lose some high- and low-frequency information when you compress your music, along with some of the details that make your music interesting. And, on a good car audio system, you can really tell that something's missing. Don't settle for the default setting when creating your files. If you want to use your iPod or MP3 player in your car, try using as little compression as possible. The higher the bit rate, the better your music will sound through your car's system.How to connect MP3 player to car stereo
Tip #3: Bypass your iPod's built-in digital-to-analog converter.
A digital-to-analog converter, or DAC, has the job of converting digital information — 0's and 1's — into analog music signals. The iPod's built-in DAC usually does a good enough job for casual listening with earbud headphones, but it doesn't deliver the same level of performance you can get from the more advanced DACs found in many of today's better car stereos. Fortunately, if you can connect your iPod to your aftermarket stereo via a USB cable, you might be able bypass your iPod's DAC. It depends on the individual stereo, so be sure to check the stereo's "Hands-on Research" info on the Crutchfield website for confirmation.How to Connect iPod to Car Stereo
Tip #4: Use Dynamat or another sound deadening material.
Insert sound deadening material inside the doors and back stereo casings to make the stereo louder and clearer by filtering out background noise. Open the inside panels of the car door and stuff store-bought sound proofing into the empty spaces, and then replace the panel. Soundproof the back stereo casing by placing stuffing around the underside of the speakers. Not only will this improve volume and clarity, it can also make the car quieter when in use. 
Tip #5: Add an amplifier.
Add a small, standard car-sized power amplifier to make the car audio much louder. Factory stereos rely on small, integrated power amplifiers to power all the speakers in the car. Powered amplifiers, which are bolted to the trunk floor or under the seats, pull power from the car's battery and push it through the system. This makes the speakers work overtime. Because it takes a lot to overpower a speaker, any standard power amplifier will work fine with the factory speakers in cars.How To Set Up A Car Amplifier
Tip #6: Add a signal processor or an equalizer.
To maximize the sound quality of your car’s music system, you can add an equalizer or a signal processor. Plastic and glass surfaces reflect sound like wild, while seat covers, carpets and other porous materials infuse it up. You can find noteworthy crests in frequency response in most of the car interiors after including poorly placed speakers. These make your music bang in the shrill or bass in the higher frequencies which may even cause ear fatigue.Use of signal processor or equalizer can destroy these peaks. You will find multiple options in an outboard equalizer to adjust the frequency responses which can clear up the high peaks in your stereo system. A parametric equalizer lets you to change the width and center-point of each EQ band. The sound processors on the other hand can increase bass response thus eliminating the frequency response peaks.
Tip #7: Build a better sub box. Or buy one.
If you're building a sealed box, make sure it's sealed properly. Air leaks can really hurt your sub's performance. If you're using a ported box, make sure you've got the right sub in there. You can destroy a sub that's designed for sealed box use by driving it hard in a ported enclosure. Also, it's important to build a box with the correct interior volume for the sub you've picked out. A mismatch can result in poor performance or a sub fatality.Car Subwoofer buying guide
Tip #8: Your crossover can really improve the sound of your system.
In many dash boards, now you can get frequency filters that control the outputs. For removing the bass from full volume, use high pass filters. They can help you get clear volume. Connect them to receiver`s power. The associated sound may be strong but you will hear a sound from your back it is the bass sound. You can adjust the bass up and down with you music just by changing the cross over points of the filters with low pass. 
Tip #9: Set your amp gains properly.
Our Tech Support people field calls every day from customers who can't understand why their new car audio system sounds so bad. The #1 problem? Most people think the gain control on their new amplifier controls the volume level. Naturally, they turn it all the way up and then bad things happen. The gain control actually adjusts the amount of input signal coming into the amplifier. Crank it up too high, you'll hear some nasty distortion. The general idea is to turn your receiver's volume control roughly 3/4 of the way up to maximum volume, then turn up your amp gain until you hear distortion. Back it off a little, and you're all set. Every amp manufacturer will have specific suggestions, so you'll want to check out your manual for the best way to set the gain on your new amplifier.
Tip #10: Don't max out your tone controls.
Boosting your factory radio's tone controls up to 11 might make your system sound better sitting in your driveway, but it just creates distortion when you turn it up on the highway. A heavy low-frequency boost, in particular, will put a big strain on your factory system. If you want to fatten up your sound, try using a smaller boost in the bass, lower the highs and mids a touch, and then turn up your overall level a little more. But maybe you've replaced your factory radio with an aftermarket stereo that features a multi-band equalizer. The rule still holds true — you should avoid excessive tone boosts or cuts if possible. A bad EQ setting can make a good system sound terrible, while an intelligent tone curve can make a good system sound great.
It's a bad idea to fool with your EQ on the road. If you can, program a few different EQ presets into your receiver, so you can see what works best in your car without having to adjust settings while you're driving. Or cycle through your receiver's preset curves to see if one of them sounds particularly good at highway speed, then customize that setting in your driveway.
Tip #11: Add a sub and hear what you've been missing.
I've installed a lot of car audio systems, and I still love to see that "Wow" moment when somebody hears a sub in their car for the first time. A good subwoofer will bring the bottom octave of your music back into proper balance, so you'll hear familiar tunes in a whole new light. It'll take a load off your full-range speakers too, since you'll be playing your tunes with the bass control set at "0" instead of "+5". Some people get turned off by subs throbbing next to them at traffic lights, but it's not just about the boom — you can adjust any subwoofer to fit your tastes and your vehicle. And once you drive with a subwoofer, you can never go back to living without one. Or two.
Tip #12: Use a capacitor if you're going to push your subs hard.
They didn't have subwoofers in mind when they built your vehicle. Big bass sucks up a lot of power, and most car electrical systems aren't equipped to deal with it. A capacitor acts as a buffer between your amps and your car's battery. You connect the cap inline on the power cable from your battery, as close to the amp location as possible. It stores up power from your battery, then releases it instantly to satisfy your amp's demand for the power needed to reproduce a big bass hit. Maybe you notice a big drop in performance after you run your subs loud for a minute or two? Or do you see your headlights dimming in time to the music at night? A cap cures these problems by taking the brunt of those demand peaks from your amp, so your amp sees a more consistent supply of power.
Tip #13:Getting a better headunit or a cd player know to others will help get the most of your car audio system.
A headunit is something that controls everything in your that is car audio related .Some newer headunits have built in 5 band equalizers,so you have a better control,controlling all the frequencies and bands.My advice is getting a headunit with gold plated rca jacks on the back.This stop buzzing noises from your subs as gold is a better signal conductor.Try to find a decent headunit,there are many makes and models,but do not go for the Sony Xplod series,there cheap and they break down often if you wanting to buy a good car deck .I recommend two affordable brands that make car stereos and are Pioneer and Allpine,because them two cheap car radios give good sq for money.How to install a CD player in my car
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