Kicker Comprot Cwrt672 Free Air Installation Manual
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Best Buy has honest and unbiased customer reviews for KICKER - CompRT 12' Dual-Voice-Coil 4-Ohm Loaded Subwoofer Enclosure - Black. Read helpful reviews from our customers. Warranty Information. Package Includes: (1) Kicker 48TCWRT672 CompRT 6.75' 300w Slim Car Subwoofer+Sub Enclosure COMPRT12. (1) Rockville dB11 1400 Watt Peak/350 Watt Dyno-Certified RMS Mono 2-Ohm Amplifier Car Amp+Bass Remote. (1) Rockville RWK81 8 Gauge Complete Amp Installation Wire Kit with 100% Copper RCA.

Introduction to Enclosures

When it comes to selecting an enclosure type to get the best sound from your woofer and matching it to your taste in music, it can be a little confusing. The purpose of an enclosure is to improve bass response and prevent woofer damage from over-excursion. There are a few things you will need to consider before making your final selection that will ultimately affect your choice in subwoofer enclosure style. Here are some of the key points you will need to consider:

How much room is available in your vehicle and how much are you willing to sacrifice.
What type of speaker will you be using? Some speakers are designed for specific enclosure types. (refer to the manufacturer’s recommendations)
How much power does the amplifier produce and what type of crossovers and controls does it have?
What type of music do you listen to? Different enclosure styles will sound slightly different.

Once you have determined the above conditions, you will then be able to make a choice that will get the best bass response. The next sections will outline the most popular types of enclosures to help you make a selection that is right for your listening tastes.

Infinite Baffle

Simple infinite baffle mounting board:

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Infinite baffle example:

Infinite baffle frequency response curve:

An infinite baffle is not necessarily an enclosure. It can be as simple as a board or mounting surface (called a “baffle”). This can be a flat board with the woofers mounted to it and then attached to back of the seat of a sedan. Another example of infinite baffle is how speakers are mounted in the rear package trays of most sedans. The speakers have no enclosure and the speakers are mounted facing up in the package tray. Many vehicles have subwoofers mounted in the rear package tray infinite baffle right next to the full range speakers. With this type of mounting, the trunk is typically used as the “enclosure”.

Infinite baffle mounting is often considered the best overall sounding of all the examples we are going to talk about. They do not have an enclosure that will change the way the woofer naturally sounds. Since they don’t have an enclosure they will not take up as much room in the vehicle and can be mounted (in some applications) where they may not even be seen as at all.

It’s important to note, infinite baffle does have some limitations.

When mounting woofers in an infinite baffle configuration, you must have a woofer that is capable of operating in an infinite baffle or ported enclosure. You will need to make sure that you seal the mounting baffle as good as possible to the vehicle so that the sound waves from the rear of the speaker cannot reach the front of the speaker to cause cancellation. Remember that bass can travel through anything that is not solid such as the rear seat foam and even other speakers that are mounted near the woofers. Any areas not sealed between the front and rear of the baffle will decrease the amount of bass. An ideal infinite baffle mounting can be a challenge due to the potential difficulty of sealing off the front and rear of the baffle.

Also, since they don’t have an enclosure, there is nothing but the suspension of the woofer to control cone movement. That is why it is important to have an amplifier which has a subsonic filter to eliminate any damaging frequencies reaching the subwoofer. Infinite baffle mounting does limit the total output of the woofer and its power handling. That is why it is best to use a woofer specifically designed for this type of mounting configuration. You also have to make sure you have properly isolated the front and rear pressure waves with the baffle or you will have limited output and bass response.

Pros

Easy to construct
Smooth frequency response
Does not take up much room in trunk
Uses speakers’ natural frequency roll-off

Cons

Limited power handling
Limited output
Require specific crossover capabilities from amplifier for best results.
Rear side of the driver is exposed along with the wiring and it may not be a clean looking installation

Sealed enclosures

Simple sealed enclosure:

Simple sealed enclosure with internal cabinet bracing:

Sealed enclosure example:

Sealed enclosure frequency response curve:

Violet - large sealed enclosure
Green - small sealed enclosure

A sealed enclosure has a “closed” airspace. They are usually built within a range of internal volume specified from the manufacturer. The internal volume will vary depending on the type of sound you are trying to achieve. Sealed enclosures can have large or small internal volumes with no ports or vents in the enclosure. The air inside the enclosure works as an air spring to control cone movement. They are sometimes called “acoustic suspension” enclosures.

When choosing the proper volume of sealed enclosure for you tastes, you will need to consider the following: A large sealed enclosure will have a smoother output with deeper bass but may also limit power handling because woofer cone has less control at lower frequencies. Too much power at lower frequencies can damage the speaker’s suspension components (surround, spider, tinsel leads, or voice coil former). You must make sure that your amplifier does not produce more power than the woofers is rated to handle in this size of enclosure. This type of enclosure is usually used when you are trying to reproduce music very accurately at a moderate volume. Sealed enclosures are one of the most popular box designs for someone that is looking for very accurate sound reproduction.

Sealed enclosures are usually used when you want loud music reproduction with very good cone control. For example, small sealed boxes are often designed for the older rock, hard rock, or speed metal. These genres of music usually have a good amount of drums in the recording and do not have a lot of very deep bass information in the recordings.

With a small sealed enclosure, the bass will be very “tight” and controlled. The woofer will handle a large amount of power because the enclosure will limit the cone movement at the lower frequencies which could damage the speaker. The smaller sealed enclosure will give you a little more output, or “bump” as it is called, before it rolls off but will start rolling off bass response at a higher frequency than a larger sealed enclosure.

Larger sealed enclosures will play lower bass and are considered to be a bit smoother in frequency response because they have a little less “bump” before they roll off in output. They will not have as much of the punch as a smaller sealed enclosure but will play lower bass overall. They will also take up more space in the vehicle since they require more air volume. They can reproduce low bass response that is very smooth and natural sounding.

The lower bass response in a sealed enclosure will roll off at a rate of 12 dB/octave. This is a smooth gradual roll off that gives them a very good response curve and will not have an excessive peaks in output at certain frequencies.

Pros

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