Until now there are four major streams in the world of audio modification. Each has advantages both in terms of sound quality and in accordance with the budget owned by prospective buyers.
1. SPL Sound Pressure Level (SPL) is a modified flow that prioritizes large and tight bass sounds. This system requires only a small subwoofer, a maximum of two.
2. Sound Quality Loud (SQL) This flow is usually used by young children or lovers of modifications to the exhibition. In fact, not infrequently when they get together, modified community members express their creativity.
3. Sound Quality (SQ) SQ is an audio modification stream that prioritizes sound details. This system requires more devices so that the frequency, musical instrument tone, until the vowel is decomposed and heard in detail, clear and clear.
4. Car theater This car entertainment system is generally used by cars commonly used for the whole family. This flow uses a number of audio and video devices such as televisions, DVD players, head units, center speakers to support the surround system, and additional devices as desired.

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