In order to have a quality home theater system, the audio must be factored into the equation. This should be a factor when you're purchasing your new system. Let's look at the things for you to consider in order having a quality sound from your new system:

Decoding in Dolby Digital works well for soundtracks that have many channels that are produced that way. They are also on DVD, high-definition television and there are some satellites that accept this format. If you have VHS tapes or television shows that are in analog format that cannot accept Dolby Digital, it won't work. Instead, you will need either Dolby Pro Logic or Dolby Pro Logic II. These formats are universal sound decoders. The better format to choose is Dolby Pro Logic II.

Dolby Digital EX is good if you can have one or two extra speakers in the back. This format is an advanced version of Dolby Digital. This can also be used with other Dolby Digital soundtracks. DTS works like Dolby Digital. The downside is it's only used a substitute and doesn't have much value other than that.

The Dolby Pro Logic will work in any format. The sound comes from the left, middle, right and surround outputs. The best connection this will work well in is Dolby Surround soundtracks that are coded. If you don't have this or want to use something else, you can use Dolby Pro Logic II. Dolby Pro Logic II has more features than Dolby Pro Logic. This surround sound format works with CDs to generate a five channel surround sound. This option is a better one for surround decoding. Dolby Pro Logic IIx is capable of producing up to a 7.1 channel output. It's only useful if you have one or two back surround speakers with the left and right ones. If you can't do that, then there's not much use for this format.

The frequency response is important in a home theater audio system because it measures low to high levels. It also measures whether or not the frequency level is even. The important part about this is the low frequency level limit. If you have movies that are not action-based or science fiction, you can use a level of 50Hz, which is lower. Anything lower than 30Hz your body will be shaking. There are different type of audio inputs to use for your home theater audio system. The line-level stereo is an analog audio connection that can be used for stereo and Dolby Pro Logic formats. Coaxial digital is a digital audio connection that is needed Dolby Digital or DTS decoding. The input has to match the output. Optical digital is anther type of digital audio connection and the signal transmission has fiber-optic cable.

The loud sound comes from the power of the amplifier and speaker sensitivity. If the speakers are sensitive, they don't require a lot of power. If the speakers are less sensitive, they would need more power. The power for amplifiers don't cost a lot, so the amplifiers will rarely be without power.

Whatever format you choose, make sure it blends in with the system that will create the ultimate audio experience.