Acoustic Information
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- Bob 413-374-8000
- Rich 413-374-8300
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STC (Sound Transmission Criteria) values are used in many commercial office buildings and should not be used to measure transmission loss in home theaters. STC has a limited frequency range and does not cover the lower subwoofer range of frequencies. So you might build walls with a good STC rating but that explosion in the movie you are watching still transmits throughout your home. STC is a good measurement for office areas where you don't want conversations heard in the next room but not for home theater.
A good example is cars. Has someone ever driven by you and all you can hear is boom, boom, boom bass coming from it and no music? Cars will often have very high STC values and that is why you do not hear the music, inside the car they are hearing the music just fine. This is what you'll hear in other areas of your house if you try to build your theater using STC.
You recommend two or more subwoofers, why?
In small rooms less than 50' x 50' standing waves are going to exist in the room. These waves have peaks and nulls. If you are sitting in a peak the bass will be loud and boomy, if you are sitting in a null the bass is lacking and almost non existent. First we try to put your seating in an area where this effect is not exaggerated. Secondly, we place the subwoofer(s) so the difference between the peaks and nulls is minimized.
Often, the best placement for one subwoofer is somewhere into the middle of the room. This is often not an acceptable location for the subwoofer. With two or more subwoofers we are able to get the subwoofers near the wall using their interaction to achieve the same effect. Secondly the additional subs will provide greater headroom for dynamic material.
Contact Information
Please feel free to contact us. We are normally available seven days a week between 8AM-8PM. Do leave a message as we answer them promptly.
- Bob (413) 374-8000,
bob@a-v-tech.com
Rich (413) 374-8300, rich@a-v-tech.com - FAX:
- 801-305-8000
- Postal address:
- AV Tech
- 205 Barry Street
- Feeding Hills, Ma 01030
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