Sound system & audio (meetinghouses)/pt
All content on this page is moving to LDS Help Center under the Meetinghouse Technology topic. This page was supposed to be deleted at the end of October 2012.
Note: While buildings vary in how the sound system is implemented, the instructions should cover the typical case.
Multiple input adapter box (aka audio interconnect box or "crab box")
The multiple input adapter box has a variety of cables and connections allowing one to connect most any electronic audio source (VCR, DVD, CD, MP3 player, laptop computer, mixer, etc) to the XLR mic-level input of the typical chapel or cultural hall. Due to its many cables, the box is sometimes referred to as a "crab box." Typically a crab box is either a model EJ-10 (gray case) or EJ-8 (black case).
The crab box requires a higher level output such as Line, Speaker or Headphone. It cannot work with mic-level sources.
The EJ-10 has the ability to connect to the phone line on the left side of the box - either to feed audio to a remote site or to receive audio. Some examples of this use is to use as a backup to hear priesthood session of General Conference if the satellite broadcast should fail, or use a pair of them as backup to the Meetinghouse Webcast system.
The EJ-8 lacks any telephone features but has been observed to allow the sound to be louder. This may be useful in some situations such as playing a DVD with soft audio. In older systems which do not have a line level input into the system, the EJ-8, and EJ-10 allow the connection of any non- Mic level signal into the building sound system.
The Church issues at least one audio interconnect box to a building. The box is usually stored in the library.
The Presiding Bishopric has approved the use of wireless microphones in LDS stake centers. New and retrofitted sound systems being installed will begin to have one portable UHF wireless microphone system provided with the sound system. This one microphone is provided and cared for by the FM group.
Additional wireless microphones are available for purchase by the stake through Distribution Services. The wireless microphones distributed by Church headquarters are the only ones officially supported.
Some buildings use interpretation equipment, that makes it easier for members of the congregation who speak a different language to hear an interpreter. In this scenario, an interpreter simulcasts sacrament meeting to members in the chapel who will be wearing special headphones.
In most stakes, such equipment is handled by the local FM Group and they are the ones to purchase and provide the items to us. Often the transmitter and receivers are from Williams Sound (http://www.williamssound.com/home.aspx). One stake reported that the transmitter was model T17. Sometimes there is also a hush microphone (like a court reporter uses).
Use for broadcasts
The interpretation equipment can be used along with a crab box to transmit the alternate language channel of a broadcast so that everyone can sit in the chapel during the session. This may help non-English speaking members feel better about coming to the broadcasts. Without this, they may be sequestered in a room with a television away from the rest of the group.
Hint: If your A/V closet doesn't have an audio output for the alternate language, you may be able to use a VCR tuned to the appropriate channel and use the audio signal from the VCR's audio output which you connect to the crab box or transmitter.