68 Applications for Schools
10 Items Per Page
Distribute Three Audio Sources to Multiple Locations Over UTP Cable
AN-2220
Description
Three styles of music are distributed to various rooms in this facility over CAT 5 cable by an RU‑TPS4A Format‑A Active Sender / Distributor. A D Series‑TPRX3A Source Selector and D Series‑PA3 Audio Amplifier installed in each room allow the occupants to listen to any of the three types of music provided or to listen to their own program material simply by plugging their MP3 player into the front‑panel input on the D‑PA3 amplifier. The front‑panel local input overrides the distributed audio.
BGM and Paging Audio Transmitted Between Buildings Over Existing Network
AN-2228
Description
Danteâ„¢ networked audio is ideal for audio systems with large channel counts and is equally beneficial in much smaller systems. Cost savings can result from utilizing Dante to transport one to four channels of audio over an existing Local Area Network which would otherwise require the installation of dedicated audio cable between buildings in a school, hospital, church, office complex or factory. This diagram shows background music and a paging microphone sent via Format‑A directly to a local Mixer‑Amplifier in the main building. The Format‑A cabling also sends these sources to the RU‑FNP Format‑A to Network Interface which converts the two sources to two Dante network channels. The signals travel through the network to the satellite building(s) where they are converted back to audio by the FP‑NML2 Network to Mic/Line Interface to feed the BGM and Paging inputs of a Mixer‑Amplifier.
Full-Featured "Green" Amplifier Saves Energy and Reduces Operating Costs
AN-2130
Description
The wall‑mounted D‑RC3M allows full remote‑controlled mixing and muting of the audio sources. Computer, DVD/VCR and wireless microphone sources are connected through RDL wall plates permitting energy‑saving passive CAT5/6 and monitor cable interconnection to the amplifier and projector. Video sources are selected by the projector. The HD‑RA35UA drives 70V constant voltage speakers (or 25V if preferred or required by local code) for placement of multiple speakers for optimal audio coverage. The only active RDL component is the HD‑RA35UA Mixer Amplifier which “powers up†as soon as it detects audio. When the system remains inactive (no audio in use), the HD‑RA35UA enters the sleep mode, consuming less than one watt for optimum energy conservation. The HD‑RA35UA returns to active mode (turns on) automatically when an audio input becomes present.
Common Paging for Multi-Story Office Building
AN-2108
Description
Installed UTP (unshielded CAT5, CAT6 or similar) cable can be used to distribute facility‑wide paging to multiple floors or zones. The facility paging source for this multiple story building is fed to the RDL TX‑TPS1A Active Single Pair Sender. Its output is fed to a twisted pair receiver on one floor, then in turn to additional receivers on the other floors. All connections use UTP terminated with RJ45 plugs. A TX‑TPR1A Active Single Pair Receiver on each floor delivers line‑level paging audio to the local amplifier. Each Format A twisted pair receiver bridges the UTP cable, allowing the source signal to continue on to multiple receivers. The receivers are powered from the TX‑TPS1A sender. (Note: If the total distances between the receivers exceeds the recommended cable length for the cable type used, one or more additional power supplies may be required. If needed, an additional power supply may be connected to any of the receiver modules. Consult the Format‑A twisted pair data, or RDL technical support for more information.)
RFI Suppressed on Six Signal Conductors
AN-2177
Description
The ST‑FS6 Ferrite Suppressor / RF Filter is used to attenuate excessive RF interference (RFI) induced in the wiring conductors by a nearby communications tower. The passive ST‑FS6 provides six isolated channels of highly effective ferrite RF suppression without capacitance to ground or series resistance. Two ground terminals are provided to be used as tie points for connecting cable shields (not pictured). The ground lugs have no internal connection to the suppression circuitry. Each of the six I/O terminals may be used independently for the suppression of RF on Audio, dc power or logic control signal conductors. RF interference on audio and control wiring causes unwanted audio noise or instability in control circuits. The ST‑FS6 is normally installed at the rack where signals are received. It is possible that interference may interfere with audio or control sending equipment, making it beneficial to install a suppressor module at both ends of the long interconnection lines.
35 Watt Mixer Amplifier Powers Portable Classroom Audio System
AN-2131
Description
This portable system provides robust amplification for portable speakers from multiple audio sources. Audio levels from a laptop computer, CD player and instructor's microphone can be independently adjusted on the HD‑MA35U, which also provides tone control to optimize audio for the room. The only active RDL component is the HD‑MA35U which powers up when audio is detected. When the system is inactive (no audio in use) it enters the sleep mode, consuming less than one watt for optimum energy conservation. The HD‑MA35U returns to active mode (turns on) automatically when an audio input becomes present.
Hotel Provides Multiple Video Monitors that Display Daily Schedule of Events
AN-2090
Description
The daily Calendar of Events listing at this hotel is generated from an office computer. An RDL EZ‑VM14 distributes the VGA signal of the schedule display to three monitors located near the entrances of the hotel meeting rooms. The wide bandwidth of the EZ‑VM14 insures that the same high resolution image seen at the local monitor is seen at each hotel monitor.
Meeting Room with Portable Active Loudspeakers
AN-2245
Description
All audio processing in this meeting room is handled by a centrally‑located Dante‑enabled DSP. The RDL DD‑BN22 Bi‑Directional Mic/Line Dante Interface provides inputs for up to two microphones and analog outputs to feed the two portable active loudspeakers. Each XLR input provides three switches that are set from the front of the unit before the cover plate is installed. One switch enables or disables P48 phantom; the second switch selects the mic or line gain range; the third switch sets the gain. Rear‑panel switches set each XLR output to mic or line level.
Format-A with CATx Cable Adds Separate Analog User Line Inputs to Wireless Bluetooth Source
AN-2250
Description
One Format‑A receiver is used to provide two mono line‑level signals to a local mixer‑amplifier in the equipment rack. Bluetooth audio is sent to the receiver on pair B. Pair C is used to receive mono‑summed audio through the Mini‑Jack or pair of RCA jacks mounted next to the Bluetooth receiver. Audio is connected from the Format‑A senders through CATx cable with standard RJ45 connectors. The use of Format‑A provides simple connection using CATx cable and the economy of a single receiver and power supply.
Automatic Attenuation Avoids Feedback Between Pick-Up Mic and Monitor Speaker
AN-2205
Description
This sound system is designed to provide clear communication between two presenters and an assembled group. The two presenter positions are each equipped with a table‑top microphone and loudspeaker. The loudspeakers allow the presenters to clearly hear questions from the audience as well as each other. The audience microphone and the two presenter microphones are mixed in the rack; a line‑level signal feeds the amplifiers for the house and the table‑top loudspeakers. Each RDL ST‑GSP1 Gated Speech Preamplifier provides an automatically‑switched line‑level output from a microphone. When an ST‑GSP1 preamplifier is gated ON, the SLAVE (open‑collector) output mutes its associated ST‑MA2 Monitor Amplifier (and RU‑SP1 Monitor Speaker) and attenuates the adjacent monitor speaker, thereby preventing feedback. (Terminals on the ST‑MA2 can MUTE or provide 3 dB or 6 dB of attenuation while pulled to ground, permitting this wiring method to be expanded to multiple presenter stations.)