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Networked with a Centrally-Located DSP



The RDL DD-BN2ML Wall-Mounted Bi-Directional Mic/Line Dante Interface provides all necessary audio connectivity for this meeting room and is networked with a centrally-located Dante-enabled DSP. The 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. The 3.5mm input sums the left and right channels of a stereo source to mono to feed one Dante network transmit channel. The two male XLR connectors on the D-XLR2M wall plate are wired to the two line level outputs on the rear of the DD-BN2ML to feed the two active loudspeakers. The DD-BN2ML and D-XLRM2 are shown mounted together in a triple-gang RDL surface-mounted box.


Remote Decora Loudspeakers Serve Dual Duty as Microphone and Speaker



Two RDL D-SP1A Decora-style wall-mounted loudspeakers are used in this intercom system. The control station uses the speaker for monitoring. The remote station uses the D-SP1A as both microphone and speaker, switched by an RDL ST-LCR1 Logic Controlled Relay. Signal amplification and muting is provided by a pair of RDL ST-IC1 Intercom Amplifiers. The D-SP1A simplifies the physical installation and provides superior audio clarity to similarly-sized loudspeakers. The control station is equipped with a push-to-talk microphone to control the direction of the conversation.


BGM and Paging Audio Transmitted Between Buildings Over Existing Network



Dante 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.


Multiple Paging Zones



A Dante network is used to distribute several sources of facility-wide paging to multiple buildings. Within each building (one is shown), networked audio is converted to RDL Format-A for distribution to three floors using an RU-NFD Network to Format-A Interface/Distributor. Each paging source is routed to Format-A Pair A, Pair B or Pair C through Dante Controller. The RU-NFD provides three Format-A output jacks that each send audio on pairs A, B & C to a twisted pair receiver on one floor, then in turn to additional receivers on the other two floors. By setting each TX-TPR1A receiver to a different receive pair (A, B or C), each floor receives its own paging source. An All Call initiated at the main paging station will page all floors simultaneously. 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 RU-NFD. (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.)


Two P48 Condenser Microphones Mixed to a Single Recording Channel



The two microphones in the Observation Room are mixed by an ST-MX2 to a single MIC input on the recorder. The ST-MPA48 provides phantom power to the two P48 condenser microphones. The ST-MX2 provides individually selectable MIC or LINE inputs and offers both a MIC and LINE output. Inputs and outputs may each be configured balanced or unbalanced. The ST-MPA48 provides 48 Vdc phantom voltage for P48 designated condenser microphones. The ST-MPA48 is normally powered from a standard RDL 24 Vdc power supply or may be powered by any dc voltage from 10.5 volts to 26 volts.


Audio Leveling and Overload Protection in a Church Audio System



The RDL ST-CL2 Compressor/Limiter is connected at the output of the church mixer to improve audio level consistency and avoid input overload of the PA system and the digital recorder that provides recordings of each service. The ST-CL2 remains aurally transparent by automatically adjusting its compression ratio in response to the varying character of program material. It combines both inaudible gain reduction and the tight peak control necessary to prevent overload distortion at the input of the power amplifiers and digital recorder. The inclusion of the ST-CL2 Compressor/Limiter improves intelligibility for the congregation and for people listening to the recording. The ST-CL2 is easily set up using the two compression level LEDs provided. The ST-MPA48 provides the phantom power for the P48 condenser microphone converting the existing mic input on the house mixer into a 48 Vdc phantom-powered input. The ST-MPA48 contains two identical phantom power circuits and can be used to power two P48 microphones. The ST-MPA48 is powered from a standard RDL 24 Vdc power supply or may be powered by any dc voltage from 10.5 volts to 26 volts.


Two Condenser Microphones Mixed to a Single Recording Channel



In this Observation Room, an ST-MX2 mixes the two microphones to a single MIC input on a recorder. The ST-MPA2 provides phantom power to the two condenser microphones. The ST-MX2 provides individually selectable MIC or LINE inputs and offers both a MIC and LINE output. Inputs and outputs may each be configured balanced or unbalanced. The ST-MPA2 can provide phantom voltage for most currently produced condenser microphones when used with a standard RDL power supply.





The ST-EQ3 3 Band Equalizer shown in this paging system tailors the system for voice-band intelligibility. The midrange control boosts the voice band (200 Hz to 7 kHz). Low and High band controls attenuate audio frequencies outside of the voice band. The center frequency of each of the three bands may be adjusted by +/- 12 dB. Note: The ST-EQ3 is a cost-effective module to enhance a variety of systems including adjustable “loudness” equalization for music in PA applications.


Paging Connected to a Remote Controlled Mixer with Twisted-Pair Input Modules



The meeting room has two microphone inputs connected to an RDL FP-TPX3A 2-input mixer using twisted-pair cable. Volume for each microphone is user-adjusted on the wall-mounted D-RC2M which is also connected to the mixer using twisted-pair cable. The third input of the FP-TPX3A is used as the balanced, line-level paging input. The paging level is set at the mixer so it cannot be turned down or off by a user in the meeting room. The FP-TPX3A allows user remote control of the local inputs while maintaining a fixed level for the facility priority paging. The use of standard twisted pair cabling using RJ45 connectors cuts both installation time and cost.


Facility-wide Background Music with Examination Room Paging



This medical office is set up as a two-zone system in which only the examination rooms receive paging. All rooms in the facility are provided with background music. The HD-MA35UA Mixer Amplifier (Zone 1) powers the speakers in multiple examination rooms where paging is required. Its Zone 2 mixer output provides balanced line-level background music without paging to the FP PA35A Power Amplifier that powers the speakers in the reception and waiting room. Two wall-mounted AMS-10K controls permit independent volume adjustment for each zone. The HD-MA35UA features an integral VCA for Zone 1 level control. An ST-VCA3 is used to control the level in the areas served by the FP-PA35A. The ST-VCA3 is powered by the auxiliary module 24 Vdc power output from the HD-MA35UA. Note: If the waiting room is small enough for background music supplied by one or two low-power speakers, the system may be installed without the FP-PA35A, ST-VCA3 and associated AMS-10K, instead using the HD-MA35UA Zone 2 amplifier (4 W) to power low impedance speakers in the waiting room. The HD-MA35UA and FP-PA35A both enter an automatic sleep mode to provide significant energy and cost savings when the system is idle.


Distributed Audio For Dental Offices



Patients select the audio source and listening level in the dental chair using an SAS-HC8 Headphone Control Station. Three sources are available for selection in each dental chair location: CD player music, Satellite music or MP3 music. The SourceFlex system accommodates a maximum of 8 possible audio sources, plus one paging input. The stereo audio sources are converted to mono using RDL TX-J2 modules and connected to the rack-mounted SAS-8i Audio Input Chassis. All control, power and audio signals connect through a single wiring cable between each SAS-HC8 and the SAS-8i. The SAS-8i supports a maximum of four separate dental chairs and provides connection of multiple expansion chassis: SAS-82 Two Station Controllers and SAS-8C Eight Station Controllers. There is no practical limit to the number of possible zones.


Two Chair Dental Office



The expandable SourceFlex audio system provides distribution of up to 8 audio sources to multiple locations (or zones) throughout a facility. Source selection and audio level for each zone are controlled by the SAS-RC8. In this system, two sources are being distributed to two different patient rooms in a dental office. The stereo outputs from two separate audio sources (satellite receiver & MP3 player) are converted to balanced mono signals using two RDL TX-J2s. The mono source signals are fed into the inputs of the SourceFlex Audio Input Chassis (SAS-8i). Each room in the dental office has a wall control station (SAS-RC8), which also provides power for a local speaker. Only one cable run is needed between each control station and the SAS-8i Audio Input Chassis for control and electrical power.


Constant Voltage Distributed System



The constant voltage speaker system makes it easy to distribute audio throughout a facility. Speakers can be placed above the listeners tapped for appropriate power levels totaling up to the total amplifier capacity. The TX-J2 is used to provide a balanced mono signal from the projector’s unbalanced stereo output. For this conference room, the FP-PA20A constant-voltage (70 or 100 Volt) amplifier provides up to 20 Watts RMS to speakers located directly above the seating area. The integral compressor/limiter allows high average power levels of audio free from clipping and distortion. The FP-PA20A can be used in applications that previously would have required amplifiers rated for much higher power levels. In this example, the amplifier is feeding four speakers at equal power levels. The 70 Volt system makes it easy to distribute audio so that clear, intelligible audio is available for all listeners.


Automatic Ducking with Multiple Paging Locations



This application provides multiple paging locations, with priority assigned to each location. Each location has a mic equipped with a PTT (push-to-talk) momentary pushbutton. The STM-2 preamp for each microphone should be installed near the associated mic. Wiring between each STM-2 output and the corresponding ST-VP2 is balanced, connected with shielded or unshielded twisted-pair cable. When any microphone is used, the music fades down and paging becomes active. The highest priority mic overrides the lower priority mic(s). This arrangement may be carried out for an unlimited number of paging locations. The FP-PA20A 20-Watt Power Amplifier feeding 70 Volt speakers is used in this example. RDL offers a wide range of power amplifiers for paging and public address applications.


School Paging Interrupts Classroom Audio



This system uses a TX-PCR1 Paging Controlled Relay to interrupt classroom audio to allow a page to be heard clearly. Classroom audio is fed through a wall plate to the 70 Volt amplifier. The 70 V speaker output is routed through normally closed contacts of the paging-controlled relay to the classroom speakers. The paging-controlled relay samples the 70 V audio to the classroom paging speaker. Whenever school-wide paging is active the relay is energized, and the classroom audio is interrupted. This allows the page to be heard without interference from the classroom audio. The wall plate used in this example is available in the normal RDL grey/white or in stainless steel with custom labeling available.


Quality Audio System for Boardroom or Conference Room



Many projectors incorporate source switching and audio level adjustment into their remote controls. They seldom offer a high-quality audio power amplifier suitable for a large boardroom or conference room. The TX-PA40D fills that need. A stereo amplifier with integral compressor/limiter, the TX-PA40D is capable of maintaining high average audio power levels free from clipping and distortion. There is an input switch to sum the stereo inputs for those facilities where speaker placement does not allow for good stereo imaging. In this example, the amplifier is feeding two pairs of 8 Ohm speakers so that four speakers can be used to evenly distribute the audio throughout the room. The compact footprint of the TX-PA40D allows it to be mounted to the projector or other convenient location. This compact, professional amplifier may be mounted in just a few square inches of space.


Intercom System for Health Care Facility



This intercom system allows a health care worker to communicate with a patient in the adjacent room while keeping both hands free for taking notes, using a computer, or accessing reference material. This system is set up with two intercom amplifiers that are both switchable by the health care worker. A foot switch provides a dry contract to control the directional flow of the audio. The ST-IC1 intercom amplifiers can provide phantom power to condenser microphones and will directly drive a low impedance speaker.