BASIC TWO ROOM COMBINING SYSTEM
School Cafetorium Room Combining System with Automatic Audio Leveling Compression
This cafetorium can be used as one large room or as two smaller rooms formed by movable wall partitions. Each room has one mic and one mono or stereo line‑level input connection through a DS‑J3 input plate. EZ‑MCP1 Microphone Compressors provide consistent level and overload protection on the mic inputs. ST‑CL2 Compressor/Limiters provide the same benefits for the line inputs. The DS‑RCX2 Room Controls provide volume control in each room and allow selection of a common external source (typically background music). The RCX‑5C controls the audio system configuration, separating or combining the inputs and amplified audio to the speakers according to the room usage (one large room or two smaller rooms). The paging input overrides the audio in the entire cafetorium. Note: The RCX‑5C can be used for room combinations from two to five rooms. An HD‑PA35UA Audio Power Amplifier is used for each zone in this system to feed 70 Volt speakers. The HD‑PA35UA has an automatic sleep mode that shuts off the power amplifier when it is not in use. This offers significant energy savings for systems not operated by technical staff.
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.
MEDICAL OFFICE DISTRIBUTED SOUND SYSTEM
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.
SOURCEFLEX SYSTEM - Two 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.
AUDIO DISTRIBUTION OVER TWISTED PAIR
Multi-Zone Paging w/BGM and Message Repeater
An RDL FP‑MR2 Message Repeater plays back pre‑recorded messages and provides ducking or muting of the BGM source during message playback. The
message repeater can be programmed to repeat automatically or may be triggered manually. Two dynamic or condenser microphones are pre‑amplified to
line‑level by an RDL HR‑MP2 Dual Microphone Preamplifier. All three audio sources (BGM/Message Repeater, Paging Mic 1, Paging Mic 2) are distributed
to each of the three floors of an office or retail building over readily available CAT5 cabling utilizing an RDL RU‑TPS4A Active Sender/Distributor and three
TX‑TPR3A Active Receivers (one per floor). Each Active Receiver provides line‑level audio to an RDL HD‑MA35A Mixer Amplifier. The BGM/Message
Repeater signal connects to Input 2 of the mixer amplifier on each floor. Input 1 of each mixer amplifier is fed from the Receiver output that corresponds
with the Paging Mic (1 or 2) that will be used to page on that floor. Input 1 is set to "duck" the other amplifier input(s) so paging will take priority.
The RDL Format‑A twisted pair products provide flexibility and expandability for this multi‑zone paging system. Additional floors may be added using
additional receiving modules and amplifiers./
SEND UNBALANCED AUDIO OVER A LONG DISTANCE
Balanced Audio Connections Between Stereo Unbalanced Devices
Unbalanced audio is not suited to long distance transmission due to susceptibility to hum and ground loops. This problem is avoided by balancing the audio source prior to transmission and by isolating the received signals with effective common mode (hum) rejection. This application uses an RDL STA‑2A Dual Line Amplifier to boost the unbalanced stereo source up to the standard +4 dBu level to drive a pair of balanced lines. The balanced lines may be shielded or unshielded (UTP) and may be up to several hundred feet long. An RDL TX‑A2D Dual Audio Converter receives the balanced audio, converts it to unbalanced and attenuates it to a standard ‑10 dBV level feeding RCA output jacks. Studio quality audio transformers in the TX‑A2D provide very high common‑mode hum rejection and galvanic isolation from the balanced lines. The received remote source is connected to one of the stereo unbalanced inputs of an RDL EZ‑MX4L stereo audio mixer that feeds the conference room amplifiers and speakers.
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 totalling up to the total amplifier capacity. The TX‑J2 is used to provide a balanced mono signal from the projectors 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.
AMPLIFICATION FOR OUTDOOR POLE-MOUNT SPEAKERS
Pole Mounted Power Amp Operation in Extreme Temperatures
This outdoor parking area is equipped with speakers mounted in the lamp structures to provide music and paging coverage. Speakers in each pole are
powered by an RDL FP‑PA18H 18 Watt Hi‑Temp Audio Amplifier. The amplifier module is mounted in an unventilated watertight enclosure at the base of
each pole. The poles recieve direct sunlight causing the potential for high internal ambient air temperatures.
The highly efficient FP‑PA18H is ideally suited to this environment. It is designed for operation in ambient temperatures up to 70 degrees Celsius (about
158 degrees Fahrenheit) and contributes negligible heat to the ambient temperature inside the pole.
The amplifiers integral compressor/limiter insures maximum intelligibility by keeping average power levels high and preventing clipping. The FP‑PA18H
combines RDL's high audio performance standards with the capability of operation in harsh temperature environments.
1] If it is desired to monitor the operation of the complete system, the audio detector included in each FP‑PA18H can be wired back to the system audio rack to confirm that audio is being
received and amplified at each pole.
2] If the FP‑PA18H is acquired with an RDL power supply, that supply must be located in an ambient environment not to exceed 40 degress C. FP‑PA18H modules are available without a
power supply for use with high temperature supplies or in systems using distributed 24 Vdc power. Contact RDL Technical Support for more information.
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.
CLINIC CLASSROOM AUDIO/PAGING SYSTEM
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 ouput is routed through normally closed contacts of the paging controlled relay to the clasroom 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.
INTERCOM USING SINGLE REMOTE SPEAKER
Speaker Serves Dual Duty as Microphone and Speaker
This intercom application reduces the hardware requirements for a secure or weatherproof call box like those found in drive‑through talkback systems or secured entryways. The ST‑IC1 Intercom Amplifier input accepts a dynamic mic or phantom powered condenser mic. It can also use an 8 Ω or a 45 Ω speaker as a microphone element. An ST‑LCR1 Logic Controlled Relay is used in this application to switch a remote speaker so that it can function alternately as a speaker and as a microphone.
SOURCEFLEX SYSTEM FOR DENTAL CHAIRS
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.
DISTRIBUTED VGA VIDEO TO MULTIPLE MONITORS
Hotel Provides Multiple Video Monitors that Display Daily Schedule of Events
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.
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.
KSU/PBX PAGING WITH BGM OVERRIDE
Paging System for Office Space with BGM Override
This example shows how to utilize a telephone line (input) port on an existing KSU to add paging from the telephone system to a background music (BGM) system. The ST‑TC1 acts as a virtual telephone line when connected to a KSU FX port. When that “line” is selected using any phone instrument connected to the KSU, the ST‑TC1 provides audio from the instrument mouthpiece to the ST‑VP2 Automatic Ducking Module. The ST‑VP2 automatically ducks the background music audio for the duration of the page, then ramps up the music at the end of the page. In this example an FP‑PA20A 70 volt amplifier is powering 70 volt loudspeakers in the office area. The ST‑TC1 provides relay contact closures when it is activated by a telephone instrument. The relay contacts can be used to provide additional functions when paging is active, including visual indicators or triggering a radio transmitter.
PAGING DISTRIBUTION IN OFFICE COMPLEX
Common Paging for Multi-Story Office Building
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.)