Description:
Speeches, government meetings, product announcements and other media events are occasions where a number of reporters in the electronic press require a high quality audio feed from the event organizers. The recording equipment in use might require a mic, balanced line level or unbalanced line‑level signal. It is critical that each feed is isolated so that if one feed is accidentally shorted or back‑fed, no other feed will be affected nor will the public address system. This example uses RDL STICK‑ONs® to provide isolated audio output signals driving a variety of audio jacks on a "Media Panel." An RDL RU‑MX4 Pro 4‑Input Mixer is used as the audio source. The line‑level source is distributed through an ST‑DA3 Audio Distribution Amplifier to line‑level outputs on RCA, 1/4¨ phone, and XLR jacks. The same source is padded down to mic level using an STP‑1 Attenuator and distributed through an STM‑DA3 Microphone Distribution Amplifier to the mic outputs. All jacks shown are on Decora® wall plates. These jacks are available in the RDL AMS series should a rack or tabletop mount be preferred. Distribution of video at these events can also be added using RDL composite and VGA/XGA distribution amplifiers.

Description:
This application provides multiple paging locations, with priority assigned to each location. Each location has a mic with a PTT (push‑to‑talk) momentary pushbutton that provides external switching contacts. The STM‑2 preamp for each microphone should be installed near the associated mic. Wiring between each STM‑2 output and the corresponding ST‑LCR1 is balanced, connected with shielded or unshielded twisted‑pair cable. When a PTT button associated with a microphone is depressed, 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. If the background music source provides only unbalanced outputs, an STA‑1M Audio Line Amplifier may be used to provide a balanced signal at the proper level.

If solid state switching is preferred, an ST‑SSR1 Solid State Audio “Relay” may be substituted for each ST‑LCR1.

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.

Description:
This application shows the layout of a two zone noise masking system. The white noise line output from the RDL ST‑NG1 feeds the inputs of two RDL FP‑PEQ3 parametric equalizers. The FP‑PEQ3 equalizers allow the installer to flatten the noise spectrum in each zone. The line output of each FP‑PEQ3 is fed through RDL FP‑PA20A 20W, 70/100 V power amplifiers. The 70 V output of each FP‑PA20A feeds multiple 70 V speakers in its associated zone. Multiple equalizers and amplifiers may be added for larger systems with more zones.

Description:
This Conference/Presentation center is equipped with multiple wall input plates for auxillary audio/video sources such as a laptop computer and wireless microphone. The system includes a mixer with remote volume and muting control. Wall plates are shown at the front of the room where presentations are normally staged. The video input jack is wired directly to the projector using a standard VGA video cable. All signal and control connections between the three wall plates and the mixer use CAT5 wire. The remote controlled mixer is used to set audio levels from the audio input wall plates. The volume and muting controls are located at the front of the room allowing easy access before and during presentations. The amplifier is switched to mono and 4Ω; the output is driving four 8Ω speakers. All wall controls and panels are available in RDL standard white/gray or in stainless steel with custom labeling available.

Description:
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 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.

Description:
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.

Description:
A 70 V audio signal is being distributed to multiple zones in a facility. The RDL TX‑70A provides for the expansion of the existing 70 V system by converting the 70 V signal to an unbalanced line level signal. The unbalanced audio signal feeds the FP‑PA20A 20 Watt 70 V Audio Power Amplifier, which powers the speakers in the additional zone. The TX‑70A is equipped with a level trimmer for achieving optimal signal level.