Description:
This classroom is equipped with a computer and with jacks for an auxiliary audio/video source such as a DVD player or VCR. The computer is connected to a jack plate at the front of the room. The auxiliary input is shown at the rear. Audio from the audio/video input plates is connected to two inputs of a three input audio mixer located near the projector using twisted‑pair cable. The third mixer input is fed from the line‑level output of an IR receiver. (Note: A paging source could be connected to the third mixer input instead of the IR receiver, if desired.) The video is connected directly to the projector using coaxial and monitor cables. The projector audio output is not used. The mixer controls the level of each audio source using the associated wall mounted mixer remote control. The three knobs on the wall control provide separate audio level adjustment for the computer, auxiliary input and IR receiver. The audio power amplifier provides a 70 V and 100 V constant‑voltage output to power multiple speakers. The four speakers shown may each be tapped for 5 watts. All wall controls and panels are offered in RDL standard white/gray or in stainless steel with custom labeling available.

Description:
This classroom is equipped with a computer and with jacks for an auxiliary audio/video source such as a DVD player or VCR. The computer is connected to a jack plate at the front of the room. The auxiliary input is shown at the rear. Audio from the audio/video input plates is connected to two inputs of a three input audio mixer located near the projector using twisted‑pair cable. The third mixer input is fed from the line‑level output of an IR receiver. (Note: A paging source could be connected to the third mixer input instead of the IR receiver, if desired.) The video is connected directly to the projector using coaxial and monitor cables. The projector audio output is not used. The mixer controls the level of each audio source using the associated wall mounted mixer remote control. The three knobs on the wall control provide separate audio level adjustment for the computer, auxiliary input and IR receiver. Each output channel of the power amplifier powers two 8 Ω speakers. All wall controls and panels are offered in RDL standard white/gray or in stainless steel with custom labeling available.

Description:
This classroom is equipped with a computer and with jacks for an auxiliary audio/video source such as a DVD or VCR player. The computer is connected to a jack plate at the front of the room. The auxiliary input is shown at the rear. Audio from each of the audio/video input plates is connected to the projector using twisted‑pair cable. The video is connected using coaxial and monitor cables. Identical jack plates are mounted in the classroom wall and in a box near the projector so the room may be pre‑wired. Installation of the projector is facilitated by plugging its cables into the jacks. The projector is used to switch between sources and to control the audio level to the speakers. The projector must be equipped with a variable level audio output. Each output channel of the power amplifier powers two 8 Ω speakers. All wall controls and panels are offered in RDL standard white/gray or in stainless steel with custom labeling available.

Description:
This classroom is equipped with a computer and with jacks for an auxiliary audio/video source such as a DVD player or VCR. The computer is connected to a jack plate at the front of the room. The auxiliary input is shown at the rear. Audio and video from each of the audio/video input plates is connected to the projector using standard audio wiring and monitor cables. The projector is used to switch between sources and to control the audio level to the speakers. The projector must be equipped with a variable level audio output. Each output channel of the power amplifier powers two 8 Ω speakers. All wall controls and panels are offered in RDL standard white/gray or in stainless steel with custom labeling available.

Description:
This classroom is equipped with a computer, projector and overhead speakers. The computer is connected to a jack plate at the front of the room. Audio and video from the audio/video input plate is connected to the projector using standard audio wiring and monitor cable. The projector is used to control the audio level to the speakers. The projector must be equipped with a variable level audio output. Each output channel of the power amplifier powers one 8 Ω speaker. All wall controls and panels are offered in RDL standard white/gray or in stainless steel with custom labeling available.

Description:
This classroom is equipped with a computer and with jacks for an auxiliary audio/video source such as a DVD player or VCR. The computer is connected to a jack plate at the front of the room. The auxiliary input is shown at the rear. Audio and video from each of the audio/video input plates is connected to the projector using standard audio wiring and monitor cables. The projector is used to switch between sources and to control the audio level to the speakers. The projector must be equipped with a variable level audio output. Each output channel of the power amplifier powers two 8 Ω speakers. All wall controls and panels are offered in RDL standard white/gray or in stainless steel with custom labeling available.

Description:
This classroom is equipped with a computer, projector and overhead speakers. The computer is connected to a jack plate at the front of the room. Audio and video from the audio/video input plate is connected to the projector using standard audio wiring and monitor cable. The projector is used to control the audio level to the speakers. The projector must be equipped with a variable level audio output. Each output channel of the power amplifier powers one 8 Ω speaker. All wall controls and panels are offered in RDL standard white/gray or in stainless steel with custom labeling available.

Description:
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.

Description:
The circuit shown is ideal in applications where paging levels are normally sufficient, but at times high ambient noise levels make the paging impossible to hear. This is common in school hallways which may be empty or crowded, making higher sound system levels necessary during periods of heavy congestion. Normal levels are restored when traffic is minimal. In this example, the STP‑1 Universal Audio Attenuator is used to set two audio levels (normal and high) for the line‑level audio feeding the power amplifier for the hallway. A sensing microphone is oriented to pick up ambient noise but not paging audio. Ambient noise triggers the ST‑ACR1M which switches the higher audio input level to the amplifier. When noise levels return to normal, the ST‑ACR1M switches back to the standard paging level. An RDL TX‑70A Speaker Level Interface can be added to obtain line‑level paging audio from a constant voltage speaker line.

Description:
In this application several RDL modules are used to create a multiple priority paging system. A local audio source can be overridden by an Emergency Alert System (EAS). Either source is overridden by the School Wide Paging source. The local source from the laptop is fed into a DS‑CIJ3 input plate to provide a balanced mono output to the “Music” input of an ST‑VP1 Voice‑ Over Paging Module and passes thru the unit under normal operating conditions. The EAS line level audio is fed to the “Voice” input on the ST‑VP1. A contact closure from the EAS receiver causes the ST‑VP1 to switch from the “Music” audio input to the “Voice” audio input. The output of the first ST‑VP1 will feed the “Music” input of a second ST‑VP1 to allow override by the highest priority source. An RDL STM‑2 mic preamp provides the line level signal to the “Voice” input of the second ST‑VP1. PTT contacts switch from the “Music” input to the “Voice” input to give this microphone the highest priority. The output of the second ST‑VP1 feeds RDL’s FP‑PA20A 70 V amplifier and associated 70 V loudspeakers.

Description:
The EZ‑MXA20 provides a microphone preamp, mixer, limiter, tone control, and a stereo power amplifier in a package less than six inches wide. The EZ‑MXA20 handles sound reinforcement whether the audio source is a computer, DVD player, live presenter, or all three. The power amplifier provides 10 Watts per channel into 8 Ohm speakers or 8 Watts per channel into 4 Ohm speakers. Bass and treble tone controls provide equalization of source material. The limiter controls overloads from clipping the amplifier and an LED on the front panel of the EZ‑MXA20 indicates when the limiter is active.

Description:
The EZ‑MXA20 provides a microphone preamp, mixer, limiter, tone control, and a stereo power amplifier in a package less than six inches wide. The EZ‑MXA20 handles sound reinforcement whether the audio source is a computer, DVD player, live presenter, or all three. The power amplifier provides 10 Watts per channel into 8 Ohm speakers or 8 Watts per channel into 4 Ohm speakers. Bass and treble tone controls provide equalization of source material. The limiter controls overloads from clipping the amplifier and an LED on the front panel of the EZ‑MXA20 indicates when the limiter is active.

Description:
The EZ‑MXA20 provides a microphone preamp, mixer, limiter, tone control, and a stereo power amplifier in a package less than six inches wide. The EZ‑MXA20 handles sound reinforcement whether the audio source is a computer, CD player, live presenter or all three. The power amplifier provides 10 Watts per channel into 8 Ohm speakers or 8 Watts per channel into 4 Ohm speakers. Bass and treble tone controls provide equalization of source material. The limiter controls overloads from clipping the amplifier and an LED on the front panel of the EZ‑MXA20 indicates when the limiter is active.

Description:
In this system, a computer audio signal and a microphone signal are mixed using the RU‑MX4 Pro Audio Mic/Line Mixer. The mixed signal is distributed to multiple headphone listening stations in a language learning lab using an RU‑DA4D Audio Distribution Amplifier. Each listening station features a D‑SH1 stereo headphone amplifier, which includes an integrated level control. Each D‑SH1 is mounted in a DC‑1G desktop chassis. The DC‑1G is constructed from steel and powder coated to provide years of durability in a classroom environment. The design of the D‑SH1 headphone amplifier makes it easy to create systems with an unlimited number of headphone listening stations. Either 1/4" or 1/8" (D‑SH1M) stereo headphone jack options are available. The system design is shown in mono but stereo configurations can be implemented just as easily.