56 Applications for Boardrooms
10 Items Per Page
Buffering High Quality Audio Feeds
AN-2141
Description
Speeches, government meetings, product announcements and other media events covered by reporters require multiple high quality audio feeds in the press room. The recording equipment may require a balanced or unbalanced line level or mic‑level signal. Each output feed must be isolated so that if one output is accidentally shorted or back‑fed, all other feeds and the public address system remain unaffected. An RDL RU‑ADA8D Audio Distribution Amplifier provides isolated audio output signals that drive a variety of audio jacks on a "Media Panel." An RDL RU‑MX4 Professional 4‑Input Mixer with selectable compressor is used to mix the audio sources. The line‑level mix is distributed by the RU‑ADA8D to up to 16 line‑level outputs on RCA, 1/4" phone, or XLR jacks. Any of these outputs could be padded down to mic level using RDL TX‑LM2 line‑level to microphone‑level transformers. All jacks shown are on Decora® compatible wall plates. These jacks are also available in the RDL AMS series should a custom rack or tabletop configuration be preferred. Video distribution may be added using RDL composite and VGA/XGA distribution amplifiers.
Audio/Visual, Wireless Mic System, 3 Channel Mixing with 40 Watt Amplifier
AN-2051
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.
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.
Eliminate Audio Pops During System Power-Up and Power-Down
AN-2173
Description
The RU‑SQ6A Sequencing Controller provides complete power distribution management in this sound system. Sequencing the power ON and OFF of the system avoids annoying and sometimes damaging thumps and pops by turning power amplifiers ON last and OFF first. In systems using large power amplifiers, the sequencing of power can also avoid high inrush currents during power up. The RU‑SQ6A features outputs for six sequential steps. The Timing Interval between steps may be adjusted between 1 and 10 seconds. Each step is provided with both Open Collector and SPST dry contact outputs. In this application Open Collector outputs are used to activate the TX‑PD8X Switching Power Supply Distributors that power numerous other RDL products while dry contact closures are used to activate OEM low voltage controllable mains power outlets. Remote ON/OFF control of the RU‑SQ6A is provided by a D‑RT2 Remote Control Selector. Visual indication of the ON/OFF status is provided on the remote control.
Studio Quality Volume Adjustment for Professional and Consumer Applications
AN-2158
Description
The RU‑VCA2A Two Channel Digitally Controlled Attenuator and RLC10K Remote Level Control are used to increase and decrease the level of the Stereo Sound source feeding the amplifiers. The RU‑VCA2A offers clickless level adjustment, accurate tracking and outstanding wide‑band, low‑noise studio quality performance. It can be controlled remotely by a variety of RDL or third‑party controls and/or locally via front‑panel pushbuttons. Each audio input and output may be configured balanced or unbalanced. Multiple RU‑VCA2As and/or RU‑VCA6As may be linked together for single‑point level control of 7.1, 10.2 or 22.2 surround sound systems.
Boardroom AV System
AN-2110
Description
Three compact RDL EZ‑series modules handle all the audio and video signals for both local presentations in this boardroom and to interface with video conferencing. The EZ‑MX4ML Mic and Stereo Line Audio Mixer and the EZ‑MXA20 20 Watt Stereo Audio Mixer Amplifier together provide 3 mic inputs with phantom power and 3 stereo line‑level inputs. The EZ‑MXA20 provides 10 Watts to each of the 8 Ohm speakers in the room and allows for bass and treble tone control adjustment. The EZ‑VM22E VGA/XGA Switcher/Equalized Amplifier switches between the video conference system and the local video source. It also routes the selected video source to both monitors in the room. All the RDL system electronic products are mounted in an EZ‑CC6 Component Chassis. The EZ‑RA6 Rack Adapter is available for rack mounting of the EZ series modules.
Adapt Standard Audio Amplifiers to a Dante&trade Network
AN-2237
Description
An FP‑NML2V Network to Mic/Line Interface with VCA receives two channels of Dante networked audio, one for each room or zone. The digital audio is converted to balanced audio to drive any standard amplifier. The FP‑NML2V incorporates a VCA in each audio output. Each VCA is controlled by a D‑RLC10 Remote Level Control in the zone. The D‑RLC10 is a rotary encoder style remote that provides a 0 to 10 Vdc control output. One FP‑PA35A Power Amplifier drives the speakers in each zone. The amplifier gain is fixed at the maximum level needed in the zone. Users adjust the audio level in the zone using the D‑RLC10. Because the level in the zone is adjusted by the FP‑NML2V, any standard audio amplifier may be used for each zone.
Mixing a Condenser Microphone and Stereo Source to a Mono Line
AN-2202
Description
The sound system in this room is equipped with a mono balanced input from the floor box. When the podium is in use, the presenter uses the condenser microphone and also uses an audio player (or laptop computer) in the podium. The ST‑MPA48 provides the P48 phantom voltage for the condenser microphone. The three inputs on the ST‑UMX3 Universal Audio Mixer mix the microphone with the left and right unbalanced audio player outputs. The ST‑UMX3 provides a balanced mono mic‑level or line‑level (switch‑selectable) feed to the sound system input. The small size of the ST‑UMX3 and the ST‑MPA48 allows them to be installed in the podium or the floor box. The ST‑UMX3 3X1 Universal Audio Mixer is used to combine signals of different level, impedance or balanced/unbalanced configuration. Each input and the output is switch‑selectable for mic or line level. Single‑turn trimmers are provided for the gain adjustment of each input. The ST‑MPA48 contains two identical phantom power circuits and a common power supply input. If only one mic input is to be converted for phantom operation, only one circuit needs to be used. Phantom voltage is not present on the output terminals.
Galvanic Isolation for Audio “Ground Loopâ€
AN-2096
Description
A laptop computer that is connected to AC power typically produces a “ground loop†if its audio output is connected to an installed sound system. The difference in ground voltage between the computer and equipment rack amplifier causes a hum in the audio signal. Small “ground loop†voltages can produce high audio hum levels from the speakers. Installing the RDL EZ‑HK1 between the computer and the system input removes the “ground loop†using a stereo pair of high quality audio transformers in a shielded metal enclosure. The input jacks are ground‑isolated. A ground‑lift switch allows the output jack shields to be lifted from the metal chassis if required. Audio connections are easy to interface between jack types. The EZ‑HK1 input provides both stereo RCA jacks and a stereo mini‑jack. The output also is provided on stereo RCA jacks or a stereo mini‑jack.
VCA Controlled Audio Amplifier with Matching Remote Control and Input Connector Plates
AN-2102
Description
RDL passive input plates are used to connect audio and video from the boardroom to a central equipment rack for processing and recording. The D‑AVMB2 Audio and Video Jack plate is used for a laptop computer; the D‑XLR3F XLR Female Jack plate is used for the lectern microphone. The line output of the audio mixing/switching equipment in the rack feeds an RDL RU‑PA40D Stereo Audio Amplifier. The amplifier is equipped with an internal VCA which is controlled by the RLC10K Remote Level Control that matches the style of the input plates. The RU‑PA40D provides ample compressed audio power to meet the requirements of both small and large boardrooms and conference rooms.