Crown International, Inc.","Crown's CTs Series amplifiers provide exceptional performance, flexibility and value for installed sound applications. CTs Series amplifiers feature independent selection of high and low impedance operation for a specific channel, plus power levels and features that were carefully chosen to match the requirements of fixed install design. Easy integration with HiQnet™ and CobraNet™ allows CTs amplifiers to deliver a comprehensive lineup of monitoring and control features along with digital audio transport for an award-winning digital audio solution.*High power density. All two channel models and four channel model in a 2RU chassis, eight channel model in a 3RU chassis*Crown Switching Power Supply for lighter weight*Selectable \"Constant-Voltage\" or low-impedance (4\/8 ohm) operation per channel on 2-channel models, and per channel-pair on 4-and 8-channel models*100V direct outputs on CTs 2000, CTs 3000, CTs 4200, and CTs 8200*Legendary Crown class-I (BCA) and AB+B output topologies offer the best in amplifier reliability*4- and 8-channel models offer perfect independent power solutions for multi-zoned systems? \"FIT\" (Fault Isolation Topology) circuitry on 4- and 8-channel models isolates fault conditions without affecting neighboring channels*Comprehensive array of indicators provide accurate diagnostics*Two-channel models are fully PIP2-compatible. Multi-channel models accept MC accessory modules.
RDL, Radio Design Labs","The D\/DS SH1 is used in applications requiring headphones of any impedance to be driven from consumer or professional audio sources. The D\/DS-SH1 is ideally suited to applications as diverse as language translation, museums, interview studios and music stores. The module mounts conveniently in a precut opening in a wood or metal enclosure or in various RDL mounting accessories. The D\/DS SH1 is a dual channel headphone amplifier with balanced\/unbalanced left and right inputs. Each input accepts operating levels between -20 dBV and +20 dBu. Two recessed slide switches located on the side of the rear enclosure are set prior to mounting the module. One switch is provided for setting the input sensitivity. The mode switch selects between stereo and mono operation. In the mono position, the left input is used to drive both output channels. When the module is used in a monaural system, only the left channel input must be wired. The front panel level control is a long life potentiometer controlling matched VCAs. Audio does not pass through this control, assuring years of noise free level adjustment. The output amplifiers deliver more than 50 mW into either high or low impedance headphones through a durable, metal ¼\" (6.3 mm) standard headphone jack. Module operation is from a 24 Vdc ground referenced power supply. It can also operate from a 12 Vdc supply with a 6 dB reduction in headroom and a maximum output power of 10 mW.