Radio Design Labs RUSX4A

The RU-SX4A is part of the group of versatile RACK-UP products from Radio Design Labs. The RACK-UP series features the advanced circuitry for which RDL products are known, combined with accessible, user-friendly controls and displays. The ultra-compact design permits high-density installations, with three products mounted in a single rack unit! Single RACK-UPs can be mounted right where they are needed using the adhesive methods popularized by RDL's STICK-ONâ„¢ series of products. Optional brackets permit mounting a RACK-UP module above, below, or in front of any flat surface. Optional rack-mount adapters and chassis are available for conventional RACK-UP series installation.

The RU-SX4A is the ideal choice in many installations where either local and/or remote audio source selection is desired. Input and output connections are made on the rear panel through full size, clearly identified, barrier block terminals. Each RU-SX4A may connect directly to RDL's wall-mount RCS4 remote control. In stereo applications, a second RU-SX4A may be wired as a SLAVE.

The RU-SX4A features 4 balanced line-level inputs. Each input may be wired balanced or unbalanced. High-impedance bridging inputs allow connection from either high or low impedance sources. The line-level, low-impedance output may be wired to drive either a balanced or unbalanced line. Individual multi-turn level trimmers are provided on the front panel for each input.

Audio switching in the RU-SX4A is solid-state for optimum reliability and long term, noise free performance. No mechanical switching is used in the audio path. The RU-SX4A powers up in the OFF position (no audio input selected). A front panel push-button selects the desired audio source. Remote push-button terminals are available on the rear. Each time the button is pushed, the RU-SX4A advances to the next audio source. A 1/2 second audio-on delay prevents annoying bursts of audio while stepping through audio inputs. Each selected source provides an open-collector output on the rear panel used for remote source indication, to control a second RU-SX4A as a stereo slave, or to skip any unused inputs if fewer than 4 sources are being used. An LED shows the selected source on the front panel. Each input has a write-on label area for identification of the source.

Specifications:

• Inputs (4): line-level, balanced or unbalanced via terminal block
• Input Impedance: 20 kohm bridging
• Headroom: greater than 18 dB above +4 dBu
• Gain: Adjustable for each input, unity +/-12 dB
• Frequency Response: 10 Hz - 50 kHz +/-0.25 dB
• THD: less than 0.010% (20 Hz - 20 kHz)
• Residual Noise: less than -85 dB (referred to +4 dBu) with any input selected (-93 dB typical) less than -95 dB (referred to +4 dBu) with no input selected (-100 dB typical)
• OFF Attenuation: greater than 85 dB
• Crosstalk: less than -85 dB @ 1 kHz; less than -75dB using pink noise
• Indicators: Front panel LED indicating selected channel
• CMRR: greater than 55 dB (50 Hz to 120 Hz)
• Output: 150 ohm source impedance, balanced or unbalanced to drive high or low impedance
• Power Requirement: 24 to 33 Vdc @ 75 mA, Ground-referenced

TMGR# RUSX4A