User manual ART DUALZDIRECT

[. . . ] DUALZDirect Dual Channel Passive Direct Box ARTcessories The DUALZDirect provides two independent high quality totally passive interfaces that let you connect instrument, line, or speaker level signals to a mixer or other balanced inputs through high performance audio isolation transformers. Each of the high impedance single-ended 1/4" inputs is converted by a transformer into an isolated, balanced, low impedance signal output. [. . . ] We have added switchable low pass FILTERs that cut out all very high frequency interference. These Bessel filters on the outputs are placed out of the audio range and are primarily intended to reduce radio frequency interference before it gets into the main system. The filters are also very effective in reducing any digital computer noise artifacts when using the DUALZDirect as an interface between a computer-based audio workstation and your monitors. The PHASE INVERT switches, while not normally included with your "run of the mill" DI box, have been added to allow you to switch signal polarity right at the source. This feature is especially handy when you are combining a direct tap with a microphone feed in the mix. The compact black-anodized all aluminum case and it's passive design allow the DUALZDirect to provide years of trouble free service in Live Sound, Permanent/Fixed Install, D. J. , and virtually any PA application. It's full feature set, rugged construction, and high-end specifications make the DUALZDirect the obvious choice. FEATURES: Fully passive, high performance transformer design. Converts 50k Ohm inputs into 600 Ohm balanced outputs Switchable input attenuation (0, -20, -40 dB) Switchable low pass filter Switchable phase invert Switchable ground lift (fully isolates inputs from chassis and outputs) XLR connectors for balanced outputs Rugged extruded aluminum case SPECIFICATIONS: Frequency Response THD Channel Separation Input Connections Thru Connections Output Connections Input Attenuation Filter Type / Response Dimensions Weight 10 Hz - 50 kHz, ± 0. 5 dB @ +4 dBu . 01% typical @ 1 kHz, +18 dBu <. 05% @ 100 Hz, +18 dBu > 80 dB (typical) 1/4" TRS unbalanced (2), 50 k Ohm 1/4" TRS (2) XLR male (2), 600 Ohm Switchable, (0, -20, -40 dB) Switchable, low pass, -3 dB @ 30 kHz 1. 85 H x 4. 6 W x 3. 9 D (in) 47 H x 117 W x 99 D (mm) 0. 88 lbs / 0. 40 kg INSTALLATION and OPERATION: 1) Connect your instrument, line, or speaker level signal to either of the INPUT 1 or 2 1/4" TRS phone jacks. Connect one end of a phone jack cable to the corresponding THRU 1/4' TRS phone jack and the other end to where your signal was going to, if connecting the DUALZDirect inline in the signal path. Repeat for the other INPUT and THRU jacks if desired. [. . . ] Select the GROUND LIFT feature to lower hum and other ground loop noise, if present. The PHASE INVERT feature may be used to correct phase error problems elsewhere in the audio system. 2) 3) [. . . ]