The Zdirect is a high-quality, totally passive interface that lets you connect instrument-, line-, or speaker-level signals to a mixer or other balanced input through a high-performance audio-isolation transformer. The high-impedance, single-ended 1/4″ input is converted by the transformer into an isolated balanced, low-impedance signal source. The Zdirect’s audio transformer has an extremely flat and wide frequency response, and can handle high signal levels while still maintaining an isolated balanced, low-impedance output. This gives the Zdirect a very clean and neutral sound with a wide variety of signal sources and over long signal runs in high-noise environments. The Input Attenuator switches allow for a wide range of signal levels and the Input Thru jack allows for tapping off of your signal chain. The Ground Lift switch lets you totally separate the input and output signal grounds, when appropriate, to isolate two systems, thereby reducing hum and ground-loop noise. What further sets the Zdirect apart from other DI boxes are its extended features and versatility. ART has added a switchable low-pass filter that cuts out all very high frequency interference. This Bessel filter on the output is placed out of the audio range and is primarily intended to reduce radio frequency interference before it gets into the main system. The filter is also very effective in reducing any digital computer noise artifacts when using the Zdirect as an interface between a computer-based audio workstation and your monitors. The Phase Invert switch, while not normally included with your run-of-the-mill D.I. box, has 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 its passive design allow the Zdirect to provide years of trouble-free service in Live Sound, Permanent/Fixed Install, D.J., and virtually any PA application. Its full feature set, rugged construction, and high-end specifications make the Zdirect the obvious professional's choice.FeaturesFully passive, high-performance transformer design—no battery requiredSwitchable input attenuation (0, -20, -40 dB) & switchable low-pass filterSwitchable ground lift (fully isolates inputs from chassis and outputs)Converts 50k ohm inputs into 600 ohm balanced outputsSwitchable phase invertSpecificationsFrequency Response: 10Hz - 50kHz, +/-.5dB @ +4dBuTHD: .01% Typical @ 1kHz, +18dBu,< .05% @ 100Hz, +18dBuInput Connections: 1/4" TRS unbalanced, 50k ohmOutput Connection: XLR male, 600 ohmFilter Type/Response: Switchable, Low Pass, -3dB @ 30kHzInput Attenuation: Switchable; 0dB, -20dB, -40dBOutput Phase: Switchable, Normal/InvertGround Lift: Switchable, fully isolates inputs from chassis and outputsDimensions (HxWxD): 1.75" x 4.2" x 3.5"Weight: 0.75 lbs ART Z-DIRECT Zdirect Passive DI Box.