The Radial Engineering Trim-Two is a passive direct box designed for use with laptop computers, smart-phones, tablets and other consumer devices where the user has a requirement for a readily available volume control for quick adjustments on stage.The Trim-Two includes a choice of input connectors that include dual 1/4" jacks, left and right RCA's, and a 3.5mm stereo input. Each pair of connectors is wired in parallel with one another, allowing any of the inputs to be used as stereo thru-puts to feed an alternate signal path such as stage monitors. Inside, a pair of great sounding Eclipse transformers isolates and balances the signal with a linear frequency response from 30 Hz to 20 kHz. Capable of handling levels up to +15dB, these transformers provide typical -10dB consumer electronics with plenty of headroom.As the Trim-Two is completely passive, no power is required. One merely connects the source to the Trim-Two and the XLR's to the PA System. An easy to access front panel level control makes adjusting the volume a snap, allowing the presenter or performer to quickly change the levels without the aid of a sound technician. The Trim-Two also features a handy Mono/Sum switch, making it easy to connect to mono PA systems or to split the balanced output off to two destinations. Finally a ground lift switch is included at the XLR outputs to further reduce the possibility of buzz or hum.As with all Radial direct boxes, the Trim-Two features a 14 gauge steel I-beam inner frame and unique book-end outer shell to withstand the abuse of live production. These features all combine to make the Trim-Two a great choice for keyboard players, DJ's and audio-visual presenters that employ a laptop or tablet and demand quick access to a volume control.FeaturesStereo direct box for line level sourcesPassive signal path with transformer isolationEliminates hum and buzz when connecting to the PALevel control and mono sum switchSpecificationsAudio Circuit Type: Passive, transformer basedTransformer: CustomShield: Copper foil# of Channels: Dual channel (stereo)Frequency Response: 20 Hz to 20 kHzDynamic Range: >100dBTotal Harmonic Distortion: 0.009%Phase Deviation:< 10°Input Connectors: Dual 1/4", RCA, and 3.5mmInput Impedance: 10 kΩ, unbalancedMaximum Input: +20 dB @ 20 HzOutput Connectors: Dual XLROutput Impedance: 28 kΩ, balancedInput Pad: Variable level controlMono Sum: Merges left + right sources to monoGround Lift: Disconnects pin-1 @ both XLR outputsConstruction: 14-gauge steel chassis and outer shellDimensions (H x x D): 2" x 3.3" x 5.0" (48 x 84 x 127mm)Weight: 1.55 lbs (0.70 kg)Power: Passive, no power requiredConditions: For use in dry locations only between 5°C and 40°C Radial Engineering Trim-Two Passive Stereo Direct Box with Level Control.