Logitech 930-000012 Owners Guide - Page 14

26 Logitech® Analog Output Attenuation (For Qualified Personnel Only) Transporter has a set of internal attenuators that can be used to reduce the voltage level of the unbalanced analog outputs. If you are connecting Transporter directly to an amplifier that does not have an input gain control, you may need to change the attenuation level. To change the attenuation level, you'll need to remove the cover of your Transporter and move a pair of jumpers. You'll need a 1/16" hex key to remove the screws holding the cover on. To do this: 1. Unplug Transporter from the AC power. 2. Using a 1/16" hex key, remove four screws on each side of Transporter that hold the top in place. (You do not need to remove any of the screws on the bottom of Transporter.) 3. Slide the top off towards the back of the unit. 4. Near the unbalanced analog outputs, you'll see a set of jumpers, like in the picture below: As it comes from the factory, Transporter is set for 0 dB attenuation. To adjust the attenuation, gently pull the black jumper conductors at the 0 dB position and move them to the position corresponding to the attenuation level you'd like. Choices include -10dB, -20dB and -30dB. 5. Slide the top cover back on and replace the eight hex screws. Detailed Specifications Audio Outputs • Digital and analog outputs • Gold-plated RCA, XLR, and BNC connectors • Volume control is provided for all outputs • Multiple outputs may be used at the same time Transporter™ Owner's Guide 27 Analog Outputs • AKM AK4396 Multi-bit delta-sigma digital-to-analog converter (DAC) • Signal-to-noise, Dynamic Range: 120dB • THD+Noise: -106dB (0.00005%) • Linear Super-Regulated power supplies for DAC and line-out stages Balanced Analog Outputs • Connectors: XLR gold-plated • Level: 3Vrms (8.5Vpp) • Impedance: 100 Ohms • Attenuation: Fixed -0dB Unbalanced Analog Outputs • Connectors: RCA gold-plated • Level: 2Vrms (5.7Vpp) • Impedance 100 Ohms (at -0dB) • Attenuation: Selectable -0, -10, -20, -30dB (Selectable via internal jumpers) Digital Outputs and Inputs • Optical, coax, BNC, and XLR digital connectors • Word clock input for synchronization with an external clock • Linear-regulated power for all clock paths • Dedicated high-precision crystal oscillators (no PLL, no resampling) • Standard IEC-958 (S/PDIF) or AES/EBU encoding • Optical connector: TOSLINK 660nm • RCA connector: capacitor-coupled 500mVpp into 75 ohms • BNC connector: transformer-coupled, 500mVpp into 75 ohms