User manual BIAMP AUTOTWO

[. . . ] autoTWO Automatic Mixer Operation Manual Biamp Systems | 9300 S. W. Gemini Drive | Beaverton, OR | 97008 | USA | +1. 503. 641. 7287 | www. biamp. com TABLE OF CONTENTS Front Panel Rear Panel Logic Outputs Specifications & Block Diagram Warranty pg. 7 August, 2009 autoTWO INTRODUCTION The autoTWO Automatic Mixer is affordable, extremely versatile, and easy to use. Features include NOM attenuation, adaptive threshold sensing, speech-frequency filtering, manual priority override, selectable channel-off attenuation, and selectable last mic hold. [. . . ] For balanced connection, wire high (+), low (-), and ground ( ). For unbalanced connection, wire high (+) and ground ( ), leaving (-) unconnected. Signal level will be reduced by 6dB when output is unbalanced. Main Output level is affected by the front panel Master control, as well as by automatic NOM Attenuation, which reduces the output level by 3dB for each doubling of active (gated) channels. Aux Output: These plug-in barrier strip terminals provide the balanced line-level Aux Output from the mixer. For balanced connection, wire high (+), low (-), and ground ( ). For unbalanced connection, wire high (+) and ground ( ), leaving (-) unconnected. Signal level will be reduced by 6dB when output is unbalanced. Aux Output level is affected by the front panel Aux control, but not by automatic NOM Attenuation. Stack In: These plug-in barrier strip terminals provide a balanced line-level Stack In to the mixer. Signal entering here is combined with signals from the input channels, and is then sent to the Main Output section. When using multiple autoTWO mixers within a system, connect Main Output of one mixer to Stack In of the next mixer, and so forth. All mixers except the final autoTWO should be assigned as `slaves' (see Master DIP Switches below). For balanced connection, wire high (+), low (-), and ground ( ). For unbalanced connection, wire high (+) and ground to both ( ) & (-). Inputs & Direct Outputs (Channels 1~8): These plug-in barrier strip terminals provide the balanced mic/line Inputs to the mixer. For balanced connection, wire high (+), low (-), and ground ( ). For unbalanced connection, wire high (+) and ground to both ( ) & (-). Phantom power (+48VDC) is available (see DIP Switches below). Unbalanced 'pre-fader' Direct Outputs are available on Channels 1~8, using the (d. Master DIP Switches: These switches assign functions to the mixer as a whole (when pushed up). Slave assigns the mixer as an expander to a `master' mixer. -12dB selects -12dB channel-off attenuation (instead of -40dB). [. . . ] The Logic Output transistors are rated up to a maximum of 24 VDC and 50 mA per output (24 volt relay coils maximum). However, +12 Volts DC is sufficient power for most applications. When using the Logic Outputs to control relays, protection diodes must be used to suppress high voltage transients that are generated when the relays turn off (see diagram on next page). Any of the 1N4004 family of diodes (1N4001, 1N4002, 1N4003, 1N4004, 1N4005, 1N4006, 1N4007, or equivalent) will provide proper protection. [. . . ]