Whirlwind UT-20581-1 manual Description of Block Diagram, Whirlwind AS8X4

Whirlwind AS8X4

The AS8X4 Active Splitter is a 1 rack space, 8-channel active microphone splitter providing 4 isolated outputs per channel. It features:

∙Professional quality mic preamps driving premium quality Lundahl LL1581XL transformers. This eliminates microphone loading effects characteristic of passive splitters

∙4 transformer isolated outputs optimized for transmitting audio down long cables

∙All I/O connections via plug-in Phoenix style screw type terminal strips

∙48-volt phantom power with on/off switch and indicating LED provided on each channel

∙20dB input pad

∙Listen (cue) feature on each channel

∙LED headroom indicators on each channel

∙Ground lift switches on all isolated outputs

∙Internal switches allow 3 different gain settings of the mic preamp

∙2 additional internal jumpers (user changeable without soldering) engage post mic preamp 20dB pads for flexibility in setting different gain structures for various cable lengths

∙Up to 80 channels of split are capable with multiple units and the appropriate power supply

∙Modular design allows for future expansion and individual units are easily changed in the unlikely event they need servicing

∙Power supply and monitor are a separate unit and utilize various wattage supplies, depending on the number of channels in the system

∙Monitor section features a high power headphone driver and VU meter for instant cueing of individual channels

Description of Block Diagram

All audio input and output connections are done via a plug-in type Phoenix style screw type barrier strips. Each inline strip accommodates 4 channels. On the back panel, all input and iso outputs are separate groups. The strips allow termination of wire ends without the splitter unit present and provide for quick and easy connect/disconnect. The Direct IN/OUT terminations, which accept a mic level input, are used for generating a direct-wired parallel output should a 5-way splitter be desired.

Each channel has its own phantom power on/off switch with LED indicator. When engaged, 48 volt phantom power is placed on the Direct IN/OUT + and – terminals. The individual phantom power on/off switches allow worry free hook up to electronic equipment not able to block the 48 volts DC.

After the input, the signal passes thru a 20dB pad. This allows input of line signal levels up to +20dBm.