Whirlwind AS8X4 User Manual

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.
Whirlwind AS8X4