Whirlwind Microphone UT 20581 1 User Manual

Whirlwind AS8X4  
The AS8X4 Active Splitter is a 1 rack space, 8-channel active microphone splitter  
providing 4 isolated outputs per channel. It features:  
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Professional quality mic preamps driving premium quality Lundahl LL1581XL  
transformers. This eliminates microphone loading effects characteristic of passive  
splitters  
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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  
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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  
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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.  
 
The rear panel contains:  
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5 terminal strips - Direct IN/OUT and Iso 1-4. Each of the wire end screw type  
terminals handles 4 channels  
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Individual ground lift switches for every Iso output on the unit  
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A 9-pin DSUB connector that connects the monitor unit and supplies DC power  
to the AS8X4  
As8x4 MONITOR UNIT  
The monitor unit is available with various wattage power supplies depending on the  
number of channels needed in the system. The units are available in 2 configurations,  
rack mount with the supplies mounted to the rack panel, or a 2 space rack unit for the  
monitor section only with the supplies located in a separate Hoffman box with multipin  
connects. The monitor unit can be configured to handle up to 10 AS8X4 splitter units or  
80 channels.  
Specifications:  
Frequency response  
Total harmonic distortion + noise  
Phase shift  
Equivalent input noise  
Total gain  
± .15dBv 31Hz - 18KHz, -3dBv at 20Hz, -1.53dBv at 20  
.0019 % at 1KHz –14dBv  
.4 degrees at 1KHz  
120dBv  
40dBv  
Gain of microphone preamp  
Common mode rejection of input  
Maximum input level  
20, 30 or 40dBv selectable  
90dBv at 60Hz  
0dBv  
Input impedance  
1.2K Ohms  
Maximum output level  
Output impedance  
Headphone output impedance  
Minimum impedance of headphones  
Noise at unity gain  
+22dBv  
80 Ohms T pad on, 22 ohms T pad off  
13 Ohms  
30 Ohms  
-116dBv  
Noise at 40dBv of gain no T pad  
Noise at 30dBv of gain no T pad  
Headroom LED threshold  
Phantom power  
-80dBv  
-89dBv  
0, -12 –24dBv  
+ 48 volts DC  
+8dBv  
Max output of headphones at 30 Ohms  
 

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