Black Lion Audio B173 500 User Manual Download Page 6

To reduce the risk of fire or electric shock, the user should not attempt to repair the device 
in the event of a failure.  Repairs should be referred to qualified service personnel only.  
Please contact Black Lion Audio if you need assistance.

REPAIR

We extend a two-year warranty on defects in materials and workmanship for all Black Lion 
Audio products from the date of purchase.  This does not cover user error, wear, tear, or 
abuse.  Should your B.L.A. product experience any problems or failures during the warranty 
period, immediately contact us, and we will gladly correct the issue at no charge (excluding 
shipping).

WARRANTY

For your safety, please read the following!

Grounding: For your safety, do not defeat the grounding connection.  Use the device only 
when it is properly grounded.

Liquids, water, and moisture: The device should not be used near water, or when it is wet.  
Care should be taken so that it remains dry.  Be sure to keep the device away from rain or 
other moisture.

Power: The device must be loaded in and powered by a 500 Series rack

DISCLAIMER

SIGNAL FLOW/HARDWARE BLOCK DIAGRAM 

“GAIN” is a 12-position, stepped switch ranging from +12dB minimum gain to +80dB 
maximum gain. The majority of the gain for the microphone input comes from the mic amp 
gain stage. The signal passes through an input transformer before going to the mic amp 
gain stage, which is controlled by the “GAIN” rotary switch on the front panel. The signal 
then passes to the Hi-Z switch, which selects which input signal (mic or Hi-Z) goes to the 
output amplifier. The “OUT LEVEL” pot attenuates the signal before going to the output 
amplifier, which in turn goes to the output transformer (see chart below):

500 Series

rack XLR

input

 

Hi-Z Input

 

Circuit

Hi-Z/Mic

 

Switch

User Manual

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