6
di1 DIRECT BOX
 Controls 
Attenuation Switch
The attenuation switch allows an incoming source signal to be attenuated by 20 dB or 40 dB. This is useful for operation with 
very hot signals that would otherwise overload the di1.
Ground Lift Switch
The Ground lift switch enables or disables continuous connection of the input and output ground connection. This is useful for 
helping to eliminate ground loop hum problems that can arise between connected devices. When this switch is in the down 
position, the ground lift is enabled and no ground connection is made between the incoming and output signal.
 Specifications 
POWER REQUIREMENT
9V battery (Battery not included) 
Phantom Power: +18 V DC to +48 V DC 
DIMENSIONS (WITHOUT FEET)
10cm (W) x 10.2cm (L) x 4.5cm (H) 
3.93” (W) x 4.01” (L) x 1.77” (H)
dbx is constantly striving to maintain the highest professional standards. As a result of these efforts, modifications may be 
made from time to time to existing products without prior notice. Specifications and appearance may differ from those listed or 
shown.
Important Note:
Every effort has been made to ensure all information provided in this manual is accurate at the time of writing. 
dbx Professional Products is not liable for any incorrect information contained in this manual and extends no liabilities in regard 
to this manual other than those required by local law.
dbx Professional Products may update the contents of this manual at any time without prior notice. The latest version of this 
manual is available from the dbx website at all times. http://www.dbxpro.com