BSS Audio DPR-404 Owner's Manual - Manual (Page 26)

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Specifications
Side chain insert: Rear panel RTS jack accesses side chain for inserting other equipment at line
level. Connections are:
Ring: Signal output from 470 ohms source
Tip: Return input into 10kohms
Sleeve: 0v ground
Power: AC 50/60Hz 120v/240v switched externally giving operation range of 90-132v
and 180-264v. Anchored 2m power cord
Size: 482 x 44 x 282mm
19” x 1U x 11.10"
Weight: 4.1kg gross shipping
Options
Transformer balancing for input and output.