Level in dBV 0 dBV = 1 volt without reference to impedance. NOTE that this system is usually used with hi-z or high impedance circuits	Voltage measured RMS	Level in dBu or dBm 0 dBu = 0.775V unterminated 0 dBm = 0.775V across 600ohm impedance
+6.0	2.0	+8.2
+4.0	1.6	+6.2
+1.78	1.23	+4.0
0.0	1.00	+2.2
-2.2	0.775	0.0
-6.0	0.5	-3.8
-8.2	0.388	-6.0
-10.0	0.316	-7.8
-12.0	0.250	-9.8
-12.2	0.245	-10.0
-20.0	0.100	-17.8
source: Table 3-3 Sound Reinforcement Handbook writeen for Yamaha by Gary Davis and Ralph Jones rev.4 9/25/1987