Originally Posted by Oliver Deplace
From Stereodude's post, I gather that you'll get a 4V balanced output from a 4V unbalanced input.
Since that output voltage is twice what is specified and runs counter to the mfr's. documentation, I'll apply the obligatory - YMMV.
In the balanced 2x4 product brief
, it specifies maximum output as "2Vrms (5.6Vpp) from + to ground, i.e. 14dBu in balanced mode". So they spec it in a weird way, from one output leg to ground, rather than differentially between the two output legs, which would give you twice the voltage (4 Volts RMS). As a further check, you can compute dBu as follows:
dBu = 20 * log10(VRMS / sqrt(0.6))
Solving for VRMS, you get:
VRMS = sqrt(0.6) * 10^(dBu / 20)
Setting dBu = 14 per the spec above, you get:
VRMS = 3.88 Volts
That's a slight discrepancy: 4 VRMS is really 14.26 dBu.
Bottom line: If you take the output single-ended, you lose 6 dB.