User Manual

7
Volume 8
Unbalanced Connections (i. e. RCA, TS Jack)
You can establish unbalanced connections easily and without adaptors –
for example from CD-Players with RCA outputs or to (HiFi) power ampliers
with RCA inputs. It is important to pay attention to the correct polarity of the
three XLR wires. Connections to RCA and TS Jack inputs or outputs are always
unbalanced. Connections to TRS inputs or outputs may be balanced or unbal-
anced. In any case we recommend to use readily congured cables from XLR
to the respective RCA or TS/TRS connector to dispense with adaptors. Ask
your dealer for congured cables. With the XLR pin wiring information from
the previous page any audio expert can ensure to select or congure the right
cables for connections from the 2Control to any other device.
Volume Control
The single volume potentiometer controls volume for both channels. The
audio signal is controlled directly by the potentiometer—thus no VCA or DAC
regulators in the paths which tend to produce bigger tolerances and distor-
tions.
Calibrating the Monitoring System
Both the signal level which is send to the Volume 2 controller as well as the
input sensitivity of the power amps or active speakers should be matched to
ensure a proper overall gaining. An inappropriate adjustment might happen
when, for example, a (fairly small) 10% volume level setting might already
result in an extremely high playback level.
Important: You can encounter very loud signals during calibration, so be sure
to keep your ear protection on. For calibration we recommend measurement
with a Real Time Analyzer (RTA) or a SPL Meter (in this case, SPL translates to
“Sound Pressure Level“). First the measuring machine and microphone are
set up at the listening position. Then one produces in the DAW a sound le
with “pink noise”, which is played back and measured.
Each measurement should be done through one channel and loudspeaker
at a time. A recommendable calibration is the playback of a 83db SPL refer-
ence signal at the playback location—a common reference volume level. The
DAW output level should be adjusted to 0 dB, and next, the power amp‘s or
active speaker‘s input level should also be set to 0 dB. Now the Volume 2 level
control is adjusted until the RTA or SPL Meter measures 83 dB with the pink
noise playback. For a perfectly matched gaining the Volume Control would
now be set above a 50% scale position. At this point one can record or note the
exact value for 83 dB. Should this 83 dB SPL occur markedly above a 60-80%
scale position, one should lower the power amp’s/active speaker’s input
sensitivity (=higher dB value). On the other hand, the power amp’s/active
speaker’s input sensitivity should be raised if the 83 dB SPL point is reached
far before the 60% control level. In cases where regulating power amp/active
speaker inputs is not enough, one may reach good values by changing the
D/A converter output level (for example from +4 dB to 0 or -10 dB in cases
where this switch option may exist). In any case, the converters should always
be driven at full scale from the DAW.
Rear Panel
Operation