Manual

8
Level
The Level knob is the master volume control. It determines the amount of signal from the
preamplifier gain stage sent to the output stage. The cleanest signal is attained by setting
the Level knob between 7 and 10 on the scale, then turning the Gain knob until the
desired level is attained. Altering the Gain, Impedance, and Output controls together
provides many useful tonal variations. The numeric values on the front panel for the
Level control denote magnitude and are NOT specific dB values.
Pad
The front panel toggle switch labeled PAD will attenuate the Mic input level by 15dB
when the switch is “up”. When undesired distortion is present at low gain levels it is
recommended to engage the Pad switch.
Polarity
The front panel toggle switch labeled IN ∅ and OUT ∅ determines the polarity of the
LINE OUTPUT. When IN ∅ is selected, pin 2 is hot (positive). When OUT ∅ is
selected, pin 3 is hot (positive).
EQ Controls
The 610B has both low and high frequency shelving-type equalizers, each with two
controls:
• Frequency: This toggle switch selects the corner frequency (Hz). High: 4.5K, 7K,
10K; Low: 70, 100, 200
• Boost/Cut: This rotary switch selects the amount of boost or cut applied to the
frequency “shelf.” The positive and negative numbers on the front panel denote dB
values.
Meter Function
The VU meter can be used to indicate 610B preamp output, 1176LN gain reduction or
1176LN output level. The Meter function is determined using the three position knob to
the left of the meter. When PRE is selected, a meter reading of 0 corresponds to an
output level of +4 dBm at the 610B Preamp output.
+48 V (Phantom Power)
Most modern condenser mics require phantom voltage to operate and we recommend
checking the requirements of your microphones before connecting them. It is good
practice to keep phantom power off (switch down) when it is not required. To avoid loud
transients, always keep the phantom power off when connecting or disconnecting
microphones.
Join / Split
The center section toggle switch labeled JOIN / SPLIT allows separate use of the 610B
preamp and the 1176LN limiter. When the switch is “down” in the SPLIT position, each
side of the 6176 is a separate device with associated in / out connections on the rear
chassis. When the switch is “up” in the JOIN position, the 6176 behaves like a channel
strip with the 610B output routed to the 1176LN internally. In this position, the 610B rear
chassis output XLR is automatically disconnected.