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Input Select
The input select switch determines which input is active: Mic, Line, or Hi-Z. Both the Mic and Hi-Z
inputs include two settings to select between unique input impedances.
Mic
Selects the signal input from the balanced rear panel MIC INPUT connection. The impedance for the
MIC INPUT can be set to 500 or 2.0K . Switching between these two positions while listening to a
connected microphone may reveal a different tonal quality and/or gain difference. Typically a
microphone preamplifier should have input impedance roughly equal to about 10 times the
microphone output impedance. For example, if your microphone has output impedance between 150
and 200 , set the switch to the 2.0K position. However, since making music is not necessarily about
adhering to technical specifications, feel free to experiment with the settings to attain the desired
sound. You will not harm your microphone or the 2-610.
Hi-Z
Selects the signal input from the unbalanced front panel Hi-Z ¼" connection. The impedance for the
Hi-Z input can be set to 47K
or 2.2M
and is intended for electric guitar, electric bass, or any
instrument with a magnetic or acoustic transducer pickup. The 47K
setting is best suited for -10
dBv level signals, typically found on active basses and guitars. The 2.2M
setting is appropriate for
instruments with passive pickup systems. Since an instrument's output impedance may be somewhere
between the active and passive levels, feel free to experiment to achieve the best sound at the desired
level.
Line
Selects the signal input from the balanced rear panel LINE INPUT connection. LINE INPUT has an input
impedance of approximately 13K
and is intended to accommodate mixers, tape machines, other mic
preamps or any device with a line level output, such as keyboards, sound modules and drum
machines. The 2-610 may be used as a "tone box" in this configuration, offering a variety of sonic
colors based on the front panel control settings.
Gain
Adjusts the gain of the input stage in 5 dB increments. Turning the Gain switch clockwise reduces the
negative feedback, which raises the gain. In addition to changing the input volume, the Gain switch
also alters the amount of the input tube's harmonic distortion, a major contribution to the warm sound
characteristic of tube equipment. The greater the gain, to more color the 2-610 will impart to the
recorded signal.
Level
The Level knob determines the amount of signal from the preamplifier gain stage sent to the output
stage. For the cleanest, most uncolored signal from the 2-610, set the Gain switch to a lower setting
(-10 or -5) while turning the Level knob until the appropriate output signal is attained. Altering the
Gain, Impedance, and Output controls together provides many useful tonal variations.
Note: The numeric values for the Level knob are NOT specific dB values.
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