Universal Audio 4-710d Operations Instructions download pdf (Page 9)

Front Panel Descriptions

Analog Controls

(1) Hi-Z Inputs - Connect a high impedance signal from an instrument such as electric guitar or bass

to these standard unbalanced 1/4" phone jack connectors. The 4-710d’s jack detection circuitry

automatically switches from the selected rear panel MIC or LINE input to the channel’s front panel Hi–

Z input whenever a plug is inserted into this jack. The Hi-Z input impedance is 2.2MΩ for all four

inputs. These JFET direct inputs provide maximum fidelity with no high-end loss.

(2) Gain - Adjusts the gain of the channel’s input stage. Turning this knob clockwise raises the

amount of gain applied to the input signal. This control also determines the level sent to the

compressor if the compression circuit ( #13 on page 11) is engaged.

(3) Blend (“∞”) - This unique control sets the relative contribution from the solid-state and vacuum

tube preamplifier circuits. When in the fully counterclockwise (TRANS) position, only signal from the

solid-state preamplifier is heard. When in the fully clockwise (TUBE) position, only the signal from the

tube preamplifier is heard. At the twelve o’clock position, signal from both the solid-state and tube

preamplifiers is heard at equal amounts.

 Making a connection to the 4-710d’s front panel Hi-Z input jack automatically disconnects

any signal arriving at the rear panel mic and line input.

 The controls for channels 1-4 are identical, so each control is only described once.

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Universal Audio 4-710d Operations Instructions Page 9