NOTE: The 1/4” line input section of the combo connector (on the rear of the interface) is never sent to the preamp, however, the interface does sum the 1/4” line-level portion of the combo jack and front-panelinstrument-level input. While the summing of these two 1/4” inputs does not affect either input’s impedance or signal level, it does make it possible to record audio from both inputs simultaneously. If you have connected a line-level device to the rear of the interface but only intend to record from the corresponding instrument input on the front, please make sure that the connected device is not outputting any audio (or is powered off).
Setting Gain Levels
To set gain levels for an analog input, begin by turning the Gain Adjustment Knob (4) for that channel fully counter-clockwise. While the sound source is playing at its loudest levels, slowly turn the knob clockwise until the red clip indicator (3) begins to illuminate. Then, turn the knob counter-clockwise until the clip indicator no longer illuminates. At this point, you should be ready to record with the optimum gain setting.
Please keep in mind that the red LED indicates that your input is clipping (distorting) digitally. This is not the same kind of analog-style distortion found on guitar amplifiers and stomp boxes. Digital distortion is generally considered to be harsh and unmusical and it is recommended that you use these LED meters to avoid this type of clipping.
ProFire 2626 | | | | | | User Guide | 7 |
6 Hardware Controls and Connectors | |
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1.Instrument Inputs (Channels 1/2): These unbalanced 1/4” jacks are used for connecting high impedance instrument-level signals (i.e., electric guitars and basses) to ProFire 2626. When using these inputs, make sure that the Mic/Inst (2) button is set to its “in” position in
order to route the associated instrument input to the preamp.
2. Mic/Inst Buttons: These buttons determine whether the channel’s XLR input (rear-panel combo jack) or the 1/4” instrument input (on the front panel) will be routed to the preamp. When this button is set to the “out” position, the combo jack’s XLR connection will be active and the front panel input will be ignored. Conversely, when this button is set to the “in” position, the channel’s 1/4” front panel input will be active and the combo jack’s XLR connection will be ignored.
3.Signal/Clip Indicators: The green LED indicates
the presence of a signal at the corresponding analog input while the red LED indicates “clipping” or distortion at the input. Use these LED meters to set levels for the eight analog inputs.
4. Gain Adjustment Knobs / 20dB Pads: These are dual function knobs that are used to adjust the preamp gain as well as to engage a 20dB pad. Turn this knob clockwise to increase the input gain for a channel. Pull the knob to the “out” position to engage a 20dB pad or leave the knob in the “in” position to allow signals to bypass the pad.
