Presonus Audio electronic Single-Channel Tube user manual Input, EQ in Switch, Low

2 CONTROLS & OPERATION

12

3

PIN 1 = GND

PIN 2 = + (+48V) PIN 3 = - (+48V)

Input

Phantom power is available through the XLR input of the DigiTUBE. This 48V of phantom power is for condensor mics and/or any other devices that may require it via XLR inputs.

2.1.2EQUALIZER SECTION Low (30Hz - 1kHz) +/- 12dB Mid (900Hz - 5kHz) +/-12dB High (3kHz - 15kHz) +/-12dB 80Hz Switch

EQ IN Switch

				Low
	S	0	M	The LOW control is a dual concentric potentiometer
		120
			O
	S		R
L	E		E	with the outer ring allowing the selected frequency to
				be boost or cut by as much as twelve decibels. The
				straight up, twelve o’clock, position is labeled zero
		-1230	1k+12	(0). When the outer control knob is in this position,
				no effect is exerted on the signal, regardless of what

frequency is selected with the inner controller. Rotating the outer control knob to the left or counter-clockwise reduces the selected frequency. Rotating the outer controller to the right or clockwise increases the selected frequency. The inner control knob selects the frequency. The LOW EQ control goes from 30Hz to 1kHz. The control frequency is narrower to the fully counter-clockwise or left side. As the inner control is rotated clockwise, the frequency bandwidth is much more broadly defined.

For example, from the fully counter-clockwise position of 30Hz to the first mark represents a difference of 10Hz - 15Hz whereas from fully clockwise or 1kHz to the first marked position back represents as much as a 100Hz difference. The significance of this to the operator is that a movement of the frequency selector from a fully counter-clockwise position to approximately the twelve o’clock position represents smaller incremental frequency changes compared to the fre- quency changes that occur when the selector travels clockwise past the twelve o’clock position and beyond.

6