User manual PRESONUS DIGITUBE

[. . . ] DigiTUBE Single-Channel Tube Mic-Preamplifier with S/PDIF Output USER'S MANUAL 1. 1 Copyright © 2001, PreSonus Audio Electronics, Inc. ALL RIGHTS RESERVED TABLE OF CONTENTS 1 1. 1 1. 2 2 2. 1 2. 1. 1 2. 1. 2 2. 2 2. 2. 1 2. 2. 2 2. 3 2. 3. 1 2. 4 3 4 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] This is a very useful feature for rapidly reducing the level coming into the DigiTUBE to prevent the input signal from over-modulating (distorting). Padding the mic input serves to provide increased `headroom' for the operator and allow greater variance in adjusting the GAIN control. Placing the switch to the PAD/LINE position allows the XLR connector to accept line level signals. Line level signals can be used in the XLR input without overdriving the input. Keyboards and other line level devices can be inserted into the DigiTUBE XLR input by selecting the LINE position. M ORE Note: the PAD/LINE switch does not affect the 1/4" input of the NeutrikTM connector. The 1/4" input is designed to accept instrument level signals ONLY! 5 2 CONTROLS & OPERATION 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. 1 3 2 PIN 1 = GND PIN 2 = + (+48V) PIN 3 = - (+48V) 2. 1. 2 EQUALIZER SECTION Low (30Hz - 1kHz) +/- 12dB Mid (900Hz - 5kHz) +/-12dB High (3kHz - 15kHz) +/-12dB 80Hz Switch EQ IN Switch Low The LOW control is a dual concentric potentiometer 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 30 1k (0). When the outer control knob is in this position, -12 +12 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 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 frequency changes that occur when the selector travels clockwise past the twelve o'clock position and beyond. LE SS 0 120 E OR M 6 CONTROLS & OPERATION 2 Mid The dual concentric potentiometer labeled MID controls the frequencies from 900Hz to 5kHz. The outer ring provides boost or cut at the frequency selected by the inner knob by plus or minus twelve decibels with the 5k straight-up noon position equal to zero or no boost or -12 900 +12 cut. The inner control knob begins at 900Hz in the left or fully counter-clockwise position and continues to 5kHz in the right or fully clockwise position. This control behaves in the same manner as the LOW control with the frequency widths delineated by the knob's markings becoming wider as the knob travels to the right or the clockwise direction. LE SS 0 2k E OR M LE SS 0 5k -12 3k 15k +12 High The Equalizer dual concentric control labeled HIGH operates in the same manner as the LOW and MID controller. The inner HIGH control knob is used to boost or cut frequencies ranging from 3kHz to 15kHz by as much as 12dB by adjusting the outer ring of the controller. 80Hz Switch The DigiTUBE equalizer section contains a switch labeled 80Hz. Engaging this switch activates an 80Hz filter (often referred to as a rumble filter). This filter is useful for eliminating extraneous low-end sounds from the signal being amplified. This will eliminate low-frequency noises such as air-conditioning hum or the sounds of nearby traffic or other vibrations that may be transmitted through the microphone stand into the microphone. [. . . ] During the warranty period PreSonus shall, at its sole and absolute option, to either repair or replace, free of charge, any product that proves to be defective on inspection by PreSonus or its authorized service representative. To obtain warranty service, the purchaser must first call or write PreSonus at the address and telephone number printed below to obtain a Return Authorization Number and instructions of where to return the unit for service. All authorized returns must be sent to the PreSonus repair facility postage prepaid, insured and properly packaged. PreSonus reserves the right to change or improve the design of the product at any time without prior notice. [. . . ]