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The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of Presonus BlueTube DP one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.
Unfortunately, only a few customers devote their time to read an instruction of Presonus BlueTube DP. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.
What should a perfect user manual contain?
First and foremost, an user manual of Presonus BlueTube DP should contain:
- informations concerning technical data of Presonus BlueTube DP
- name of the manufacturer and a year of construction of the Presonus BlueTube DP item
- rules of operation, control and maintenance of the Presonus BlueTube DP item
- safety signs and mark certificates which confirm compatibility with appropriate standards
Why don't we read the manuals?
Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of Presonus BlueTube DP alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of Presonus BlueTube DP, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Presonus service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of Presonus BlueTube DP.
Why one should read the manuals?
It is mostly in the manuals where we will find the details concerning construction and possibility of the Presonus BlueTube DP item, and its use of respective accessory, as well as information concerning all the functions and facilities.
After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.
Table of contents for the manual
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Page 1
USERS MANUA L ? 2004, PreSonus Audio Electronics, Incorporated. All rights reserved .[...]
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Page 2
2 PreSonus Limited Warranty PreSonus Audio Electronics Inc. warrants this product to be free of defects in material and workmanship for a period of one year fro m the date of original retail purchase. This warranty is enforceable only by the original retail purchaser. To be protected by this warranty, the purchaser must complete and return the encl[...]
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Page 3
3 1 Overview 1.1 Intro duction 1.2 Features 2 Controls & Connections 2.1 Front Panel Basic Layout 2.2 Preamplifier Section 2.3 Back Panel Basic Layout 3 Operation 3.1 Dynamic Microphones 3.2 Phantom Powered Microphones 3.3 Instrument Input 3.4 Some Thoughts on Vacuum Tubes 4 Technical 4.1 Sp ecifications[...]
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Page 4
4 1. 1 INTRODUCTIO N Thank you for purchasing the PreSonus BLUETUBE DP two c hannel Dual P ath mic/instrument p reamp lifier . This pre amp was designed using state of the art components to deliver crystal clear audio for an infinite period of time. We believe the BLUETUBE DP to be an exceptional sounding unit and an exceptional value. Please conta[...]
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Page 5
5 noise performance and wide dynamic control. This gives the BLUETUBE DP the ability to boost your signal without increasing unwanted backgro und noise. ? Phantom Power. Each channel of your BLUETUBE DP has 48V p hantom power available. When the p hantom power switch is engaged on either channel , power is supplied at a constant rate to that channe[...]
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Page 6
6 input. ? Tube Drive. The BLUETUBE DP provides a Tube Drive poten tiometer on each channel for controlling the amount of saturation produced by the 12AX7 vacuum tube . Greater levels of tube saturation give the signal greater warmth and a richer sound. This works equally well on mics and instruments.[...]
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Page 7
7 2.1 FRONT PAN E L BASIC LAYOUT T he front panel of the BLUETUBE DP has analog VU meters for channel 1 and 2 to the far left and far right respectively , which measure the input level . VU stands for ‘ volume unit ’ , which is an average measurement of the input signal leve l. This means that not all transients will be displayed by the VU mete[...]
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Page 8
8 Phantom Power is available to each channel input of the BLUETUBE DP . The 48 volts is supplied by way of the XLR connector for condenser mics and any other devices requiring continuous power through the XLR input. This power is supplied at a constant level allow ing use of both inputs simultaneously. PIN 1 GND PIN 2 +48v PIN 3 +48v XLR connector [...]
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Page 9
9 signal that you ’ ll need. Tube Drive. The BLUETUBE DP Tube Drive control increases th e amount of saturation produced by the 12AX7 vacuum tube . The Tube Drive can be turned on or off, and t he effect achieved by this procedure can be subtle to extreme, depending on the setting being used. A “ warming up” of the soun d can be noticed with [...]
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Page 10
10 2. 3 BACK PANEL BASIC LA YOUT PIN 1 GND PIN 2 High (+) PIN 3 Low (-) Cable Wiring Diagram for Input and Output XLR The Output XLR Connector is servo balanced and operates at +4dBu. TIP High (+) SLEEVE GND ( -) Ca ble Wiring Diagr am for Input and Output ¼ ” TS Plug The Output ¼” TS Connector is unbalanced and operates at - 10dBv .[...]
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Page 11
11 3.1 DYNAMIC MICROPHO NES Dynamic microphones are characterized by lower output levels. Hence, more gain is needed to amplify a dynamic mic rophone to operating level. Occ asionally it is necessary to engage the – 20dB pad to the microphone to avoid distortion (e.g. when recording percussion). Do not use phantom power when using dynamic microph[...]
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Page 12
12 3.4 SOME THOUGHTS O N VACUUM TUBE S The BLUETUBE DP comes supplied with a 12AX7 vacuum tube that meets or exceeds the stated performance criteria for the unit. We expect some owners of the BLUETUBE DP will try different tubes to investigate the various performance possibilities they might provide. Tube replacement can be easily accomplished by f[...]
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Page 13
4.1 T ECHNICAL SPECIFICAT I ON S BLUETUBE D P Technical Specifications : Number of Channels Two Performance THD + Noise (Unweighted) 0.0 0 5%@0dBTubeDrive 10% @ 100 % Tube Drive Noise Floor - 94dBu Signal to Noise >90dB Power Supply Reject ion >98dB Amplifier Typ e Dual Path Input Connectors Neutrik ? Combo Input Impedance, XLR 1.3 k Ohms Inp[...]