User manual PRESONUS BLUETUBEDP

[. . . ] This warranty does not cover claims for damage due to abuse, neglect, alteration or attempted repair by unauthorized personnel, and is limited to failures arising during normal use that are due to defects in material or workmanship in the product. Any implied warranties, including implied warranties of merchantability and fitness for a particular purpose, are limited in duration to the length of this limited warranty. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. In no event will PreSonus be liable for incidental, consequential or other damages resulting from the breach of any express or implied warranty, including, among other things, damage to property, damage based on inconvenience or on loss of use of the product, and, to the extent permitted by law, damages for personal injury. [. . . ] This switch enables the user to invert the polarity of a microphone if phase cancellation is noticed when using identical microphones in close proximity to one another. The polarity reversal switch also can compensate for different XLR connector hookups where pin connections have been inverted. A -20dB pad is available on each channel for reducing the in-coming signal level. This pad provides a more manageable signal from high output devices giving the operator greater control over the incoming signal and a much reduced chance of overdriving the input and thereby avoiding distortion. A rumble filter is available to eliminate low frequency noise. This lets you greatly reduce background noise such as air conditioners or wind noise with the flick of a switch without effecting the desired frequencies. Each channel of the BLUETUBE DP has a separate Neutrik Combo?XLR / ¼ inch connector is provided on the back of the chassis for signal input from microphone XLR or instrument ¼ inch ? ? ? ? 5 input. ? Tube Drive. The BLUETUBE DP provides a Tube Drive potentiometer 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. 6 2. 1 FRONT PANEL BASIC LAYOUT The 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 level. This means that not all transients will be displayed by the VU meter. ? +48V Switch Polarity Reversal Switch -20dB Pad 80Hz Filter Gain Control (0 to 54dB) Tube Drive Control (0 to100%) 2. 2 PREAMPLIFIER SECT I O N 7 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 allowing use of both inputs simultaneously. PIN 1 GND PIN 2 +48v PIN 3 +48v XLR connector wiring for Phantom Power Polarity Reversal Switch. This allows the user to invert the polarity of the XLR connector by switching pins two and three. The inversion of the pins of the XLR connector may be necessary to alter the audio phase of two like microphones to compensate for phase cancellation. It may be required that the wiring of a cable' XLR connector be switched to s successfully utilize Phantom power. -20dB Pad. This provides -20 decibels of attenuation with the push of a button. This is a very useful feature for rapidly reducing the level coming into the BLUETUBE DP and thus preventing the input signal from overmodulating (distorting) the input. [. . . ] Tube replacement can be easily accomplished by first unplugging the unit from the electrical outlet and removing the screws which attach the top to the chassis. The tube is mounted in a transverse fashion and care should be taken to properly align the pins on the tube to the corresponding holes in the receptacle. Make sure the tube is completely seated in the receptacle and replace the top of the unit before restoring power to it. Remember: Tube life and performance are affected by how often a tube is used and by how hard the tube is driven when in use. [. . . ]