User manual PRESONUS EUREKA

[. . . ] EUREKA MICROPHONE PREAMPLIFIER COMPRESSOR PARAMETRIC EQUALIZER USER' MANUAL S v ersion 1. 0 ?2003, PreSonus Audio Electronics, Incorporated. All rights reserved. WARRANTY 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 from the date of original retail purchase. [. . . ] XLR connector wiring for Phantom Power Pin 1= GND Pin 2= +48V Pin3= +48V PAD: Engaging the Pad switch provides -20dB of attenuation with the push of a button. This is a very useful feature for rapidly reducing the level coming into the EUREKA and thus preventing the input signal from over-driving (distorting) the input. This may occur due to high output level from a microphone or other device. Padding the input serves to provide increased " headroom"for the operator while lessening the likelihood of input signal overload. 80Hz: The 80Hz button is a low-end roll-off filter. When pushed in, the 80Hz button causes all frequencies below 80Hz to be attenuated (dropped) by 12dB. This filter can be handy in live and studio applications. For example, the 80Hz filter can help to reduce the " boominess"or "muddiness"of a vocal and improve the overall clarity. Ø (Phase Reverse): Reverses the polarity of the signal. Use the phase reverse when recording with more than one open microphone to combat phase cancellation between microphones. When an instrument is plugged into the instrument input, the microphone preamplifier is bypassed and the Eureka becomes an active instrument preamplifier. 2. 3 COMPRESSOR 10 CONTROLS & CONNECTIO NS THRESHOLD: Sets the level at which compression begins. The below and above LED' over the Threshold knob indicate whether the input signal is s below or above the Threshold setting. When the signal is above the Threshold setting, it becomes ` eligible' for compression. Basically, as you turn the Threshold knob counter-clockwise, the input signal is compressed. (If you have a ratio setting of greater than 1:1. ) RATIO: Sets the compression slope. This is defined as the output level versus the input level. For example, if you have the Ratio set to 2:1, any signal level above the Threshold setting will be compressed at a compression ratio of 2:1. This simple means that that for every 1dB of level increase into the compressor, the output will only increase ½ dB, thus producing a compression Gain reduction of 0. 5 db. As you increase the Ratio, the compressor gradually becomes a limiter. A limiter is defined as a processor that limits the level of signal to the setting of the Threshold. For example, if you have the Threshold knob set at 0 dB, and the Ratio turned fully clockwise, the Compressor acts as a Limiter at 0 dB. The Q on the Eureka ranges from 0. 4 (wide) to 2. 0 (narrow). [. . . ] <0. 005% THD + Noise (Full Saturation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0. 5% Microphone Input Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XLR Mic Input Impedance (selectable). . . . . . . . . . . . . . . . . . 2. 5K, 1. 5K, 600, 150, 50 Ohms Instrument Input Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ¼"TS Instrument Input Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Meg Ohm Send Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1/4"TRS Balanced/Unbalanced Send Output Impedance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]