User manual ART 311

[. . . ] 5 High Output Level Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Phase Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Sub Output Level Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Subwoofer Frequency Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] LOW CUT FILTER SWITCH The Low Cut switch activates a 30Hz high pass filter. There is one for each of the Low Outputs and 1 for the Subwoofer Output. This filter is a 2-pole Butterworth design (12dB/octave). Its response reduces spurious subsonic frequencies, which tightens up the low end and helps to protect your amplifiers and speakers. CROSSOVER FREQUENCY CONTROL Each channel of the 311 has a crossover Frequency control to set the crossover point for the high and low frequencies. All frequencies below the set frequency will be sent to the Low output and all frequencies above the set frequency will be sent to the High output. -5- The main crossover filters are 4-pole Linkwitz-Riley designs (24dB/octave). This yields a sharp rolloff to help protect speakers and the outputs sum to a flat response. HIGH OUTPUT LEVEL CONTROL Each channel of the 311 has a High Output Level control. These controls are used to trim the output levels to the High Output Jacks on the rear of the unit. They cover the range of ­30dB to +10dB of output gain trim, as indicated on the front panel. In most cases you would set them to 0dB, for flattest response from the Crossover. You can use these controls to compensate for amplifier gain variations or efficiency of your speakers. PHASE SWITCH The Phase switch is used to switch the polarity (invert the phase) of the signal going to the High Outputs. Normally you would leave this switch in the Norm position. Putting the switch in the Invert position may be done to help correct audible phase related problems. SUB OUTPUT LEVEL CONTROL This control is used to trim the audio output level to the Subwoofer Output Jack on the rear of the unit. This signal is used to provide extra bass via a mono subwoofer in your system. SUBWOOFER FREQUENCY CONTROL The Subwoofer Frequency control sets the crossover point for signals going to the Subwoofer Output. For this function, both of the input channel signals are combined and frequencies below the set frequency will be sent to the Subwoofer Output. This is in addition to the normal signals that are sent to each of the channels other outputs. -6- CONNECTIONS It is easy to interface the unit with a wide variety of equipment. The rear panel has balanced XLR and ¼" inputs as well as unbalanced ¼" outputs. XLR INPUT JACKS (REAR) The XLR input connections are balanced and follow the AES standard for wiring: Pin 1 = Ground, Pin 2 = Hot (+), Pin 3 = Cold (-). [. . . ] ART reserves the right to make changes in design or make additions to or improvements upon this product without any obligation to install the same on products previously manufactured. ART shall not be liable for any consequential damages, including without limitation damages resulting from loss of use. Some states do not allow limitations of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specific rights and you may have other rights, which vary, from state to state. [. . . ]