Peavey 31 User's Manual
Contents
1. EQ 31 1 3 OCTAVE EQUALIZER OPERATING GUIDE CAUTION TO PREVENT ELECTRICAL SHOCK DO NOT EXPOSE THIS INSTRUMENT TO RAIN OR MOISTURE IBEFORE USING THIS INSTHUMENT READ BACK COVER FOR FUHTHER WARNINGS T BLOCK DIAGRAM This block diagram shows the signal path within the unit In order to thoroughly understand tho unit s functions please study the block diagram carefully PANEL EQUALIZER SECTION Gi bands of 1 30ctavo filters with dual range capability Thefilters are constant Q devices locatedat standard ISO center frequencies Effectiveequalization ranges from 20 Hz to 20kHz Normal operation is 12 dB cut or boost seeRange switch OPERATION NOTE This equalizer is designed to provide room equalization feedback control and system tone control No amount of equalization wil correctan acoustically bad room mic spesker arrangement or completelycorrect tne response curve a poor loudspeaker Always begin with li sliders in he 0 position and avoid excessively cutting largo segmontsof the audio passband which would limit the system s dynamic range Exercise caution when attempting to boost equalization below cut off of speaker system Typical sound reinforce ment enclosures are not designed for 20 Hz performance and transducer damage2. NOTE All specs measured at 1 RMS input and unbalancec Output Ali sliders at mid position all switches out uness otherwiso noted Frequency Response Balanced and Unbalanced Outputs dB 20 Hz 20kHz Distortion 0059 20 Hz 20 kHz Common Mode Rejection Ratio CMRR 36db Typical Input Impedance nbalanced 20K Ohm Balanced 20K Ohms Equal impedances to ground Output Impedance Unbalanceg 100 Ohms Balance 160 Ohns Maximum Input Level Unbalanced 24dBV 158 VRMS Balance 24dBV 15 8 VRMS Maximum Output Level Unbalanced 18d8V 6 VRMS Balanced 24dBV 15 8 VRMS Nominal Input Level Unbalanced 068 1 VRMS Balanced 0d8V 1 VRMS Nominal Output Level Urbalanced 06 1 VRMS Balanced amp dBV 2 VRMS Input Headroom Nominal 24 dB Output Headrcom Unbalanced 18dB Balanced 1868 Output Noise Unbslanced Output EQ Out 9548v EQ In all Flat O5dBv Filter Bandwidth 1 3 Octave Filter Frequencies 2025 31 6 40 50 63 80 100 125 160 200 250 316 100 500 610 800 1K3 28K 16K 2k 2 54 3 16X AK 5K 63K B4 10k 12 5K 16K 20 Maximum Boost amp Cut Filters 32 dB 12 dB Position 7 6 8 6 dB Postion Maximum Boost Cut Gain WideBand Gain 5 12 dB 12 dB Position 22 12 dB 41 6 dB Position High CutFilter 12 48 Per Octave Frequency Max 36 kHz Min ker Due to our efforts for consiant improvement featuras and specificati
3. could result GAIN Calibrated control for regulating overall gain of the equalizer section Unity gain throughout the signal chain may be maintained by recovering lost signal at this point Example Assume tne equalization process has introduced a signal ooo GdB by negative adjustment of the EQ section The gain should then be adjusted to 6 to maintain unity gain through the equalizer LOWCUT Ahigh pass filter continuously variable from 10 Hzto 300 Hz Low frequency roll off is at 12dB per octave Adjust this control to approximate low frequency cut off of speaker system HIGH CUT A low pass filter continously variable from 4 kHz to 35 kHz High frequency roll off is at 12 dB per octave Adjust this control slightly above high frequency system limitation EQ BYPASS In bypass mode the input signal is routed directly to theoutput and isunaffected by all frontpanel controls except iow cut and high cut filters RANGE 6 dB 12 dB Selects the amount of cut or boost availablo with equalizer section Switch position out provides 12 dB range Switch position in provides 6 dB operation POWER SWITCH Depress the switchto the On position The red pilot light LED will illuminate indicating power is being supplied to the unit REAR PANEL 2 INPUT Balanced A three pin female XLR jack is provided for electronically balanced input terminatio INPUT Unbalanced Two 4 ring tip sleeve ste
4. ons listed herein are subject to cnange without notice
5. reo jacks provide balanced inputs when used with stereo RTS 4 plugsand2 conductor ided cables When used with a mono 4 phone plug the input is unbalanced shi OPERATION NOTE Using either of the two inputs with amoro phoneplugunbalances the other 4 input and the XLR input When ore these inputs is used as a y out 19 an unbalancod input on another piece of equipment all the inputs become unbalanced OUTPUT Balanced A transtormer balanced male XLR output provides line balancing to other piec f audio oquipment power amps etc Balanced cutput is recommended for rejection of hum noise and outside interference OUTPUT Unbalanced Two paralled i phone Jacks are provided for unbalanced output termination LINE CORD 120V products only Foryour safety we have incorporated a 3 wire line mains cable witn proper grounding facilities t is not advisable to remove the ground pit under any circumstances If it is necessary to use the equipment without proper grounding facilities suitable grounding adaptors should be used Less noise anc greatly reduced shock hazard exists when the unit is operated with the proper grounded receptacies 0 31 SPECIFICATIONS All apecificatiore are typical unloso othorwiee noted OdBV 1 Volt AIL specifications are referenced to nominal output level OdBV unless otherwise noted AIV measurements are widebard 20 Hz to 20 kHz unless otherwise etated
Download Pdf Manuals
Related Search