PQX-571 PQX-572 Parametric Equalizer Operating Manual ASHLY AUDIO INC. 847 Holt Road Webster, NY 14580-9103 Phone: (716) 872-0010 Toll-Free: (800) 828-6308 Fax: (716) 872-0739 Internet: http://www.ashly.
Operating Manual - PQX 571 and PQX 572 Parametric Equalizer Table Of Contents 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 AC POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 CONNECTIONS . . . . . . .
Operating Manual - PQX 571 and PQX 572 Parametric Equalizer 1. INTRODUCTION Congratulations on your purchase of an Ashly PQX series parametric equalizer. Like graphic equalizers, parametric equalizers allow you to boost or cut selected frequencies. Unlike graphic equalizers however, parametric equalizers can tune in the exact frequencies you want and control the bandwidth of each selected frequency band, resulting in very precise control of frequency response.
Operating Manual - PQX 571 and PQX 572 Parametric Equalizer 4.3 Grounding The terminal strip has two ground connections, one for input ground and one for chassis ground. The equalizer is shipped with a jumper strap connecting these two grounds. Normally, this strap should be left in place so the chassis and input grounds are connected.
Operating Manual - PQX 571 and PQX 572 Parametric Equalizer High Shelf Level Response Parametric Filter Level Control 5.3 High Shelving Filter (Filter No. 7) These concentric controls work the same way as the low shelf controls described in (1) and (2) except the filter response starts at the center frequency selected and continues up in frequency. 5.4 Parametric Filter Frequency Control Master Level The overall gain of the equalizer is adjusted by this control.
Operating Manual - PQX 571 and PQX 572 Parametric Equalizer Mixer PQX 571 Parametric Equalizer Compressor - Limiter Crossover Power Amplifier Typical Sound System Design 6. TYPICAL APPLICATIONS 6.1 Connecting Into a Sound System Typically an equalizer is used in a sound system which has a mixer or some other sort of preamplifier. In such cases, the equalizer normally should be connected after the mixer but before any electronic crossovers or limiters.
Operating Manual - PQX 571 and PQX 572 Parametric Equalizer 2. With the entire PA hooked up and turned on, slowly increase the sound level at the mixer until feedback is heard, then lower the level by about 3 dB so that feedback does not continue. 3. Start with one of the PQX filters by setting the level at 0, bandwidth set fairly sharp (about .3 oct.), and adjust the frequency control to where you estimate the predominate feedback frequency to occur. 4.
Operating Manual - PQX 571 and PQX 572 Parametric Equalizer 8. TROUBLESHOOTING TIPS 8.5 8.1 No Output Hum will usually be caused by a “ground loop” between components. Try using the suggested balanced input and output connections if the other pieces of equipment used in conjunction with your equalizer have balanced inputs and outputs. Noise (too much hiss) can be caused by insufficient drive signal. Make sure you are sending a nominal 0 dBu line level signal to the equalizer.
Operating Manual - PQX 571 and PQX 572 Parametric Equalizer 10. SPECIFICATIONS (0 dBu = 0.775 volts rms, Balanced input) 10.1 Master Gain Level: 10.12 ±15dB 10.2 Peak Filter Amplitude: 10.3 Peak Filter Frequency Range Range Switch Out 200Hz - 20KHz ±15dB 10.13 Range Switch In: 10.4 20Hz - 2KHz 10.14 Peak Filter Bandwidth: 3 1/3 - 1/20 octave 10.5 Shelving Filter Frequency Ranges (At midpoint of shelving slope) Low: 40Hz - 400Hz High: 1.6KHz - 16KHz 10.14 10.15 10.
Operating Manual - PQX 571 and PQX 572 Parametric Equalizer SCHEMATICS PQX 571, PQX 572 Schematic Diagram 1 of 2 12.
Operating Manual - PQX 571 and PQX 572 Parametric Equalizer PQX 571, PQX 572 Schematic Diagram 2 of 2 11
Operating Manual - PQX 571 and PQX 572 Parametric Equalizer ASHLY AUDIO INC. 847 Holt Road Webster, NY 14580-9103 Phone: (716) 872-0010 Fax: (716) 872-0739 Toll Free (800) 828-6308 Internet: http://www.ashly.com/ 1997 by Ashly Audio Corporation. All rights reserved worldwide.
