Related Manuals for Ashly DPX-100
Summary of Contents for Ashly DPX-100
- Page 1 ASHL Y DPX-100 Graphic Equalizer Compressor/Limiter Operating Manual ASHLY AUDIO INC. 847 Holt Road, Webster, NY, 14580-9103 Phone: (585) 872-0010 Fax: (585) 872-0739 Toll-Free: (800) 828-6308 Internet: www.ashly.com...
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Page 2: Table Of Contents
Table Of Contents 1. INTRODUCTION 2. UNPACKING 3. AC POWER REQUIREMENTS 4. MECHANICAL INSTALLATION 5. EQ CONTROLS 5.1. EQ Boost/Cut 5.2. Gain 5.3. Range 5.4. HPF (Hi-Pass Filter) 5.5. EQ In/Out 5.6. Signal Present and Clip LEDs 6. COMPRESSOR/LIMITER CONTROLS 6.1. -
Page 3: Introduction
SERVICE PERSONNEL. 1. INTRODUCTION The Ashly DPX-100 combines a 15 band graphic equalizer and full function peak compressor/limiter in a single rack space product. Both equalizer and compressor/limiter can be used as stand-alone processors, or can be automatically chained together with a back panel switch. -
Page 4: Unpacking
240 VAC, 50-60 Hz and are shipped with the appropriate power cord. The DPX-100 will perform normally from 95 to 125 volts AC. An internal line fuse is used. In the event of fuse failure, refer to a qualified service technician for servicing. Power consumption is less than 20 watts. -
Page 5: Eq Controls
Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter and does not require removal of the equipment from your rack. See your Ashly dealer for details. 5. EQ CONTROLS 5.1 EQ Boost/Cut The individual equalization faders adjust the boost or cut at each filter frequency. By... -
Page 6: Compressor/Limiter Controls
Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter any equalization can be compared to a "flat" response. This switch does not defeat the high-pass filter. 5.6 Sig and Clip LEDs The signal present LED comes on when a signal greater than -20 dBu arrives at the EQ input. -
Page 7: Attack Time
On other types of program material, a slower attack time may be preferred. An abrupt attack may, on some material, "square off" the top of a waveform, producing a distorted sound. The DPX-100 provides continuously variable attack times from 200 microseconds to 20 milliseconds. -
Page 8: In/Out Switch
Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter 6.7 IN/OUT SWITCH This switch enables you to quickly hear the compressor/limiter in or out of the audio chain. When the switch is in the out position, all limiting and compression controls and functions are bypassed, with the exception of the gain and output controls, which continue to function as straightforward level controls. -
Page 9: Connections And Cables
Ashly TRS balanced connections use the tip as (+) and the ring as (-) signal, with sleeve used for ground. Ashly XLR connectors use pin 2 (+) and pin 3 (-) with pin 1 ground. Inputs are 20 kΩ active balanced using precision 1% kΩ, outputs are 200 Ω... -
Page 10: Chain Switch
7.4 Detector Loop – Ducking The DPX-100 compressor/limiter has a TRS Insert DETECTOR PATCH point which can be used as a "ducking" input, or in conjunction with an equalizer to produce frequency-sensitive limiting. Various uses of the detector patch are discussed under TYPICAL APPLICATIONS. -
Page 11: Graphic Equalizer Applications
70 volt distributed system processor, mixing console channel insert, and frequency sensitive limiting, to name a few. In most cases, the DPX-100 should be the last device before the power amp or crossover, or right before a recording device or transmitter. -
Page 12: Compressor/Limiter Applications
Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter parametric equalizer (such as the Ashly PQX-571or PQX-572) for feedback control is highly recommended. Console Channel Equalization Many mixing consoles provide only simple equalization for individual channels. If your console has channel inserts, you can patch your graphic equalizer into a channel that's being used for something important and use it to tailor the sound of this channel exactly the way you want. - Page 13 Recording The Ashly limiter can be used to prevent tape saturation in analog recording. Also, with modern trends toward inexpensive digital recording, it remains necessary to protect against input overload. With digital recording, the information stored on tape, hard disk, optical disk, etc., is either a 1 or 0, so actual signal level on the tape is not the concern it is...
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Page 14: Special Effects
The Ashly DPX-100 can turn this procedure into a fast, painless job, eliminating loud feedback levels and the possibility of speaker or ear damage. - Page 15 Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter a. Output level control to -20 dB. b. Input Gain control to 0 dB. c. Threshold control to -30 dB. d. Ratio control to ∞ e. Attack time to 5 mS. f. Release time to 1 Sec.
- Page 16 At that moment, the Ashly limiter will reduce overall gain. Frequency response is unaffected, and the sibilant is controlled.
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Page 17: Design Theory
Ashly uses a "Q" enhanced Wein Bridge filter. Because it is asymmetrical design using matched tuning components, the "Q" is easily set and is very stable. - Page 18 Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter Compressor/Limiters: The Need For Gain Control The human ear excels in its ability to detect an extremely wide range of loudness levels, from the quietest whisper to roar of a jumbo jet. When we attempt to reproduce...
- Page 19 Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter reinforcement, a sudden burst of energy through the system can blow fuses or even damage loudspeakers. In addition to the problem of response time with manual gain riding, it also requires your constant attention, which takes you away from more important jobs. The need for a fast-acting, reliable, automatic gain control is answered by limiters and compressors.
- Page 20 Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter Voltage Controlled Amplifiers Early VCA's were based on vacuum tubes with a "remote cutoff" characteristic. The tube would simply change its gain in response to a changing bias voltage. Tubes developed for this purpose did an excellent job, in fact they could exceed the noise and distortion performance of today's best solid state VCA's.
- Page 21 The Ashly VCA The Ashly VCA is an integrated current ratio multiplier circuit. It has low noise (-90 dBv), low distortion(0.05%), excellent response time and tracking and does not suffer from thermal drift.
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Page 22: Block Diagram
Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter devices with seemingly excellent specs which sound very different with real program material applied to them. Peak Or RMS There are several ways of looking at a signal to determine its level. A peak detector... -
Page 23: Troubleshooting Tips
Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter 11. Equalizer Troubleshooting Tips No Audio Output Check AC power - is the pilot light on? Check in/out connections - are they reversed? Are you sure you have an input signal? EQ Controls Do Nothing... -
Page 24: Warranty Information
DPX-100 have balanced inputs and outputs. Noise can also be caused by insufficient drive levels. Make sure you are sending a nominal 0 dBV line level signal to the unit. -
Page 25: Specifications
Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter 13. SPECIFICATIONS Input Type Active Balanced Input Impedance 20 kΩ Balanced, 10 kΩ Unbalanced Max. Input Level +23 dBu Input Connectors 1/4" Phone Jack, XLR Output Type Pseudo-Balanced Output Impedance 200 Ω Balanced, 100 Ω Unbalanced Max. - Page 26 Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter Compressor/Limiter: Gain ±15 dB Ratio 2:1 to ∞ Attack Time 200 μS – 20 mS Release Time 100 mS – 3 Sec Output -∞ to 18 dB Maximum Input Level +23 dBu...
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Page 27: Dimensions
Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter 14. DIMENSIONS Dimensional Drawing for DPX-100... - Page 31 ASHL Y ASHLY AUDIO INC. 847 Holt Road, Webster, NY, 14580-9103 Phone: (585) 872-0010 Fax: (585) 872-0739 Toll Free (800) 828-6308 Internet: www.ashly.com © 2002 by Ashly Audio Corporation. All rights reserved worldwide...