DPX-200 Parametric Equalizer Compressor/Limiter Operating Manual 1 Gain 0 +40 +30 Model DPX-200 Parametric Equalizer Compressor/Limiter - ∞ +20 +55 +15 Mic Line Input Select 2 3 4 20Hz - 20KHz 20Hz - 20KHz 1.6KHz - 16KHz Bandwidth Freq. Range Bandwidth Freq. Range Shelving Norm Norm -3 0 +3 1 1K .3 1 1K .3 0 0 ÷ 10 ÷ 10 8K 2K -3 2K -3 4K 4K 4K 315 EQ 1 EQ 2 EQ 3 In In In 8K 8K -15 +15 -15 +15 200 20K 200 20K 40 400 1.6K 16K 3.3 Hz .05 3.3 Hz .
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter Table Of Contents 2 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 AC POWER REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 MECHANICAL INSTALLATION . . . . . . .
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter 1. INTRODUCTION 2. UNPACKING The Ashly DPX-200 combines a four band parametric 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.
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter 1 Gain 0 +4 0 +3 0 3 15 M o d el D P X -20 0 P ar am etr ic E q ualize r C om pr es s or /L im iter - ∞ +2 0 +5 5 +1 5 M ic L in e In pu t S e le c t 2 4 0Hz - 4 00 Hz S he lving -3 0 + 3 2 00 1 00 4 0 4 00 -1 5 H z +1 5 dB Le ve l Fr eq . 2 0Hz - 2 0K H z B and w idth Fr eq . 1 1K .3 2K 4K EQ 1 In 3 .3 -3 0 O cta ve s 1 1K .3 2K 4K EQ 2 In 8K 2 00 2 0K H z .0 5 -1 5 dB 4 3 2 0Hz - 2 0K H z B and w idth Fr eq .
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter Th. 0 -3 -6 +3 +6 -6 -1 0 +1 0 -1 5 dB +15 Gain -1 0 -2 0 -4 0 2 -3 C lip Inpu t/ O utpu t L evel (d B) -18 -15 -12 -9 -6 -3 0 +3 +6 +9 +20 G ain R eductio n (dB ) 6 8 10 12 14 16 18 20 4 0 +3 5 3 +6 +10 + 2 0 2 .5 2 dB +22 Threshold 7 10 ∞ Ratio 2 3 4 .5 5 1 .5 -3 1 .2 -6 10 20 1 3 0 .5 2 .2 mS 20 Attack .
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter AC Model DPX-200 Made In USA 3 2 M ic P h an tom P ow er 1 00 -1 2 0VAC 5 0-60 H z 1 2W Compressor/Limiter CAUTION R isk o f Elec tric S hock.
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter IN P UT S a r e Activ e B ala n c e d . O UTP UT S M a y B e Wir e d B a la n c e d O r Un ba la n c e d . The input meter takes its signal just after the gain control, and will indicate input signal level regardless of output levels or limiter settings. The output meter display takes its signal from the actual output of the unit, so every control that affects the output will also have an effect on output meters.
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter 8. TYPICAL APPLICATIONS By itself, a parametric equalizer is useful for general tone control, feedback control, room resonance correction, individual microphone voicing, and many other applications. The compressor/limiter provides many solutions where dynamic signal level processing is required.
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter a channel that’s being used for something important and use it to tailor the sound of this channel exactly the way you want. Large Room Equalization Large rooms tend to suffer from multiple reflections with long time delays, long reverberation times, and “ring-modes”, all of which lead to reduced intelligibility and a generally “muddy” sound.
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter Broadcasting Compression has long been used as a tool to make an audio signal appear louder. A good example is in broadcasting, where competing stations with identical transmitters and power attempt to sound louder than each other. Since they are all restricted with respect to maximum audio level (modulation), their best tactic is to squeeze the dynamic range of their programs to just a few dB.
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter singers whose own dynamic control is less than perfect. A little compression helps to keep their quieter lines from becoming buried in the mix. Experimentation is highly recommended. Voice-Over Compression (“Ducking”) The compressor/limiter can be used to automatically reduce music to a background level when an announcer is speaking. In this scheme, only the music signal is actually gain-reduced by the limiter.
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter unexpected, transient volume peaks in the music. This safety margin is known as headroom, and may range from 10 to 25 dB. Lowering our standard operating level to leave ourselves some headroom helps prevent distortion, but at the same time it moves our average program level closer to the noise floor, thereby compromising signal-to-noise performance.
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter FET will only act as a pure resistor with very small signals applied so it is necessary to attenuate an input signal before the gain control FET and then amplify it again. Of course this results in less than ideal noise performance and imposes a frustrating trade-off: less noise = more distortion. A number of VCA’s based on the exponential voltage-current characteristic of a bipolar junction transistor have been used.
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter 10.
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter When Using Heavy Compression, Background Noise Is Noticeable During Quiet Sections Of The Program As defined in the section on compression, quiet program material is effectively made louder while loud peaks are made quieter. When the program source is thus raised in volume, its noise floor is also raised in volume by a proportionate amount.
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter SPECIFICATIONS (continued): Compressor/Limiter Gain: .................. Ratio: .................. Attack Time: . . . . . . . . . . . . Release Time: . . . . . . . . . . . Output: . . . . . . . . . . . . . . . . . . Maximum Input Level: . . . . Maximum Output Level: . . Input Impedance: . . . . . . . . Output Impedance: . . . . . . .
1 2 3 4 5 6 8 7 F E E D D C33 R74 10K 47U +18 LEVEL D8 2N4125 Q4 2N4125 F2 IN 40Hz - 400Hz 2 3 1N4148 620 R119 8.66K 68p R54 R63 R67 R58 R59 R68 R69 10K 10K 10K 10K 10K 10K 10K 10K 2 C46 100p R56 2K 3 R55 C35 3.3K 47u 6 U8A 4560 1 5 C37 47u 2 1 4560 3 1 F1 OUT 5 D9 1N4148 U9B 4560 7 PEAK BUS 2 R70 3.3K C38 47u 10K R62 1K R72 10K B OUT OUT SW8B S W-DPDT 5 SW9B S W-DPDT 5 U10A 4560 1 R60 33K C36 47u R61 C10 .001u 4 6 4 6 10.
2 3 4 5 6 Filter One Filter Four Low Shelf E High Shelf 2 6 5 F1 IN U10B 5 4.7K VR11B C100K C41 U7B 6 R75 7 4560 8 7 R91 7 4560 F1 OUT F4 IN 3 U15A C14 R77 .0015u 47u R76 10K C13 .22u C42 U15B 6 1 4560 3.3K E 7 4560 5 F4 OUT 47u 3.3K R79 10K R78 2.7K VR11A C100K VR12A C100K VR12B C100K R90 47K D D Filter Two Filter Three Frequency Frequency R95 R112 10K 10K Range R94 1M C18 C16 Range R111 C22 1M C20 C27 C25 C31 C29 C C .0015u .
1 2 3 4 5 6 8 7 GAIN REDUCTION (db) D43 D42 D41 -4(R) -6(R) -8(R) -10(R) -12(R) -14(R) -16(R) -18(R) -20(R) R149 R148 2.4K 390K -18 -18 GAIN METER J14/2B J14B D R147 1.5K +18 J14C J14/2C +18 -18 J14D J14/2D -18 R162 4.7K METER SELECT 3 5 J14/2F J14G J14/2G J14H J14/2H 0(Y) +3(Y) +6(Y) 45P2600 OUT J13C J13/2C OUTPUT METER R157 R156 100K 100K D11 R155 1K D12 1N4148 1N4148 J13/2D J13D C83 1.
Operating Manual - DPX-200 Parametric Equalizer - Compressor/Limiter 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.
