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DPX-100
Graphic Equalizer
Compressor/Limiter
Operating Manual
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter
1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 AC POWER REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 MECHANICAL INSTALLATION . . . . . . . . .
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter The lightning flash with arrowhead The exclamation point within an eqilateral symbol, within an equilateral triangle, is triangle is intended to alert the user to the intended to alert the user to the presence presence of important operating and of uninsulated "dangerous voltage" maintenance instructions in the literature
within the product's enclosure that may be accompanying the device.
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter
$! . / / 0%,#12 3!( "#45!,"3 -%(366%3)*"" 3 ". -,"( ∞ 4. MECHANICAL INSTALLATION 5. EQ CONTROLS The DPX-100 mounts in a standard 19 inch 5.1 EQ Boost/Cut equipment rack. The mounting screw threads vary with The individual equalization faders adjust the different rack manuf
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6. COMPRESSOR/LIMITER CONTROLS 6.4 ATTACK TIME 6.1 GAIN The r
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!"" $ : 2*$ #$ !, %A $"6?#%@#4, 3" 78-# %?##1% &' &' # 9 :% #( the double time constant, release from gain reduction af- 6.9 INPUT/OUTPUT METER SELECT ter a brief transient is always fast, with a slower release after a sustained overdrive. While the Gain Redu
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter & '& (
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: #>#1 %3# % 1 %3 7.2 Inputs and Outputs 7.3 Chain The DPX-100 uses two different audio connec- The chain button on the back panel allows the tor types. 1/4" TRS (tip-ring-sleeve) phone jacks, and output of the equalizer to be fed directly to the input of three pin XLR connectors will allow i
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter equalizer effectively, you need to translate your idea of Large Room Equalization the tone you want to produce into a range of numerical frequencies. This is simple after a little practise. Here are Large rooms tend to suffer from multiple reflec- a few references which are useful for starting points: tions with long time delays, long reverberation times, and “ring-modes”, all of which lead to reduced intelligibility - Very low ba
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter if this type of transient doesn’t destroy a speaker outright, Broadcasting it may damage the speaker surround in such a way as to cause mechanical abrasion and future failure. Compression has long been used as a tool to make an audio signal appear louder. A Alternatives For Sound Installations good example is in broadcasting, where com- peting stations with identical transmitters and power at- To install a compressor/limiter in a
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter e. Attack time to 5mS. vocal or instrumental solo in a cluttered mix. The com- f. Release time to 1 Sec. pressor is also a great corrective tool when working with g. Limit switch IN singers whose own dynamic control is less than perfect. A little compression helps to keep their quieter lines from 2. Using a 1/3 octave (31 band) or parametric becoming buried in the mix. Experimentation is highly equalizer, set the EQ controls
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter 9. DESIGN THEORY The summing system in a graphic equalizer is also important. Since there are a number of filters which Graphic Equalizers: The Basics combine to produce the overall response, it is important that the filters not interact (they WILL overlap, but the While most graphic equalizers look very much response of one filter should not modify the response of the same, there are several important differences in the another)
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter out of an audio system, you have to keep your standard dynamic spectrum will be pushed toward the “middle”. operating level as high as possible without risking distor- This is quite different from simple limiting, where only tion. loud peaks are subjected to gain reduction. More than anything else, it is this double-ended effect which dis- GAIN RIDING tinguishes compression from limiting. Compression is further differentiated fro
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter signal before the gain control FET and then amplify it tional measuring techniques. While the VCA is doing its again. Of course this results in less than ideal noise per- job if it has low noise and distortion, the detector must con- formance and imposes a frustrating trade-off: less noise stantly adjust the gain of the audio path in a manner which = more distortion. keeps the level under control while sounding acceptable to the
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter 10. BLOCK DIAGRAM Distorted Sound This will only be caused by too much signal which will show on the Clip LED. If the LED is not flashing, there is an overload some- SIG where else in the signal path. Adjust the rela- tive gain of each component in your chain to keep everything at a comfortable level. 2 CLIP 3 1 EQ 6dB/15dB INPUT Excessive Hum or Noise GAIN 2 -- 3 1 HPF 15 BAND EQ ++ Hum will usually be caused by a ground loop b
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter Max Level . . . . . . . . . . . . . . . . +23dBu When Using Heavy Compression, Background Noise Output Connectors . . . . . . . . . 1/4" Phone Jack, XLR Is Noticeable During Quiet Sections Of The Program Frequency Response . . . . . . . . ±.25dB 20Hz-20kHz As defined in the section on compression, quiet THD (20Hz-20KHz) . . . . . . . . <.01%@+20dBu program material is effectively made louder while loud IM Distortion (SMPTE) . . .
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter 14. DIMENSIONS B Dimensional Drawing for DPX-100 16
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter 15. SCHEMATICS ,QF $XGLR $VKO\ 17 1 2 3 4 5 6 7 8 TIP = INPUT DETECTOR VR2 B100K RING = SEND J3 PEAK BUS 1 C5 E R11 3 U1A C66 GAIN +/- 15db E 68 RELEASE D1 1 R19 R17 R18 4560 VR1 R25 1N4148 2 100K 9.76K 1M 5pF B10K 47P3151 R20 47U 150K INPUT METER C6747U LIMIT R29 100K 6 U3B 3 C3 ATTACK R21 R23 +18 7 2 SW1A R33 4560 VR4 R15 15K 100K 5 1 A1MEG 1K 10K 3.3K 27P R9 THRESHOLD R8 C79 C4 D5 R22 4.99K R24 OUT 4.7K R16 (-20db MIN +41.4
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Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter ,QF $XGLR $VKO\ 18 1 2 3 4 5 6 7 8 C17 C25 C33 C41 .1u .1u .1u .1u T2 T3 T2 T3 R71 R91 R111 R131 VR9 VR10 VR11 VR12 63.4K 39.2K 25.5K 15.8K C18 C26 C34 C42 R70 R90 R110 R130 6 U10B JP25 2 U10A JP26 6 U11B JP27 2 U11A JP28 TO ODD R69 TO EVEN R89 TO ODD R109 TO EVEN R129 E 7 1 7 1 E 63.4K 39.2K 25.5K 15.8K 4560 4560 4560 4560 .1u 5 .1u 3 .1u 5 .1u 3 4.7K 4.7K 4.7K 4.7K JP25/2 JP26/2 JP27/2 JP28/2 R72 R92 R112 R132 7.87K 7
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out Operating Manual - DPX-100 Graphic Equalizer - Compressor/Limiter ,QF $XGLR $VKO\ 19 1 2 3 4 5 6 7 8 OUTPUT LEVEL (db) +18 D29 D38 D37 D36 D35 D34 D33 D32 D31 D30 R151 GAIN REDUCTION (db) E +18 1.5K E -21(G) -18(G) -15(G) -12(G) -9(G) -6(G) -3(G) 0(Y) +3(Y) +6(Y) +18 D49 D48 D47 D46 D45 D44 D43 D42 D41 D40 R159 D28 15K Q7 D39 +20(R) 2N4123 -2(R) -4(R) -6(R) -8(R) -10(R) -12(R) -14(R) -16(R) -18(R) -20(R) R149 R148 (Y) PEAK BUS 1 C76 2.4K 390K R158 Q8 2N4125 D13 47U R161 U21 THRES Q3 1N414
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Operating Manual - DPX-100 Graphic 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. Printed in USA 05/02 DPX100 -0
