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Ashly DPX-100 manual

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Table of contents for the manual

  • Page 1

    DPX-100 Graphic Equalizer Compr essor/Limiter Operating Manual ASHL Y AUDIO INC. 847 Holt Road W ebster , NY 14580-9103 Phone: (585) 872-0010 T oll-Free: (800) 828-6308 Fax: (585) 872-0739 Internet: www .ashly .com HP F EQ 20H z Out In Out 10K Gai n dB ∞ +20 +15 +10 +6 +3 0 -3 -6 -10 -20 - .1 .2 .5 1 2 3 Sec 20 .5 .2 20 1 1.5 2 3 5 10 15 mS 2 ∞[...]

  • Page 2

    2 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter T able Of Contents 1 INTR ODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 UNP A CKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[...]

  • Page 3

    3 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter 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 compres- sor/limiter can be used as stand-alone processors, or can be automatically chained together with a back pan[...]

  • Page 4

    4 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter 5. EQ CONTR OLS 5.1 EQ Boost/Cut The individual equaliza tion faders adjust the boost or cut at each f ilter frequency . By adjusting a com- bination of f aders , an over all frequency response can be de v eloped and the physical position of the f aders will gi ve an approximate [...]

  • Page 5

    5 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter 6. COMPRESSOR/LIMITER CONTROLS 6.1 GAIN The Gain control is used to adjust incoming sig- nal le vel to the VCA circuit. It is always acti ve, so switching out the limiter function has no effect on this contr ol. Used in conjunction with the input/output lev el meter display , thi[...]

  • Page 6

    6 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter the double time constant, release from gain reduction af- ter a brief transient is alw a ys fast, with a slo wer release after a sustained o verdri ve. 6.6 OUTPUT LEVEL Output le vel control is provided to fully cut or restore up to 18 dB of system gain. For unity g ain, set the [...]

  • Page 7

    7 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter 7.2 Inputs and Outputs The DPX-100 uses two dif ferent audio connec- tor types. 1/4" TRS (tip-ring-sleev e) phone jacks, and three pin XLR connectors will allow interfacing to most professional audio products. Ashly TRS balanced con- nections use the tip as (+) and the ring [...]

  • Page 8

    8 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter equalizer ef fectiv ely , you need to translate y our idea of the tone you want to pr oduce into a range of numerical frequencies. This is simple after a little practise. Here are a few ref e rences which are useful for star ting points: - V ery low bass (the “wind” in a kick[...]

  • Page 9

    9 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter if this type of transient doesn’ t destroy a speak er outright, it may damage the speaker surround in such a way as to cause mechanical abrasion and futur e failure. Alter nat ives F or Sound Installations T o install a compressor/limiter in a sound sys- tem using a passi v e c[...]

  • Page 10

    10 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter e. Attack time to 5mS. f. Release time to 1 Sec. g. Limit switch IN 2. Using a 1/3 octave (31 band) or parametric equalizer , set the EQ controls to a flat setting, and if the equalizer has an o ve rall volume control, boost it by 10 to 15 dB. 3. Open up se veral microphone inpu[...]

  • Page 11

    11 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter 9. DESIGN THEORY Graphic Equalizers: The Basics While most graphic equalizers look ver y muc h the same, there are se veral important differences in the circuitry used to implement v a rious designs. Perhaps the major dif fe rences are in the f ilters . Some equalizers use a fil[...]

  • Page 12

    12 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter dynamic spectrum will be pushed to ward the “middle”. This is quite diff erent fr om simple limiting, where only loud peaks are subjected to gain reduction. Mor e than anything else, it is this double-ended effect which dis- tinguishes compression from limiting. Compression [...]

  • Page 13

    13 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter signal before the gain control FET and then amplify it again. Of course this results in less than ideal noise per- formance and imposes a frustrating trade-off: less noise = more distortion. A number of VCA ’ s based on the exponential v olt- age-current characteristic of a bi[...]

  • Page 14

    14 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter 10. BLOCK DIA GRAM 11. Equalizer T roubleshooting T ips No A udio Output Check A C po wer - is the pilot light on? Check in/out connections - are they re versed? Are you sure you have an input signal? EQ Contr ols Do Nothing Is the master EQ switch in? The lo west and highest fr[...]

  • Page 15

    15 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter When Using Heavy Compr ession, Background Noise Is Noticeable During Quiet Sections Of The Pr ogram As defined in the section on compr ession, quiet program material is ef fectiv el y made louder while loud peaks are made quieter . When the program source is thus raised in v olu[...]

  • Page 16

    16 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter 14. DIMENSIONS Dimens ional D rawing for DP X -100 0. 1 0 6. 0 0 17.00 1. 2 5 1. 7 5 0. 7 5"[...]

  • Page 17

    17 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter 15. SCHEMA TICS 123456 78 A B C D E 8 7 6 5 4 3 2 1 E D C B A B APPROVED: Dw g # Size Drawn B y Rev. C S:En g ineerin g CLIENT98155110s1551c-1.Sch 10S1551 DPX-100 MINI-EQ + COMPRESSOR/LIMITER James B Franks Sheet # of 14 847 Holt Road Webster, NY 14580-9103 Phone: Fax: (716)[...]

  • Page 18

    18 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter 1 2 3 4 5 6 78 A B C D E 8 7 6 5 4 3 2 1 E D C B A B APPROVED: Dw g # Size Drawn B y Rev. C S:En g ineerin g CLIENT98155110s1551c-2.SCH 10S1551 DPX-100 MINI-EQ + COMPRESSOR/LIMITER James B Franks Sheet # of 24 847 Holt Road Webster, NY 14580-9103 Phone: Fax: (716) 872-0010 ([...]

  • Page 19

    19 Operating Manual - DPX-100 Gr aphic Equalizer - Compr essor/Limiter 123456 78 A B C D E 8 7 6 5 4 3 2 1 E D C B A B APPROVED: Dw g # Size Drawn B y Rev. C S:En g ineerin g CLIENT98155110s1551c-3.SCH 10S1551 DPX-100 MINI-EQ + COMPRESSOR/LIMITER James B Franks Sheet # of 34 847 Holt Road Webster, NY 14580-9103 Phone: Fax: (716) 872-0010 (716) [...]

  • Page 20

    Printed in USA 05/02 DPX100 -0 Oper ating Manual - DPX-100 Graphic Equalizer - Compr essor/Limiter ASHL Y AUDIO INC. 847 Holt Road W ebster , NY 14580-9103 Phone: (585) 872-0010 Fax: (585 872-0739 T oll Free (800) 828-6308 Internet: www .ashly .com  2002 by Ashly Audio Corporation. All rights reserved worldwide.[...]