Parametric EQ / Preamp
Contents
1. 20 20 kHz 0 1 dB Input attenuator Frequency 3 Bandwidth 3 Cut Boost 3 In Out switch All TRS except for unbalanced output TS TRS jacks are wired balanced tip hot except for the PREAMP input which is wired tip hot ring sleve ground Size 1 5 H X 8 2 W x 6 D chassis 8 5 W x 1 75 H front panel Shipping weight 5 Ibs 16V ac 200 ma Symetrix PS 2 for 110V ac operation Symetrix PS 2EP for 220V ac operation Two unit standard 19 rack mount 1U tall holds two SX200 modules side by side Security cover filler panel Spare 16V ac power supply 6 Repair Information Should you decide to return your SX201 to Symetrix for service please follow the following instructions 6 1 Return Authorization Symetrix will service any of its products for a period of five years from the date of manufacture However no goods will be accepted without a Return Authorization number Before sending anything to Symetrix call us for an RA number just ask we ll gladly give you one call 206 787 3222 weekdays 8am to 4 30 pm pacific time 6 2 In Warranty Repairs To get your unit repaired under the terms of the warranty l Call us for an RA number 2 Pack the unit in its original packaging materials 3 Include your name address etc and a brief statement of the problem Your daytime telephone number is very useful if we can t duplicate your problem 4 Put the RA number on2. Te oni gore le HON Eo 1 2 Using the SX20 I saniser adc ove Det cdua kuikana 2 2 1 Beware Distortion and Noise uuuuuusss 2 2 2 Know What You Are Listening To 2 2 3 Use Wide Peaks Narrow Notches 2 2 4 Tuning the EQ Notch Filter eesssssss 3 3 Connections Controls and Switches 4 3 1 Block Diagram t d teet cr ae 4 3 2 Rear Panel Connectors eeessssssssss 5 3 3 Front Panel Controls and Switches 6 4 Troubleshooting eeeeeeeueeeee 7 5 SDOCITICallOn S sibiaviekbre vinh ibd e bordi ind ihe c 8 6 Repair Information esee 10 6 1 Return AuttlorzatiID ccce fx onc eneen 10 6 2 In Warranty Repairs eeeeeseeeeeeeene 10 6 3 Out of Warranty Repairs eeeeeeeeeees 10 7 SX201 LIMITED WARRANTY 11 8 Lightbulb Replacement Information 12 This page is mostly blank 1 Introduction The Symetrix Model 201 EQ Preamp provides studio quality equalization and notch filtering for line level balanced or unbalanced signals as well as for low level unbalanced signals Three fully parametric bands of equalization are provided with 15dB boost and 30dB cut capability allowing the SX201 to be
3. EXCLUSIVELY AS STATED HEREIN The Symetrix SX201 is designed and manufactured for use in professional and studio audio systems and is not intended for other usage With respect to products purchased by consumers for personal family or household use Symetrix EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE This limited warranty with all terms conditions limitations and disclaimers set forth herein shall extend to the original purchaser and anyone who purchases the product within the specified warranty period Warranty Registration must be completed and mailed to Symetrix Inc within thirty 30 days of the date of purchase Symetrix does not authorize any third party including any dealer or sales representative to assume any liability or make any additional warranties or representation regarding this product performance on behalf of Symetrix This limited warranty gives the buyer certain rights You may have additional rights provided by applicable law LIMITATION OF LIABILITY The total liability of Symetrix Inc on any claim whether in contract tort including negligence or otherwise arising out of connected with or resulting from the manufacture sale delivery resale repair replacement or use of any product will not exceed the price allocable to the product or part thereof which gives rise to the claim In no event will Symetrix
4. The 1 or 10 rule applies here Either the engineer is experienced enough to select the reight bulb for the job or it may require 10 engineers to discuss the various options available No fewer than three of these people will then review products suitable for the trade magazines while four others present discussions of the subject to such venues as regional AES section meetings and rec audio pro audio discussion group on the Internet The remaining three indulge in Internet flame wars blasting the reviews of the first three Ideally a side by side comparison of bulbs will take place One must consider spectral emissions and footcandle data measuring all to confirm manufacturer s claims The type of gas filling the glass bulb and material used for the filament can influence the quality of lamp performance and the psychological effects of color distribution can What was the question again Remember that it only took 20 years to decide that pin 2 was hot 12 Rev 2 0 9 15 94
5. the outside of the box 5 Ship the unit to Symetrix freight prepaid Just do those five things and repairs made in warranty will cost you only the one way freight fee We ll pay the return freight If you choose to send us your product in some sort of flimsy non Symetrix packaging we ll have to charge you for proper shipping materials We won t return the unit in anything but original Symetrix packaging Of course if the problem turns out to be operator inflicted you ll have to pay for both parts and labor In any event if there are charges for the repair costs you will pay for return freight All charges will be COD unless you have made other arrangements prepaid Visa or Mastercard 6 3 Out of Warranty Repairs If the warranty period has passed you ll be billed for all necessary parts labor packaging materials and any applicable freight charges Remember you must call for an RA number before you send the unit to Symetrix 10 Rev 2 0 9 15 94 7 SX201 LIMITED WARRANTY The Symetrix SX201 is designed and manufactured for use in professional and studio audio systems Symetrix Inc warrants that the SX201 manufactured by Symetrix when properly installed used and maintained in accordance with instructions contained in the manufacturer s operator s manual will perform according to the specifications set forth in the operator s manual Symetrix expressly warrants that SX201 will be free from defects in material and wo
6. used for both creative and corrective equalization Overlapping frequency controls cover the audio range from 16Hz to 20kHz Bandwidth is continuously variable from 05 octaves for deep notch filtering to 3 3 octaves for smooth tone shaping With its separate line and preamp inputs the SX201 will handle nearly any signal level The line level input provides both balanced or unbalanced terminations while the preamp input is unbalanced The line level input is intended for use with signals that have already passed through a preamplifier The preamp input provides 30dB gain and is intended for use with low level signals such as those from synthesizers guitars bass guitars or electronic drums The overall input level control allows the operator to set internal signal levels to match boost cut conditions Parametric equalizers are so named because their operating parameters characteristics are variable The SX201 is described as fully parametric because the center frequency the bandwidth and the amount of boost or cut are all user adjustable 1 Center frequency is defined as the frequency measured in Hertz Hz that is at the center of the range of frequencies controlled by the equalizer 2 Bandwidth is defined as the range of frequencies measured in octaves or fractions of octaves that are controlled by the equalizer 3 Boost or cut is defined as the amount of increase or decrease measured in decibels dB that the equ
7. IN MANUFACTURED BY SYMETRIX INC SEATTLE WA USA THIS PRODUCT CONTAINS NO USER SERVICEABLE PARTS What Description POWER 5mm coaxial socket Use Symetrix PS 2 power supply 16V ac 500 mA included with domestic units The PS 2 is both UL and CSA certified Accepts plugs with 2 5mm center pin Switchcraft 760 OUTPUTS Balanced 1 4 inch TRS jack 24 dBm maximum level 200 ohm source impedance matches all balanced inputs Unbalanced 1 4 inch TS jack 18 dBm maximum level 100 ohm source impedance matches all unbalanced inputs INPUTS Preamp 1 4 inch TRS jack 12 dBu maximum level Ring connection on jack connected to ground 20 kilohm input impedance 30 dB gain Balanced Unbalanced 1 4 inch TRS jack 18 dBu maximum level 10 kilohm balanced bridging Disables preamp input jack CAUTION Do not use any AC adapter other than the Symetrix PS 2 Do not short the outputs Do not stick your finger s into a light socket Rev 2 0 9 15 94 5 3 3 Front Panel Controls and Switches FREQUENCY BANDWIDTH CUT BOOST FREQUENCY BANDWIDTH CUT BOOST FREQUENCY BANDWIDTH CUT BOOST Hz OCTAVES dB Hz CTAVES dB Hz OCTAVES dB 0 15 196 6 3K 05 INPUT gt ATTENUATOR a OUT amp 30 MID 15 668 22K 05 HIGH SX201 PARAMETRIC EQ PREAMP What PWR CLIP INPUT ATTENUATOR IN OUT switch FREQUENCY Hz BANDWIDTH OCTAVE CuT BoosT Description Y
8. Inc be liable for any incidental or consequential damages including but not limited to damage for loss of revenue cost of capital claims of customers for service interruptions or failure to supply and costs and expenses incurred in connection with labor overhead transportation installation or removal of products or substitute facilities or supply sources Rev 2 0 9 15 94 11 8 Lightbulb Replacement Information The following information may be useful to you in the event that you have to change a lightbulb Q me ces be How many audio engineers does it take to change a lightbulb What s a lightbulb It s in the manual Didn t you read the manual One so long as he replaces it with an oxygen free bulb Uh first we have to decide if the bulb is wired base hot or thread hot If you just turn the other dimmers down a bit the client won t even notice that the bulb has gone out None Since it s analog leave it broken and replace it with the latest digital bulb from Symetrix First the decision as to whether the bulb should be changed it takes four people at the minimum One person must have excellent communication skills and will present a paper on the subject for consideration by the AES The other three persons set up numerous blind looking tests to determine whether or not anyone really will notice the bulb s state as significant Passing that part of the process it may be necessary to select the proper replacement
9. Owner s Manual Parametric EQ Preamp Symetrix Inc 14926 35th Avenue West Lynnwood Washington 98037 Voice 206 787 3222 800 288 8855 Fax 206 787 3211 Copyright 1988 1994 Symetrix Inc All rights reserved Subject to change without notice Batteries not included This manual will not play in reverse Revision 2 0 9 15 94 Part Number 530100 No part of this manual may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying recording or by any information storage and retrieval system without permission in writing from the publisher Production Information This document was written using Microsoft Word for Windows V2 0 and 6 0 The drawings and graphs in this manual were prepared using Corel Draw V2 0 Autocad V12 and Autoscript V5 then imported into Word for Windows via encapsulated PostScript files All page makeup occurred within Word for Windows Body text is set in Bookman 10pt and Section Heads are set in various sizes of Helvetica Bold Helvetica Narrow was used for Figure and Table captions This manual was printed directly from PostScript files generated by Word for Windows on a Xerox Docutech printer This unique device is actually a laser printer capable of 600 dpi resolution with a page throughput that rivals a high speed photocopier As a result every page is a first generation image Ain t technology grand Table of Contents
10. alizer provides at the center frequency Rev 2 0 9 15 94 1 2 Using the SX201 Care must be exercised when using equalization The general precautions are 2 1 Beware Distortion and Noise When a frequency or group of frequencies are boosted the overall operating level is boosted as well For example 12dB of boost no matter what the frequency increases the SX201 s output level 12dB This kind of boost will reduce headroom by 12dB in every circuit from the SX201 s own line driver to the last device in the signal chain amplifier tape machine mixer or what have you Unless signal levels are very low to begin with the SX201 s input attenuator will probably have to be turned down to compensate for increased levels when the equalizer is used for more than 6dB or 8dB boost On the other hand if the levels within the SX201 are too low to start with using the equalizer for boost may increase noise that already exists in the signal to unacceptable levels If levels are too low reduce input attenuation by turning the input attenuator control clockwise or increase the input level by increasing the output level of the device feeding the SX201 2 2 Know What You Are Listening To Low frequency boost may increase the level of some frequencies that cannot be heard for one reason or another Many high quality microphones are capable of generating substantial output at very low frequencies below 50Hz which cannot be adequately repro
11. duced by most monitor speakers or headphones Be aware that the true effects of low frequency boost may not be audible and may actually result in a muddy or distorted sound 2 3 Use Wide Peaks Narrow Notches In general the human ear prefers wide bandwidth peaks and narrow bandwidth notches Boosting a narrow bandwidth produces a sound usually perceived as offensive while boosting wider bandwidths 7 octave or greater usually results in a sound deemed musical It has also been observed that very few people will notice anything s missing when a narrow bandwidth 3 octave or less is cut even when it s cut as much as 30dB But cuta wide bandwidth and the resulting sound quality is often called empty 2 Rev 2 0 9 15 94 2 4 Tuning the EQ Notch Filter For both boost and cut the SX201 s parametric equalizer notch filter is intended to be put to work on specific frequencies To tune the equalizer use full boost to make the frequency easily heard and identified To find a particular frequency by ear the method used by everyone who doesn t have a real time analyzer turn the cut boost control all the way up to 15dB be very careful of feedback if you are listening on a loudspeaker Set the bandwidth for about 3 octave Tune the frequency control until you distinctly hear the part of the sound you wish to control Then adjust the cut boost control for the appropriate amount of change and readjust the bandwidth contro
12. ellow LED indicates power on Red LED fires just before the onset of clipping To avoid serious distortion reduce input levels if this indicator flashes Sets input signal strength Use this control to reduce input levels if the clip LED flashes Depressing the switch to the IN position puts the SX201 circuitry in line In the out position the balanced unbalanced input is hard wired to the balanced unbalanced output Sets the center frequency for each section of the equalizer Each frequency control has a 5 octave range Sets the range of frequencies that is controlled by the equalizer Variable from 0 05 1 20th of an octave for very narrow notch filter capability to 3 3 octaves for very broad tone shaping capability Sets the amount of cut of boost applied to the frequencies selected with the FREQUENCY and BANDWIDTH controls Provides up to 30 dB cut for deep notch filtering and up to 15 dB boost for tone shaping Rev 2 0 9 15 94 4 Troubleshooting Use the following guide in case of difficulty preferably before calling the factory for assistance Problem No output Distortion or Clipping at the Output Schematic diagram Rev 2 0 9 15 94 Check try this Is the INPUT ATTENUATOR control set too low for the present signal Is the PWR LED lighted Is the PS 2 plugged into a live outlet Is the PS 2 working Check signal at input Is it too high or already distorted Do you have a line le
13. l if necessary To notch out interference like 60Hz hum follow the procedure above to get an approximate setting for the frequency control Then to fine tune the notch for the best possible rejection of the interference turn the cut boost control all the way down to 30dB Very carefully adjust the frequency control for minimum hum Then reduce the bandwidth to about 2 octave and readjust the frequency control for minimum hum Repeat this process until the narrowest possible bandwidth is achieved Rev 2 0 9 15 94 3 3 Connections Controls and Switches 3 1 Block Diagram i LNdLno G3ONVv1vVa v o oo P ees O 193130 do I Q3oNv 1VaNn Q m p DC ME NI NMOHS HOLIMS LNOINI AONANODAYSA HOIH 4ISOO IND HICMWOUNvS AONSDOSu4 AONANDAYS CIN i h 4ASOOS IND HICIWOUNvS AONSDOSu4 AONanodud MOT 4ISOO IND HICMWOUNvS AONSDOSu4 T 9 o A LAdNI GAONVIVENN IVa p oF YOLVNNALLY ANdNI Eo Y A LNdNI di Av3ud Rev 2 0 9 15 94 3 2 Rear Panel Connectors 201 PARAMETRIC EQ PREAMP UNA MMCEDI UNBALANCED BALANCED PREAMP INPUT BALANC OUT OUT 30x POWER dB GA
14. rkmanship for ninety 90 days Symetrix obligations under this warranty will be limited to repairing and replacing at Symetrix option the part or parts of the SX201 which prove defective in material or workmanship within ninety 90 days from the date of purchase provided that the Buyer gives Symetrix prompt notice of any defect or failure and satisfactory proof thereof Products may be returned by Buyer only after a Return Authorization number RA has been obtained from Symetrix and Buyer will prepay all freight charges to return any products to the Symetrix factory Symetrix reserves the right to inspect any products which may be the subject of any warranty claim before repair or replacement is carried out Symetrix may at its option require proof of the original date of purchase dated copy of original retail dealer s invoice Final determination of warranty coverage lies solely with Symetrix Products repaired under warranty will be returned freight prepaid via United Parcel Service by Symetrix to any location within the Continental United States Outside the Continental United States products will be returned freight collect THE FOREGOING WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES WHETHER ORAL WRITTEN EXPRESS IMPLIED OR STATUTORY SYMETRIX INC EXPRESSLY DISCLAIMS ANY IMPLIED WARRANTIES INCLUDING FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY SYMETRIX INC S WARRANTY OBLIGATION AND BUYER S REMEDIES HEREUNDER ARE SOLELY AND
15. vel signal plugged into the PREAMP input jack Check setting of INPUT ATTENUATOR control Turn the control counter clockwise until the clip LED turns off Excessive amounts of EQ may cause distortion Try reducing the setting of the INPUT ATTENUATOR control Available from the factory 5 Specifications Item Line Input Impedance Max input level CMRR Clip Indicator Preamp Input Impedance Maximum input level Connector Parametric EQ Notch Filter Boost Cut Bandwidth Frequency Range per band Low band Mid band High band Output Source impedance Maximum level Residual output noise Signal to Noise Ratio Distortion THD N Specification active balanced bridging greater than 10 kilohms 18 dBu greater than 40 dB 1 kHz red LED fires 4 dB below clipping universal low Z high Z unbalanced greater than 20 kilohms 12 dBu TRS wired tip hot ring and sleeve ground 15 dB 30 dB variable 0 05 octave to 3 3 octaves 16 Hz to 22 kHz in three overlapping bands 5 octaves 16 Hz to 512 Hz 196 Hz to 6300 Hz 686 Hz to 22 kHz active balanced unbalanced 200 ohms balanced 100 ohms unbalanced 24 dBm into 600 ohms balanced 18 dBm into 600 ohms unbalanced 92 dBu 20 kHz bandwidth 101 dB re full output 0 025 2 kHz 18 dBm output Rev 2 0 9 15 94 Frequency Response Controls Connectors Physical Power Accessories RM 2 SC 2 PS 2 Rev 2 0 9 15 94
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