SWA1801z Active Subwoofer System User`s Manual
Contents
1. 10 20 50 100 200 500 1k 2k 5k 10k 20k Frequency Hz SWA1801z Limited Warranty Please keep your sales receipt in a safe place A LOUD Technologies Inc warrants all materials workman ship and proper operation of this product for a period of three years from the original date of purchase You may purchase an additional 24 month Extended Warranty for a total of 60 months of coverage Visit our website and follow the Product Registration links for details www mackie com If any defects are found in the materials or workmanship or if the product fails to function properly during the applicable warranty period LOUD Technologies at its option will repair or replace the product This warranty applies only to equipment sold and deliv ered within the U S and Canada by LOUD Technologies Inc or its authorized dealers B For faster processing not to mention a free gift register online or mail in the product registration card C Unauthorized service repairs or modification of Mackie products will void this warranty To obtain repairs or replace ment under warranty you must have a copy of your sales receipt from the authorized Mackie dealer where you pur chased the product It is necessary to establish purchase date and determine whether your Mackie product is within the warranty period D To obtain warranty repair or replacement 1 Call Mackie Technical Support at 800 898 32112. SWA1801z Be SWA1801z Plays the Low Power Plays the Low Power Frequencies Cords EnH Frequencies Cords SWA1801z Power SWA1801z Power Plays the Low Cord Plays the Low Cord Frequencies Frequencies 2 SWA1801zs WITH 2 SA1521Zs 2 SWA1801Zs WITH STEREO AMPLIFIER AND 2 C3007s SRM450 SRM450 C300z C300z Plays the Mid and Plays the Mid and Plays the Mid and Plays the Mid and High Frequencies High Frequencies High Frequencies High Frequencies SWA1801z Line Level Plays the Low Hi Pass Frequencies Out R Line Level Hi Pass Out SWA1801z Plays the Low Stereo Power Frequencies Amplifier 1 SWA1801Z WITH 2 SRM450s 1 SWA1801Z WITH STEREO AMPLIFIER AND 2 C3007s CONNECTIONS The SWA1801z has two female XLR in puts that accept a balanced line level signal When connecting a balanced signal be sure it s wired per AES Audio Engineering Society standards XLR Hot Pin 2 Cold Pin 3 Shield Ground Pin 1 eee Balanced XLR Connectors If connecting an unbalanced signal to the SWA1801z balanced input be sure that the signal high hot connection is wired to Pin 2 and the unbalanced ground connection is wired to the low and the ground connec tions of the balanced input Pins 3 and 1 If there are ground loop problems try con necting the unbalanced ground connection only to the input low connection Pin 3
3. SWA1801Zz ACTIVE SUBWOOFER SYSTEM USER S MANUAL TN 9 Power Sources This Mackie product should be connected to a power supply only of the type described in these operation instruc tions or as marked on this Mackie product CAUTION AVIS RISK OF ELECTRIC SHOCK DO NOT OPEN RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK 10 Power Cord Protection Power supply cords should be routed so that they are not likely to be walked upon or pinched by items placed upon or against them paying particular attention to cords at plugs convenience receptacles and the point where they exit this Mackie product 11 Object and Liquid Entry Care should be taken so that objects do not fall on and liquids are not spilled into this Mackie product DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL ATTENTION POUR EVITER LES RISQUES DE CHOC ELECTRIQUE NE PAS ENLEVER LE COUVERCLE AUCUN ENTRETIEN DE PIECES INTERIEURES PAR L USAGER CONFIER L ENTRETIEN AU PERSONNEL QUALIFIE AVIS POUR EVITER LES RISQUES D INCENDIE OU D ELECTROCUTION NIE LEGGED PAS CET ARTICLE 12 Damage Requiring Service This Mackie product should be A LA PLUIE OU A L HUMIDITE The lightning flash with arrow
4. and leaving the input ground connection disconnected There are also four male XLR connectors labeled THRU FULL RANGE OUTPUT and HIGH PASS MID HIGH FREQ OUTPUT These are also wired according to the AES standard Unbalanced Male XLR Connector The THRU output connectors allow you to connect more than one SWA1801z to your system Simply plug the signal source i e mixer output into the first speaker s FULL RANGE INPUT jacks and patch that speaker s THRU jacks to the next speaker s INPUT jacks and so on daisy chaining mul tiple speakers The THRU jack is wired straight from the FULL RANGE INPUT connector there is no electronic circuitry between so the signal coming out of the THRU jack is exactly the same as the signal going in The HIGH PASS OUTPUT jacks provide a line level signal of the frequencies above 120Hz that you connect to a pair of active speakers or to a stereo amplifier powering a pair of passive speakers PLACEMENT The SWA1801z subwoofer is designed to sit on the floor A socket is provided on the top of the SWA1801z for mounting the Mackie SA1521z or SRM450 active speakers Use the optional Mackie speaker mounting pole SPM100 to mount them on the SWA1801z see Hookup Diagram on page 5 As with any powered components protect the SWA1801z from exposure to moisture If you are setting them up outdoors make sure they are under cover if you expect rain at be
5. vice Request Number in BIG PRINT on top of the box The address of your closest authorized service center will be given to you by Technical Support or it may be obtained from our website Once it s repaired the autho rized service center will ship it back by ground shipping pre paid if it qualified as a warranty repair Note Under the terms of the warranty you must ship or drop off the unit to an authorized service center The re turn ground shipment is covered for those units deemed by us to be under warranty Note You must have a sales receipt from an authorized Mackie dealer for your unit to be considered for warranty repair IMPORTANT Make sure that the Service Request Number is plainly written on the shipping carton No receipt no war ranty service E LOUD Technologies reserves the right to inspect any products that may be the subject of any warranty claims before repair or replacement is carried out LOUD Technologies may at our option require proof of the original date of purchase in the form of a dated copy of the original dealer s invoice or sales receipt Final determination of warranty coverage lies solely with LOUD Technologies F Any products returned to one of the LOUD Technologies factory authorized service centers and deemed eligible for repair or replacement under the terms of this warranty will be repaired or replaced LOUD Technologies and its authorized service centers may use refurbished parts fo
6. a z LL gt WARNING The cabinet has no rigging points and is not suitable for rigging NEVER attempt to sus pend the SWA1801z by its handles VERY IMPORTANT AC POWER Be sure the SWA1801z is plugged into an outlet that is able to supply the correct voltage specified for your model If the volt age should drop below 97 of the specified line voltage the built in amplifiers will no longer be able to supply rated power They will continue to operate down to 80 of the rated line voltage but won t reach full power resulting in lower headroom Be sure the electrical service can supply enough amperage for all the components connected to it We recommend that a stiff robust supply of AC power be used because the amplifiers place high current demands on the AC line The more power that is avail able on the line the louder the speakers will play and the more peak output power will be available for cleaner punchier bass A suspected problem of poor bass per formance is often caused by a weak AC supply to the amplifiers Never remove the ground pin on the power cord of the SWA1801z or any other component This is very dangerous be Qan 2 Fl gt THERMAL CONSIDERATIONS The SWA1801z has a powerful 800 watt amplifier built in As amplifiers produce heat it is important to dissipate the heat as quickly as possible This results in increased reliability and longevity for the a
7. ground should be as short as possible Repair For warranty repair or replacement refer to the warranty information on page 11 Non warranty repair for Mackie prod ucts is available at a factory authorized service center To locate your nearest ser vice center visit www mackie com click Support and select Locate a Service Center Service for Mackie products living outside the United States can be obtained through local dealers or distributors If you do not have access to our website you can call our Tech Support department at 1 800 898 3211 Monday Friday 7 am to 5 pm Pacific Time to explain the prob lem Tech Support will tell you where the nearest factory authorized service center is located in your area Need Help You can reach a technical support representative Monday through Friday from 7 AM to 5 PM PST at 1 800 898 3211 After hours visit www mackie com and click Support or email us at techmail mackie com SWA1801z SPECIFICATIONS System Specifications Enclosure Geometry Rectangular do ne g H Mounting Methods z 120 Hz Frequency Response 3 dB Toor mount only 45 Hz 120 Hz WARNING The cabinet has no rigging points Maximum SPL 1m 129 dB and is not suitable for rigging NEVER attempt Peak Output 1m 135 dB to suspend the SWA1801z by its handles Crossover Frequency 120 Hz 12 dB octave Input Type Balanced differential Input Impedance 50 kQ Disclaimer Input Protection Level protected l
8. means described in this operating manual All other servicing should be referred to the Mackie Service Department 14 To prevent electric shock do not use this polarized plug with an extension cord receptacle or other outlet unless the blades can be fully inserted to prevent blade exposure Pour pr venir les chocs lectriques ne pas utiliser cette fiche polarise avec un prolongateur un prise de courant ou une autre sortie de courant sauf si les lames peuvent tre ins r es fond sans laisser aucune parie d couvert 15 Grounding or Polarization Precautions should be taken so that the grounding or polarization means of this Mackie product is not defeated 16 Power Precaution Unplug this Mackie product during light ning storms or when unused for long periods of time Note that this Mackie product is not completely disconnected trom the AC mains service when the power switch is in the OFF position 17 This apparatus does not exceed the Class A Class B whichever is applicable limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Canadian Department of Communications ATTENTION Le pr sent appareil num rique n met pas de bruits radio lectriques d passant las limites applicables aux appareils num riques de class A de class B selon le cas prescrites dans le r glement sur le brouillage radio lectrique dict par les ministere des communications d
9. should not be used near water for example near a bathtub washbowl kitchen sink laundry tub in a wet basement near a swimming pool swamp or salivating St Bernard dog etc 6 Cleaning Clean only with a dry cloth 7 Ventilation This Mackie product should be situated so that its location or position does not interfere with its proper ventila tion For example the Component should not be situated on a bed sofa rug or similar surface that may block any ventilation openings or placed in a built in installation such as a bookcase or cabinet that may impede the flow of air through ventilation openings 8 Heat This Mackie product should be situated away from heat sources such as radiators or other devices which produce heat WARNING The heat sink may reach high temperatures during standard use To ensure proper operation allow a minimum of six inches of clearance from the heat sink surface and adequate ventilation serviced only by qualified service personnel when A The power supply cord or the plug has been damaged or B Objects have fallen or liquid has spilled into this Mackie product or C This Mackie product has been exposed to rain or D This Mackie product does not appear to operate normally or exhibits a marked change in performance or E This Mackie product has been dropped or its chassis damaged 13 Servicing The user should not attempt to service this Mackie product beyond those
10. watts of continuous power The amplifier module sits on a heatsink that eliminates the need for fans dramatically extending life expectancy and eliminating maintenance cycles A tremendous benefit of having the amplifier located within the subwoofer cabinet is that the SWA1801z functions as a system optimizing acoustic electronic and mechanical designs to achieve the highest level of performance and value The cabinet is constructed with 15 mm thick multi layered birch plywood Carrying handles are integrated into each side for easy loading and cast ers are attached to the rear for easy transport 2005 2008 LOUD Technologies Inc All Rights Reserved REAR PANEL DESCRIPTION O POWER Switch Use this switch to turn the SWA1801z on and off Make sure the signal source s level control is turned down before you turn it on OAc Receptacle This is where you connect the AC linecord to provide AC power to the SWA1801z s built in power amplifiers Plug the linecord into an AC socket properly configured for your particular model LIMIT Indicator The SWA1801z has a built in limiter that prevents the amplifier outputs from over driving the transducers The LIMIT indicator lights when the limiter is activated It s okay for the LIMIT indicator to blink occasionally but if it blinks frequently or lights continu ously turn down the level control until the LIMIT indicator only blinks occasionally O SIGNAL Present Indi
11. 7 AM to 5 PM Monday through Friday Pacific Time to get au thorization for repair or replacement Alternately go to the Mackie website click Support www mackie com sup port and follow the instructions for reporting a warranty issue and submitting a request for an advance replacement 2 Advance Replacement Mackie will ship a replacement unit to you along with an invoice for the suggested retail price of the replacement unit You must return the defec tive unit immediately to cancel the invoice If you do not return the defective unit within 30 days you must pay the full amount stated in the invoice to satisfy your debt 3 Repair When you call Mackie Technical Support ex plain the problem and obtain a Service Request Number Have your Mackie product s serial number ready You must have a Service Request Number before you can obtain factory authorized service e Pack the product in its original shipping carton Also include a note explaining exactly how to duplicate the problem a copy of the sales receipt with price and date showing your daytime phone number and return street address no P O boxes or route numbers please and the Service Request Number If we cannot duplicate the problem or establish the starting date of your Limited Warranty we may at our option charge for service time and parts e Ship the product in its original shipping carton freight prepaid to the authorized service center Write the Ser
12. OGIES INC AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS AND IMPLIED INCLUDING THE WARRANTIES OF MERCHANT ABILITY AND FITNESS FOR A PARTICULAR PURPOSE THE WARRANTY GIVEN ON THIS PAGE SHALL BE STRICTLY LIMITED IN DURATION TO THREE YEARS FROM THE DATE OF ORIGINAL PURCHASE FROM AN AUTHORIZED MACKIE DEALER UPON EXPIRATION OF THE APPLICABLE WARRAN TY PERIOD LOUD TECHNOLOGIES INC SHALL HAVE NO FURTHER WARRANTY OBLIGATION OF ANY KIND LOUD TECHNOLOGIES INC SHALL NOT BE LIABLE FOR ANY INCIDENTAL SPECIAL OR CONSEQUENTIAL DAMAGES THAT MAY RESULT FROM ANY DEFECT IN THE MACKIE PRODUCT OR ANY WARRANTY CLAIM Some states do not allow exclusion or limitation of incidental special or conse quential damages or a limitation on how long warranties last so some of the above limitations and exclusions may not apply to you This warranty provides specific legal rights and you may have other rights which vary from state to state 11 16220 Wood Red Road NE Woodinville WA 98072 USA United States and Canada 800 898 32Il Europe Asia Central and South America 425 487 4333 Middle East and Africa 31 20 654 4000 Fax 425 487 4337 www mackie com E mail sales mackie com
13. R type connectors that produce the frequencies above 120Hz Connect these to a pair of full range active speakers or to an amplifer passive speaker combination The SWA1801z reproduces the frequencies below 120Hz SUBWOOFER LEVEL Control This adjusts the subwoofer level The center detent position provides 15 dB of headroom with a nominal 4 dBu input signal Use this as a starting point for setting the balance between the subwoofer and the main speakers O PHASE This switch reverses the polarity of the subwoofer output Depending on the place ment of the SWA1801z subwoofer relative to the full range speakers you may get a better low frequency response in the room if you reverse the polarity of the subwoofer s signal Experiment with this switch to de termine which position sounds best SIGNAL THERMAL POWER HIGH PASS MID HIGEI REO CAEN SUBWOOFER FULL RANGE CONTROL THRU FULL RANGE OUTPUT L Ug a i HOOKUP DIAGRAMS SA1521z SA1521z C300z C300z Plays the Mid and Plays the Mid and Plays the Mid and Plays the Mid and i High Frequencies High aet High Frequencies High Frequencies a m T Stereo Power Line Level Line Level Amplifier Mid High Mid High i Line Level o ii Hi Pass Out I Out Left i Out Right
14. Since we aie aes siris omie i Thermal Protection Input stage muting Nes products better by incorporating new and improved materials components and manufacturing methods we reserve the right to change these specifications at any time without notice Transducer Specifications Low Frequency Transducer Mackie and the Running Man figure are Diameter 18 457 mm registered trademarks of LOUD Technologies Inc Voice Coil Diameter 4 0 102 mm All other brand names mentioned are trade Power Amplifier marks or registered trademarks of their respective hol h ledged Low Frequency Power Amplifier olders and are hereby acknowledged D Technologies Inc Rated Power 800 Watts continuous 2005 2008 LOUD Technologies Inc All Rights R d 1000 Watts peak PONT Rated THD lt 0 03 Cooling Passive Dimensions Line Input Power a 23 5 597 mm a 23 5 597 mm US 120 V 60 Hz am ao 69 mm Europe 230 V 50 Hz 284 mm Rated power into loudspeaker s rated impedance Physical Properties 89 mm Height 28 5 724 mm Width 23 5 597 mm Depth 23 5 597 mm Weight 132 Ibs 60 kg Enclosure 15 mm thick multi layered baltic birch wood N a 27 9 709 mm a 23 5 597 mm gt TOP SWA1801z On Axis Frequency Response with second and third harmonic components 110 Third SPL 100 dB 100 Hz S
15. ank you for choosing Mackie s active sound reinforcement speaker systems The SWA1801z is a high output active sub woofer system It features a high precision 18 transducer combined with application specific amplifier technology The system is composed of a single compact subwoofer cabinet with built in control and amplifier electronics Connecting and setting up the SWA1801z is a breeze It accepts a stereo or mono line level signal via female XLR input jacks Male XLR Thru jacks are provided for daisy chaining the signal to additional SWA1801z cabinets The built in crossover separates the low frequencies from the high frequencies and routes the high frequencies to the male XLR high pass output jacks Connect these to the inputs of full range active speakers such as the Mackie SA1521z or to an amplifier powering a pair of passive speakers such as a combination of the Mackie Part No SW0619 Rev B 01 08 Typical Example Duo in small club Subway Train Very loud classical music The SWA1801z can produce a maximum SPL of Loudest parts at a rock concert 135 dB 1m Patrice screaming at Ron about deadlines THERMAL CONSIDERATIONS SERVICE INFORMATION Me14001 and C300z A Phase switch gives you the option of reversing the polarity of the signal to the subwoofer by 180 A Subwoofer Level control allows you to adjust the balance between the sub woofer and the full range speakers The built in amplifier produces 800
16. away Troubleshooting No power e Our favorite question Is it plugged in Make sure the AC outlet is live check with a tester or lamp e Our next favorite question Is the POWER switch on If not try turning it on e Js the POWER LED on the rear panel slowing green If not make sure the AC outlet is live If so refer to No sound next e The internal AC line fuse may be blown This is not a user serviceable part If you suspect the AC line fuse is blown please see the Repair section on page 9 No sound e Is the input LEVEL control for the input source or the subwoofer turned all the way down Verify that all the volume controls in the system are properly ad justed e Is the signal source working and making union scale Make sure the connecting cables are in good repair and securely connected at both ends Make sure the output volume gain control on the mix ing console is turned up sufficiently to drive the inputs of the speaker e Make sure the mixer does not have a Mute on or a Processor loop engaged If you find something like this make sure the volume gain is turned down before disengaging the offending switch e Is the thermal protection circuit activated Make sure there is at least six inches of free space behind the SWA1801z Poor bass performance e Check the polarity of the connections between the mixer and the loudspeak ers You may have your positive and negative connections rever
17. cator This LED illuminates whenever there is a signal present at the FULL RANGE INPUT connector on the rear panel THERMAL Indicator The SWA1801z has a thermal protection circuit that monitors the internal tempera ture of the amplifiers and heatsink If the internal temperature should exceed a safe operating level this indicator lights and the signal is muted to allow the amplifier to cool When the temperature cools to a safe level once again the thermal protection circuit deactivates and normal operation resumes Note Activation of the thermal protection circuit is an indication that you should take steps to avoid continued thermal problems See Thermal Considerations on page 7 a ACTIVE SUBWOOFER POWER Indicator When the POWER switch is turned on and the linecord is connected to an active AC power supply this indicator lights green to let you know that you re ready to rock and roll The cool blue LED on the front of the cabinet works in the same way FULL RANGE INPUT These are female XLR type connectors that accept a balanced line level signal from a mixing console or other signal source THRU FULL RANGE OUTPUT These are male XLR type connectors that produce exactly the same signal that is connected to the FULL RANGE INPUT jack Use it to daisy chain several SWA1801z s together off the same signal source O HIGH PASS MID HIGH FREQ OUTPUT These are male XL
18. head symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons Le symbole clair avec point de fl che l int rieur d un triangle quilat ral est utilis pour alerter l utilisateur de la pr sence l int rieur du coffret de voltage dangereux non isol d ampleur suffisante pour constituer un risque d l ctrocution The exclamation point within an equilateral triangle is intended to alert the user of the presence of important operating and maintenance servicing instructions in the literature accompanying the appliance Le point d exclamation l int rieur d un triangle quilat ral est employ pour alerter les utilisateurs de la pr sence d instructions importantes pour le fonctionnement et l entretien service dans le livret d instruction accompagnant l appareil SAFETY INSTRUCTIONS 1 Read Instructions All the safety and operation instructions should be read before this Mackie product is operated 2 Retain Instructions The satety and operating instructions should be kept for future reference 3 Heed Warnings All warnings on this Mackie product and in these operating instructions should be followed 4 Follow Instructions All operating and other instructions should be followed 5 Water and Moisture This Mackie product
19. mplifier The amplifier module is mounted on a large heatsink which is cooled by con vection where cool air is drawn through it s fins carrying the heat away In order for this convection cooling to work efficiently it is important to provide adequate airspace behind the loudspeaker When you position the SWA1801z we recommend leaving at least six inches of air space behind it In the unlikely event of the amplifier overheating a built in thermal switch will activate which mutes the signal When the amplifier has cooled down to a safe oper ating temperature the thermal switch resets itself and the SWA1801z resumes normal operation If the thermal switch activates frequently try turning down the level control a notch or two on the mixing console or other signal source or on the subwoofer itself to avoid overheating the amplifiers If the temperature in the room is too high it could cause the amplifier to over heat In this case you should try aiming a fan at the rear panel to move more air across the heatsink panel SERVICE INFORMATION If you think your Mackie product has a problem please check out the follow ing troubleshooting tips and do your best to confirm the problem Visit the Support section of our website www mackie com support where you will find lots of useful information such as FAQs documentation and user forums You may find the answer to the problem without having to send your Mackie product
20. r repair or replace ment of any product Products returned to LOUD Technologies that do not meet the terms of this Warranty will not be repaired unless payment is received for labor materials return freight and insurance Products repaired under warranty will be returned freight prepaid by LOUD Technologies to any location within the boundaries of the USA or Canada G LOUD Technologies warrants all repairs performed for 90 days or for the remainder of the warranty period This warranty does not extend to damage resulting from improper installa tion misuse neglect or abuse or to exterior appearance This warranty is recognized only if the inspection seals and serial number on the unit have not been defaced or removed H LOUD Technologies assumes no responsibility for the timeli ness of repairs performed by an authorized service center I This warranty is extended to the original purchaser This Warranty may be transferred to anyone who may subsequently purchase this product within the applicable warranty period for a nominal fee A copy of the original sales receipt is required to obtain warranty repairs or replacement J This is your sole warranty LOUD Technologies does not authorize any third party including any dealer or sales representative to assume any liability on behalf of LOUD Tech nologies or to make any warranty for LOUD Technologies Inc K THE WARRANTY GIVEN ON THIS PAGE IS THE SOLE WARRANTY GIVEN BY LOUD TECHNOL
21. sed at one end of one cable causing one loudspeak er to be out of phase e Try switching the PHASE switch on the rear panel This affects the polarity between the full range speakers and the SWA1801z and may improve the low frequency response Poor sound e Js it loud and distorted Make sure that you re not overdriving a stage in the signal chain Verify that all level controls are set properly e Is the input connector plugged completely into the jack Be sure all con nections are secure It s a good idea to periodically clean all electrical connec tions with a non lubricating electrical contact cleaner Noise e Make sure all connections to the active loudspeakers are good and sound e Make sure none of the signal cables are routed near AC cables power trans formers or other EMI inducing devices e Is there a light dimmer or other SCR based device on the same AC circuit as the SWA1801z Use an AC line filter or plug the SWA1801z into a different AC circuit Hum e Try disconnecting the cable connected to the INPUT jack If the noise disap pears it could be a ground loop rather than a problem with the SWA1801z Try some of the following troubleshoot ing ideas e Use balanced connections throughout your system for the best noise rejection e Whenever possible plug all the audio equipment s linecords into outlets which share a common ground The distance between the outlets and the common
22. u Canada WARNING To reduce the risk of fire or electric shock do not expose this appliance to rain or moisture WARNING The cabinet has no rigging points and is not suitable for flying Never at tempt to suspend the cabinet by its handles Lend Me Your Ears Exposure to extremely According to OSHA any exposure in excess high noise levels may of these permissible limits could result in some cause permanent hear hearing loss To ensure against potentially dan ing loss Individuals vary serous exposure to high sound pressure levels considerably in suscepti it is recommended that all persons exposed to bility to noise induced hearing loss but nearly equipment capable of producing these levels use everyone will lose some hearing if exposed to hearing protectors while this unit is in opera sufficiently intense noise for a period of time tion Ear plugs or protectors in the ear canals or The U S Government s Occupational Safety and over the ears must be worn when operating this Health Administration OSHA has specified amplification system in order to prevent a per the permissible noise level exposures shown in manent hearing loss if exposure is in excess of this chart the limits set forth here Duration Per Day Sound Level dBA In Hours Slow Response 0 5 0 25 or less CONTENTS Lend Me Your Ears INTRODUCTION REAR PANEL DESCRIPTION HOOKUP DIAGRAMS CONNECTIONS PLACEMENT AC POWER INTRODUCTION Th
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