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AD-S28Tw

1. 9 9 AD S28Tw Voke Dimensions 18 mm 0 7 400 mm 15 75 cc j 4 28 mn 1 1 gt lt _ 13 mm 0 5 mm 8 0 E 4 S AS 4 64 mm 2 5 gt 127mm 5 0 e 405 mm 159 ________5 How to Contact QSC Audio Products LLC Como comunicarse con QSC Audio Products LLC Comment prendre contact avec OSC Audio Products LLC Kontaktinformationen fiir OSC Audio Prodcuts LLC BR OSC Audio Products LLC Mailing Address OSC Audio Products LLC 1675 MacArthur Boulevard Costa Mesa CA 92626 1468 USA Telephone Numbers A Main Number 714 754 6175 AV Sales amp Marketing 714 957 7100 or toll free USA Only 800 854 4079 Customer Service 714 957 7100 or toll free USA Only 800 772 2834 Facsimile Numbers Sales amp Marketing FAX 714 754 6174 Customer Service FAX 714 754 6173 World Wide Web www qscaudio com E mail info qscaudio com service qscaudio com aoc OSC Audio Products LLC 1675 MacArthur Boulevard Costa Mesa California 92626 USA 2009 OSC and the OSC logo are registered with the U S patent and Trademark Office
2. wide orientation 2 Port facing laterally subwoofer in narrow orientation 3 Port facing down For each of these orientations the points for eyebolt and shear plate attachment are very specific Please consult the follow ing illustrations to understand each orientation and pay careful attention to which attachment points are correct fi TIN lezi kal The locations of the evebolts were designed to suspend the subwoofer using the fewest number of attachment points Where possible there are only three attachment points to be used These points are located so that the triangle they form encloses the center of gravity and the subwoofer will balance with all three points suspended In some cases one or more of the attachment points is not on a cabinet side that is facing up In these cases DO NOT USE AN EVEBOLT In this position the evebolt will be in shear and the eyebolt is greatly derated in this use For these attachment points a SHEAR PLATE MUST BE USED FOR SUSPENDING the subwoofer Remove the screws from the selected attachment points using a 2 phillips head screw driver or electric driver Remove only the screws that will be used for the attachment evebolts or shear plates DO NOT REMOVE ANY OTHER SCREWS If a screw hole is left open it will create an airleak which will cause noise and compromise the performance of the cabinet Evebolts Screw the evebolt into the attachment poin
3. black paint paintable Zinc plated steel with black paint coating and black ABS end caps Included black powder coated steel yoke with attachment hardware Included black zinc coated forged shoulder steel M6 eyebolts Included black powder coated steel shear plates with attachment hardware Included black rubber feet with integral threaded bolt 43 Ib 19 5 kg 55 Ib 25 kg 1 All frequency ranges specified refer to half space measured response 2I1 2 Calculated peak SPL at 1m half space speaker operating at rms power pink noise input 50 Hz to 20 kHz 3 Maximum input power tested in accordance with IEC recommendations 50 Hz to 20 kHz band limiting 6 dB signal crest factor Specifications are subject to change without notice For detailed information visit QSC s web site at http www qscaudio com or call us at 1 800 854 4079 toll free USA only 9 AD S28Tw Dimensions 50 mm 1 9 a 574 mm 22 6 394 mm 15 5 NA I E 10 mm 0 4 gt 125 mm lt 4 9 L 251 mm p 9 9 404 mm 15 9 109 mm 4 3 SS c f TE GE gt 114 mm lt 4 5 254 mm 10 0 288 mm fi 11 3 E 574 b 226 E mar 404 mm 15 9 ee gt 125 mm 4 9 e 251mm
4. recommended that a 6 dB 30 Hz high pass filter be engaged to prevent saturation of the transformer Specifications Frequency Response Maximum Output Calculated Transducers Impedance ohm Power Handling RMS IEC 2hrs Recommended amp rating Sensitivity Internal Filter Optional Processing Transformer Type Taps Connectors Controls Enclosure Configuration Enclosure Construction Environmental Finish Grille Mounting Hardware Weight Net Shipping Specification Notes AD S28Tw 42 165 Hz 3 dB 36 205 Hz 10 dB 118 dB SPL continuous rms output 124 dB SPL peak output Dual 8 inch 200 mm weather resistant polypropylene cone woofer rubber surround 8 0 nom 9 5 min at 77 Hz with LPF IN 5 3 min at 63 Hz with LPF OUT 250 W 500 W 94 dB 2 83 V 1 m ground plane 211 120 Hz low pass passive bypassable 120 Hz low pass gt 12 dB octave internal filter bypassed Custom low distortion laminated core wide bandwidth design 70 V 200 100 50 25 W 100 V 200 100 50 W 8 Q selected by rotary switch Four position screw terminals 2 in 2 out Transformer tap selector and bypass rotary switch Low pass filter rotary switch Dual chamber bandpass one chamber ported surface mount Marine grade plywood IEC 60529 IP x4 rated against dust and water incursion Not recommended for outdoor installation without adequate cover Textured
5. aoc tes AcousticDesign Surface mount Loudspeaker User Manual AD S28Tw Dual 200 mm 8 in Bandpass Subwoofer IN AL MIMI REES TD 000287 00 B IMPORTANT SAFETY PRECAUTIONS 1 Read these instructions 2 Keep these instructions 3 Heed all warnings 4 Follow all instructions 5 Clean only with a dry cloth 6 Install in accordance with all OSC instructions and documentation Suspension and mounting should be attempted only by those who are trained and skilled in safe suspension and mounting practices 7 Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat 8 Only use attachments accessories from OSC Audio Products LLC 9 Use only with mounts or brackets specified by OSC Audio Products LLC 10 Refer all servicing to qualified personnel Servicing is required when the apparatus has been damaged in any way of uninsulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of shock to humans The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating The lightning flash with the arrowhead symbol within an equilateral triangle is intended to alert the user to the presence A and maintenance servicing instructions in this manual WARNING Before placing installing rigging
6. bwoofer will not affect performance Once positioned tighten the bolts so that the subwoofer will not rotate with force A The yoke must be secured to structure that is capable of supporting the weight of the subwoofer and must be connected using load rated hardware Consult a licensed professional engineer when any doubt or questions arise regarding a physical equipment installation Once the subwoofer is secured in position the OSC logo can be rotated if desired If the logo is difficult to rotate the first time a tool may be required A small flat head screw driver is recommended Gently work the tool between the logo badge and the grille to allow rotation Exercise care to avoid scratching the grille surface Anv unused attachment point can be used as a safetv seismic secondarv attachment Attach an evebolt to an available at tachment point according to the section of the manual titled Suspending the Subwoofer Using Evebolts and Shear Plates Be sure to leave less than 12 in 300 mm of slack in the secondarv attachment cable A The safety seismic secondary attachment must be secured to structure that is capable of supporting the weight of the subwoofer and must be connected using load rated hardware Suspending the Subwoofer Using Eyebolts and Shear Plates The subwoofer can be suspended using the included eyebolts There are three possible orientations for installing the sub woofer this way 1 Port facing laterally subwoofer in
7. ention to which attachment points are correct Remove the screws from the selected attachment points using a 42 phillips head screw driver or electric driver Remove only the four screws for the attachment of the feet DO NOT REMOVE ANY OTHER SCREWS If a screw hole is left open it will create an airleak which will cause noise and compromise the performance of the cabinet Screw the rubber feet into the attachment point It should not require significant force to rotate the foot if the threads are properly engaged If the foot is not screwing in easily remove it and engage it in the threads again A Do not use any tools for installation of the feet The rubber may be damaged if a tool is used Continue rotating the foot until it makes contact with the cabinet Only hand generated force is necessary to properly seal the hole and keep the foot screwed in Once the feet are attached place the subwoofer in the desired location 4 Mounting the Subwoofer Using the Voke The voke can be used to mount the subwoofer either on a vertical surface like a wall or from an overhead surface like a ceiling or ceiling beams In either case the attachment points on the enclosure for securing the voke are the same The yoke is designed to attach to only two sides of the cabinet and cannot be attached to any other surfaces The yoke features slots to allow for either maximum rotation of the cabinet or for minimum separation between the cabinet and the mo
8. icate in our judgement a manufacturing defect This warranty does not extend to any product which has been subjected to misuse neglect accident improper installation or where the date code has been removed or defaced OSC shall not be liable for incidental and or consequential damages This warranty give you specific legal rights This limited warranty is freely transferable during the term of the warranty period Customer may have additional rights which vary from state to state In the event that this product was manufactured for export and sale outside of the United States or its territories then this limited warranty shall not apply Removal of the serial number on this product or purchase of this product from an unauthorized dealer will void this limited warranty Periodically this warranty is updated To obtain the most recent version of QSC s warranty statement please visit www qscaudio com Contact us at 800 854 4079 or visit our website at www qscaudio com Copyright 2008 OSC Audio Products LLC OSC is a registered trademark of OSC Audio Products LLC QSC and the OSC logo are registered with the U S Patent and Trademark Office All trademarks are the property of their respective owners 2 12 Introduction Congratulations and thank you for your purchase of this subwoofer The AD S28Tw model offers excellent acoustic perfor mance in an easy to install and attractive enclosure Please review these ins
9. o hold the shear plate in place but leave it just loose enough to rotate with minimum force Check the alignment of the shear plate so that it is perpendicular to the cabinet Once positioned tighten the bolts so that the shear will not rotate with force The shear plates must be secured to structure that is capable of supporting the weight of the subwoofer and must be connected using load rated hardware Consult a licensed professional engineer when any doubt or questions arise regarding a physical equipment installation Hex head phillips head M6 Bolt Lock washer Flat washer Shear plate Attached rubber pad Once the subwoofer is secured in position the OSC logo can be rotated if desired If the logo is difficult to rotate the first time a tool may be required A small flat head screw driver is recommended Gently work the tool between the logo badge and the grille to allow rotation Exercise care to avoid scratching the grille surface Any unused attachment point can be used as a safety seismic secondary attachment Attach an eyebolt to an available attachment point according to the Eyebolt instructions above Be sure to leave less than 12 in 300 mm of slack in the secondary attachment cable A The safety seismic secondary attachment must be secured to structure that is capable of supporting the weight of the subwoofer and must be connected using load rated hardware Wiring Signal to the Subwoofer The input terminal i
10. or suspending any loudspeaker product inspect all hardware suspension cabinets transducers brackets and associated equipment for damage Any missing corroded deformed or non load rated component could significantly reduce the strength of the installation and should be immediately corrected Use only hardware which is rated for the loading conditions of the installation and any possible short term unexpected overloading Never exceed the rating of the hardware or equip ment Consult a licensed professional engineer when any doubt or questions arise regarding a physical equipment installation Warra nty USA only other countries see your dealer or distributor Disclaimer OSC Audio Products LLC is not liable for any damage to amplifiers or any other equipment that is caused by negligence or improper installation and or use of this loudspeaker product QSC Audio Products 3 Year Limited Warranty OSC Audio Products LLC QSC guarantees its products to be free from defective material and or workmanship for a period of three 3 years from the date of sale and will replace defective parts and repair malfunctioning products under this warranty when the defect occurs under normal installation and use provided the unit is returned to our factory or one of our authorized service stations via prepaid transportation with a copy of proof of purchase i e sales receipt This warranty provides that the examination of the returned product must ind
11. s on the rear of the subwoofer and is covered by a hinged door Open the door to expose the screw terminals There are four sets of screw terminals arranged in positive negative pairs for parallel wiring One pair is labeled for input receive signal and the other pair is labeled for output pass signal to next device But be sure that the wiring is consistent and paired properly The terminals are designed to accept wiring between 18 AWG 1 02 mm and 12 AWG 2 053 Use a 2 Phillips head screw driver to loosen the terminal screw Strip the insulation for the signal wire so that approximately 3 4 in 20 mm of bare wire is exposed Place the bare wire under the screw down plate and retighten the screw as tightly as possible with a manual screw driver The input and output pairs are parallel The output terminals will pass exactly what is presented at the input terminals If low impedance full range audio signal is presented at the input it is recommended that the subwoofer s internal low pass filter be used in this instance then low impedance full range audio will be passed to the next device wired to the parallel output of the AD S28Tw If high impedance 70V or 100V signal is presented at the input then high impedance 70V or 100V signal will be passed to the next device wired to the parallel output of the AD S28Tw If an external low pass filter is used and only low passed signal is presented at the input then only low passed audio will go to the nex
12. t It should not require significant force to rotate the evebolt if the threads are properly engaged If the evebolt is not screwing in easily remove it and engage it in the threads again Continue rotating the eyebolt until it makes contact with the cabinet Once the eyebolt shoulder has made contact with the cabinet continue to rotate it until it reaches the desired alignment with the cabinet If necessary use a tool such as a long handheld screwdriver to tighten it Place the blade of the screwdriver through the eyebolt and use it to rotate the eyebolt It is not necessary to tighten the eyebolt to the point that it cannot rotate any further Once the shoulder has made contact with the enclosure any further tightening is actually cutting the shoulder of the eyebolt in to the wood of the cabinet This cutting in coupled with the tension of suspension on the eyebolt will prevent the eyebolt from loosening once the cabinet is suspended A The eyebolts must be secured to structure that is capable of supporting the weight of the subwoofer and must be connected using load rated hardware Consult a licensed professional engineer when any doubt or questions arise regarding a physical equipment installation Shear Plates Align the mounting hole of the shear plate with the enclosure attachment point with the rubber pad between the plate and the cabinet Place the attachment hardware according to the illustration Tighten the hex head bolts enough t
13. t device wired to the parallel output of the device Using 70V or 100V Drive for Distributed Audio Systems High impedance 70V or 100V drive allows for a typically larger number of loudspeakers to be wired to one amplifier output and allows smaller wire gauge to be used over longer runs with less loss When using high impedance drive the internal transformer on the AD S28Tw MUST be engaged To do this rotate the tap selector switch so that it is aligned with one of the four three for 100V transformer tap settings The tap setting on the switch selects which tap of the transformer is used to buffer the signal and is expressed in terms of the power draw on the amplifier The larger the tap the more output from the subwoofer Transformer tap settings should be considered when selecting an amplifier to drive the system A good rule of thumb is that the rated power of the amplifier per channel should be the minimum of all of the connected taps added together with an additional 20 for headroom An example 8 Loudspeakers each tapped at 50W 50 50 50 50 50 50 50 50 400 or 8 x 50 400 400 20 480 Use an amplifier with a minimum channel power rating of 480W Multitap 70V 100V transformers can saturate with low frequency energy Saturation causes analog clipping distortion of the signal The transformer use in the AD S281w is custom designed to saturate at frequencies below the functional low frequency range of the AD S281w It is
14. t with grille extra grille backing foam sheet steel yoke bracket steel suspension point shear plates x3 steel M6 forged shoulder eyebolts x4 hex head phillips head M6 bolts x3 flat washers x4 rubber yoke mounting gaskets x2 rubber feet with integrated attachment bolts x4 Installation Options The AD S28Tw has been designed for installation flexibilitv The subwoofer may be mounted using a number of different suspension techniques as well as being easily shelf or floor mounted The OSC logo on the grille is rotatable to accommo date horizontal or vertical orientation While low frequency products do not have directional dispersion characteristics all of the sonic energy produced by this subwoofer exits the cabinet through the port due to the ported bandpass design For that reason the port located behind the grille MUST NOT be phvsicallv blocked bv anvthing and should not be placed within twelve 12 inches of anv objects larger than 3 to 4 inches 75 to 100 mm When the subwoofer is floor or shelf standing it is recommended that the rubber feet be attached For suspended installations the enclosure can be attached with flypoints or the included voke bracket The enclosure can be oriented in multiple positions when suspended Attaching the Feet Locate the four M6 attachment points on the bottom of the sub Consult the following illustrations and pav careful att
15. tructions and carefully follow the recommenda tions Consult a licensed installation professional if you are uncertain about any mounting issues The AD S28Tw features dual 8 200 mm low frequency LF drivers in a ported bandpass enclosure The AD S28Tw is equipped with an audio transformer suitable for 70V and 100V distributed systems as well as a tap selector switch which can bypass the transformer for 8 ohm applications The AD S28Tw also includes a bypassable 120Hz low pass filter The marine grade plywood enclosure may be used in floor standing as well as yoke mounted and suspended applications What s Included Vour surface mount subwoofer includes Features 1 Marine grade plvwood enclosure painted 2 ABS grille endcaps 3 Steel grille with foam backing 4 Rotatable OSC logo badge 5 Integrated M6 suspension points 6 Input cup with rotating door see detail 7 Rubber feet shown attached 8 Service access panel 9 Low Pass Filter Switch 10 Transformer tap switch 11 Input cup door shown in open position 12 Input screw terminals AD S28TW 120 Hz X Over GOGOL TRANSFORMER TAPS CE S i E ASC AUDIO PRODUCTS LLC COSTA MESA CALIFORNIA MADE IN CHINA the loudspeaker cabine
16. unting surface Consult the following illustrations It is recommended that the yoke be attached to the mounting surface prior to attaching the yoke to the subwoofer enclo sure The yoke is designed to allow attachment to the mounting surface with mounting points ranging from 5 5 in 140 mm to 6 5 in 165 mm apart 1 Remove the screws from the selected attachment points using a 2 phillips head screw driver or electric driver Remove only the two screws that will be used for the attachment of the yoke DO NOT REMOVE ANY OTHER SCREWS If a screw hole is left open it will create an airleak which will cause noise and compromise the performance of the cabinet 2 Remove the adhesive backing from the rubber pad and attach the pad to the cabinet by pressing the adhesive coated side against the cabinet Make sure not to obstruct the attachment holes The adhesive will hold the pad in place as you mount the enclosure to the yoke 3 Align the yoke with the attachment points on the subwoofer and place the attachment hardware according to the il lustration Flat washer Adhesive rubber pad affixed to enclosure 4 Tighten the hex head phillips head bolts enough to hold the subwoofer in place but loose enough to rotate with minimum force Check the alignment of the subwoofer for best desired appearance As long as the port is not blocked the alignment of the su

AD-S28Tw

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