JBL GTO1020 Owner's Manual

Also see for GTO1020: Technical data

JBL GTO1020 Owner's Manual Manual pdf 2 page image

Thank you for purchasing anew JBL GTO Series subwoofer.Subwoofer installation requireswoodworking skills and someexperience disassembling andreassembling automotive interiors.If you lack the tools or necessaryskills, have your subwoofer installedby an authorized JBL dealer.Warning: Playing loud music inan automobile can permanentlydamage your hearing as well ashinder your ability to hear traffic.We recommend listening at lowlevels while driving. JBL accepts noliability for hearing loss, bodily injuryor property damage resulting fromuse or misuse of this product.GTO Series subwoofers areoptimized to perform best in small,sealed, vented and prefabricatedbandpass enclosures. Whileinfinite-baffle mounting ofGTO Series subs is possible,power handling will be greatlycompromised because there’sno enclosed volume of air toprevent the speaker’s cone frommoving past its limit. For thisreason, we do not recommendinfinite-baffle mounting forGTO Series subwoofers.You should choose the enclosureyou will use based on the type ofmusic you listen to, how muchamplifier power you will use for thesubwoofer and how much spaceinside the vehicle you can devoteto a subwoofer enclosure.Because a sealed enclosureprovides the most control over thewoofer’s movement, a woofermounted in a sealed enclosure willhandle more power than a woofermounted in another enclosure type.Sealed enclosures provide moreaccurate sonic reproduction thanother enclosure types, so they arewell suited to all types of music.Sealed-enclosure constructionis straightforward and there aremany prefabricated sealedenclosures available. An optimumsealed enclosure is always smallerthan other types of enclosuresoptimized for a particular speaker,so they require the smallest amountof space inside the vehicle.Vented enclosures provide betterefficiency in the 40Hz – 50Hz rangebut this efficiency comes at theexpense of sound in the lowestoctave (below 40Hz) and at theexpense of some control and powerhandling. If you are using a smallamplifier, a vented box will providemore bass output from less power.Vented enclosures are also wellsuited to a variety of music types.Because vented enclosures requirethe volume of the enclosure andthe size of the port to have aspecific relationship with thecharacteristics of the woofer, theenclosure must be built exactly tothe specifications provided. Whilethere are some prefabricatedvented boxes available, matching aprefabricated box to a particularwoofer is difficult. If you wish to usea vented enclosure, we stronglyrecommend having your authorizedJBL dealer build it or verify thatyour design is correct if you wishto build it yourself. An optimumvented enclosure is always largerthan the optimum sealed box forthe same woofer and will requiremore space inside the vehicle.Bandpass enclosures oftenprovide the most output availablefrom any amplifier and subwoofercombination at the expense ofsonic accuracy. If sheer SPL(sound-pressure level) is what youdesire most, choose a bandpassenclosure. Bandpass-enclosuredesign is very tricky and the aidof a computer and enclosuredesign software is necessary. Ifyou are an experienced installeror have some woodworkingexperience, you may wish to buildthe enclosure described in theenclosure design sheet includedwith this woofer. Fortunately, thereare many prefabricated bandpassboxes available and they are alloptimized to extract the mostoutput possible from any woofer.Bandpass enclosures can be quitelarge and may require a lot of spaceinside your vehicle.02Choosing an Enclosure JBL GTO Series

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