SOUND REINFORCEMENT LOUDSPEAKER SYSTEMS

1 SOUND REINFORCEMENTLOUDSPEAKER SYSTEMSFREEDOM OF CHOICET here s a little something for everyonein SR Series II. From small combo vocalreinforcement to large club SYSTEMS , frommobile DJ and recorded music repro-duction to stage monitoring, front fills andmain PA stacks in concert applications. SRSeries II has evolved into being the firstchoice of musicians and SOUND engineersworldwide. Here s what this evolution MODELSYou have 13 total configurations fromwhich to choose including two extremelyversatile floor monitors, five 2-way andthree 3-way full range stage speakers, andthree powerful subwoofers.

2 SR Series IIgives you more SYSTEMS containinglarge format compression drivers andmore component combinations. In short,more LOUDSPEAKER SYSTEMS to fit a widerange of professional SOUND newest variation ofhorn technology delivers vertical coverage with thewe ve ever achieved in Directivity90 horizontal by 50 lowest throat distortionformat high frequencyOur newest horn technology, incor-porated in five SR Series II models, delivers90 horizontal by 50 vertical Aperture technology is the resultof designing the compression driver andhorn together thus providing optimumperformance.

3 The large format com-pression driver has a 38 mm (1 1/2 in)exit, eliminating the 50 mm (2 in)transition tube, and allowing the phaseplug to couple directly to the waveguide forgreatly reduced midband distortion. Theresult is pure and precise mid and highfrequency reproduction even at the highestsound pressure FORMATCOMPRESSION DRIVEROPTIMIZED APERTURE HORN/DRIVERD esigned exclusively to match the newhorn, the 2447J compression driver incor-porates the absolute latest in compressiondriver technology.

4 Its design virtuallyeliminates the need for a tweeter bysmoothly extending high frequencyresponse to well above 18 kHz. The resultis outstanding midrange performance withsparkling highs and crisp, clean TRANSDUCERTECHNOLOGYThe 2119H transducer was developedfor extra output power capability indedicated midrange applications. It isincorporated in the SR4735A. Our new2417H small format compression driverincorporates the lightest diaphragm wehave ever made, resulting in exceptionaltransient response and enhanced highfrequency clarity.

5 In fact, the 2417 Hdelivers 5 dB greater level at 15 kHz thanits predecessor. It is used as a highfrequency element in the SR4735A andSR4738A 3-way SYSTEMS and the SR4722A2-way 2447J employs our CoherentWave phase plug to maintain absolutephase coherency and increase highfrequency output. To reduce distortion,improve reliability and extend high freq-uency performance, the large diameterdiaphragm incorporates a radial rib design and JBL s patented three-dimensional diamond pattern surround.

6 A100 mm (4 in) diameter edgewoundaluminum voice coil drives the large formatdiaphragm and a powerful 9 kg (20 lb)magnet structure delivers extremely highefficiency and superb transient response,thus producing superior acoustic outputwithout sacrificing clarity and improved high frequencyperformance and lower distortion, manyapplications previously requiring a 3-waysystem can now be handled well with alower cost 2-way CROSSOVERNETWORKSThe terminal cup is made of heavygauge steel to endure years of road use andabuse.

7 You can now choose between theease and simplicity of l/4-inch phonejack(s) or the assurance of maximumcurrent transfer and the ability to use asingle connector for full range or biampapplications with the Neutrik Speakon connectors. For your convenience, bothare included on the SR Series II except forthe SR4732A-T which is intended fortri-amp use only and is equipped with dual8-pole Speakon high-current, low-profile rotaryswitch selects between Passive (full range)and Biamp settings making changes inoperational modes quick, easy Series II crossover networks aremanufactured with the highest qualityclose-tolerance capacitors, high-powerresisters and low-loss inductors to assurethe smoothest possible acoustic response.

8 (See Network Facts, left)VGC low frequency transducers control beat bycreating an airflow around the voice coil providinggreater reliability, very low distortion and reducedpower TESTEDVGC tRANSDUCERS Finally, our VGC (Vented GapCooling) low frequency transducers,proven workhorses, are the foundation ofmost concert SOUND SYSTEMS the top tour SOUND engineers, you canexpect the same unparalleled powerhandling, low distortion, extremely widedynamic range and low power com-pression. From a user s standpoint, thismeans more acoustic output for everyamplifier watt of input, superior reliabilityand sonic quality FACTSIn most models, network PCB's are anchored to the bottom ofthe cabinet, allowing beat to dissipate upward.

9 This andother design features provide additional structural integrityand improved reliability. SR Series II networks are engi-neered to survive many years of road work and heavy dutyreducing heat generation and allowing more power to reachthe transducers. Polystyrene bypass capacitors are utilized inAs transducer power ratings increase, so do the requirementsfor long term power handling in the crossover networks. Infull range SYSTEMS , the passive crossover must also be engi-neered to handle the higher current levels while maintainingphase integrity and providing the smoothest possiblecomponent-to-component resistors utilize a new 4-point mounting topology formechanical stability.

10 Chokes feature very low insertion loss,critical circuit locations to improve the high frequencytransient CONSTRUCTIONSYSTEM FACTSSR Series II enclosures are fabricatedof high grade, void-free plywood for maxi-mum structural integrity. All joinery is fit toexacting tolerances and bonded with high-temperature adhesives. During assembly,the entire enclosure is placed into a l0-tonpress to assure that all bonded surfacesmake contact and are held in place whilethe adhesives cure.