4647A Specification Document - JBL Professional

1 4647 ALow frequency SystemProfessional SeriesKey Features: Usable Response to 35 Hz 97 dB Sensitivity, 1 W, 1 m 600 Watts Power Capacity Direct Radiator Ported EnclosureThe JBL 4647A low frequency sys-tem is designed for general soundreinforcement, smaller motion pic-ture theaters, and as an individualmodule in cluster design. Powerresponse is smooth, and axialresponse extends to 1200 system uses the 2226H 380 mm(15 in) patented Vented Gap CoolingTMtransducer for high power handlingand reduced power transducer features a 100 mm(4 in) voice coil operating in a largesymmetrical field geometry (SFG)magnet structure to reduce a secondharmonic distortion to inconsequen-tial enclosure is constructed ofdense stock and is extensively bracedon all panels.

2 Net internal volume is145 1(5 cu ft), and the enclosure istuned to 40 Hz. Port area is large,ensuring minimum turbulence atfull power input at low :COMPONENTS:1-JBL 4507 low frequency enclosure1-JBL 2226H low frequency transducer(Note: Components may be ordered separatelyfor field assembly.)SYSTEM SPECIFICATIONS:Rated impedance: 8 ohmsMinimum impedance: ohmsInput power rating1:600 watts, continuous pink noiseAxial sensitivity:97 dB, 1 W, 1 mHalf-space reference efficiency: continuous acousticalpower output (sine wave input):7 wattsMaximum continuous SPL Half-space at 1 m ( ft): 120 dB(sine wave input):Half-space at 3 m (10 ft): 110 dBHalf-space at 30 m (100 ft): 90 dBRecommended crossover High-pass: 40 Hz, 12-dB/octavefrequencies:Low-pass: 500, 800, or 1200 Hz, 12- or 18-dB/octaveSystem polarity:Positive voltage to black terminal producesforward cone motionInput connectors.

3 Color coded push terminalsNet system kg (83 lb)Shipping kg (91 lb)ENCLOSURE SPECIFICATIONS:Materials and finish:19 mm ( inch) particle board with 25 mm (1 inch) baffle;matte black finishEnclosure volume:145l (5 cu ft)Vent tuning frequency : 40 HzDimensions:775 mm x 546 mm x 448 mmH x W x D(30 in x 21 in x 175/8 in)Net weight: kg (63 lb)Shipping kg (72 lb)1 AES pink noiseJBL continually engages in research related to product improvement, New materials, production methods, and designrefinements are introduced into existing products without notice as a routine expression of that philosophy. For thisreason, any current JBL product may differ in some respect from its published description, but wll always equal orexceed the original design specifications unless otherwise stated4647A Low frequency SystemArchitectural Specifications:The low frequency system shall consist of one 380 mm (15 in)diameter transducer mounted in a direct radiator ported transducer shall be capable of 10 mm ( in) linear excursion(2 Xmax ) and shall be designed to produce a symmetrical magneticfield in the voice coil gap.

4 In addition, a flux stabilizing ring encirclingthe pole piece shall act to reduce flux modulation. The transducerframe shall be of cast aluminum to resist deformation, and the voicecoil shall be wound of copper ribbon 100 mm (4 in) in diameter. Theenclosure shall be 145l(5 cu ft) net internal volume, tuned to 40 Hz,and constructed of dense stock extensively specifications of a typical production unit shall be asfollows: Under hemispherical free-field conditions, measured sen-sitivity (SPL at 1 m ( ft) with 1 W swept input, 100-500 Hz) shall beat least 97 dB. The half-space reference efficiency shall be low frequency response shall extend from 35 Hz ( - 10 dB)and be flat at 45 Hz (- 3 dB).

5 Nominal impedance shall be 8 power capacity shall be at least 600 watts, normal programmaterial. The system shall be the JBL Model 4647A . Other loudspeakersystems will be considered as equivalent provided that submitted datafrom a recognized independent test laboratory verify that the aboveperformance specifications are system half-space (2~) response, one watt at one meteron-axis; system half-space (2~) response, 100 watts at one meteron-axis: distortion raised 20 system off-axis response (0,15,30 and 45 degrees); onewatt at one Index (DI) and Directivity Factor (Q), on-axis,half-space (2a). 4647A system half-space (271) response, 10 watts at one meteron-axis; distortion raised 20 Professional8500 Balboa Boulevard, Box 2200 Northridge, California 91329 A Harman International CompanySS 4647 ACRP 5M10196