SISTEMA JBL PROFESSIONALE HOME CINEMA

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Sistema usato JBL professionale per home cinema composto da:
- n.3 Diffusori JBL 4648A + 2446H
- n.3 Trombe JBL 2380A


JBL 4648A Loudspeakers
The JBL 4648A low frequency system is designed for general reinforcement and motion picture theater use where high power output with smooth power response and low distortion are essential. The 4648A system covers the frequency range from 35 Hz to 500 or 800 Hz, depending upon application. The 4648A 4 ohm system uses two 2226H 380 mm (15 in) patented Vented Gap Cooling transducers for high power handling and reduced power compression. The tranducers feature 100 mm (4 in) voice coils operating in a large symmetrical field geometry magnet structure to reduce a second harmonic distortion to inconsequential levels. The total linear excursion capability of each transducer is 10 mm (0.4 in), peak to peak, and total harmonic distortion (THD) is less than 2.5% from 40 to 800 Hz with sine wave input of 100 watts. The enclosure is constructed of dense stock and is extensively braced on all panels. Net internal volume is 225 l (8 cu ft), and the enclosure is tuned to 40 Hz. Port area is large, ensuring minimum turbulence at full power input at low frequencies.
Model 4648A is the 8 ? version of this system, incorporating two 2226J transducers, used with models 4675B-2 and 4675B-8LF high frequency systems.

Key features:
- Usable Response to 35 Hz
- 100 dB Sensitivity, 1 W, 1m
- 1200 watts Power Capacity
- Direct Radiator Ported Enclosure
- Two 380 mm (15 in) Low Frequency Transducers

JBL 2446H Compression driver
The Model 2446H is a professional quality high-frequency compression driver that incorporates JBL s newly developed Coherent Wave phasing plug as well as a pure titanium diaphragm with radial ribs and patented three-dimensional diamond pattern suspension. The Coherent Wave phasing plug assembly consists of four die-cast annular aperture structures of constant path lenght to provide m-phase combining of diaphragm output at the driver's exit. This optimized configuration allows coherent summation of acoustical power up to much higher frequencies than afforded by earlier designs.
The diaphragm design includes JBL s exclusive three-dimensional diamond pattern surround which reduces membrane stresses in the diaphragm support structure and extends diaphragm life. The depth of the diamond pattern is closely contolled during the manufacturing process to provide predictable frequencies for the 2nd and 3rd normal resonance modes and for the basic suspension resonance mode. The diaphragm also incorporates a series of embossed radial reinforcing ribs that increase diaphragm stiffness. This diaphragm, when combined with the Coherent Wave phasing plug, increases the 2446H s output in the 5 kHz to 20 kHz range.
Key features:
- 100 watts continuous program at 500 Hz
- 150 watts continuous program at 1 kHz and higher
- Coherent Wave phasing plug design for increased high-freqeuncy output
- 100 mm (4 in) pure titanium diaphragm with radial-rib topology and patented three-dimensional diamond pattern suspension
- 100 mm (4 in) edgewound aluminum voice coil
- 49 mm (2 in) throat exit diameter

JBL P749 Subwoofer
ACOUSTIC & ELECTRICAL SPECIFICATIONS
Nominal impedance: 4 Ohm
Power rating: 1400 W AES
Frequency response: 35 Hz - 1.5 kHz
Sensitivity: 102 dB (1m, 2V)
Crossover frequency: Active C236

SYSTEM COMPONENTS
Cabinet: CP749
Grill: GP749
Low frequency transducer: 460 mm (18 in) cone transducer (2243H)
DC Resistance: 5.2 ? +/- 10% Copper wire

PHYSICAL SPECIFICATIONS
Enclosure dimensions: 1140 x 675 x 480 mm
Shipping weight: 85 kg (187 lb)