Description

JBL 4648A-8 THX Approved Dual 15" Low Frequency Loudspeaker System

More information from JBL

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 TM transducers for high power handling and reduced power compression. The transducers feature 100 mm (4 in) voice coils operating in a large symmetrical field geometry (SFG) 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-8 is the 8 Ohm version of this system, incorporating two 2226J transducers, used with models 4675B-2 and 4675B-8LF high Frequency systems.

Model 4648TH is a 4 Ohm system, with built-in Crossover network.

Features:
Usable Response to 35 Hz

100 dB Sensitivity, 1 W, 1 m

1200 Watts Power Capacity

Two 380 mm (15 in) Low Frequency Transducers

Direct Radiator Ported Enclosure

Specifications:

• 
  COMPONENTS:1-JBL 4508A low Frequency enclosure2-JBL 2226 low Frequency transducers(Note: Components may be ordered separately for field assembly.)
• SYSTEM SPECIFICATIONS:
• Rated Impedance: 4 Ohms (4648A, 4648TH) 8 Ohms (4648A-8)
• Minimum Impedance: 3.5 Ohms (4648A, 4648TH) 7 Ohms (4648A-8)
• Input power ratingl: 1200 Watts, continuous Pink Noise
• Axial Sensitivity: 100 dB, 1 W, 1 m
• Lower Frequency limits:-3dB: 45Hz-10dB: 35Hz
• Half-Space reference efficiency: 7 %
• Maximum continuous acoustical power output (Sine Wave input): 28 Watts
• Maximum continuous SPL (Sine Wave input):Half-space at 1 m (3.3 ft): 126 dBHalf-space at 3 m (10 ft): 116 dBHalf-space at 30 m (100 ft): 96 dB
• Recommended Crossover frequencies:High-pass: 40 Hz, 12-dB/octaveLow-pass: 500 or 800 Hz, 12- or 18-dB/Octave
• System polarity: Positive Voltage to black terminal produces forward cone motion
• Input connectors: Color coded push terminals
• Net system weight:62.2 kg (137 lb) (4648A, 4648A-8)62.2 kg (137 lb) (4648TH)
• Shipping weight:66.7 kg (147 lb) (4648A, 4648A-8)68.1 kg (150 lb) (4648TH)
• ENCLOSURE SPECIFICATIONS:
• Materials and finish: 19 mm ( inch) particle board with 25 mm (1 in) baffle; matte black finish
• Enclosure Volume: 225 l (8 cu ft)
• Vent tuning Frequency: 40 Hz
• Dimensions: 991 mm x 648 mm x 451 mm, H x W x D (39 in x 25 in x 17 in)
• Net weight: 42.7 kg (94 lb)
• Shipping weight: 47.2 kg (104 lb)

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