JBL 4638TH Low Frequency Theater Loudspeaker System, 4 Ohm Impedance, 600W Power Capacity

The JBL 4638TH employs the latest low frequency transducer technology offering exceptional performance benefits. The JBL 2035H 380 mm (15") transducer employs a copper-sleeved magnetic pole piece providing a stabilized magnetic field, which provides lower second and third order harmonic distortion and flat power response. The copper-sleeved pole piece reduces flux modulation and acts as a shorted turn causing the impedance curve to flatten at higher frequencies. This helps in maintaining a smooth transition between the low and high frequency devices in the crossover region producing, among other things, accurate reproduction of dialog throughout the entire listening area.

The JBL 4638TH utilizes a new 600 watt IEC pink noise rated crossover, which features Constant-Coverage horn equalization for both 2380A and 2360A Series Bi-Radial horns. The enclosure is constructed of dense stock and is extensively braced on all panels reducing cabinet resonances. Net internal volume is 2251(8 cu ft) and the enclosure is tuned to 40 Hz with large port tubes, ensuring minimum turbulence at full power input at low frequencies.