JBL 3678
JBL 3678

JBL 3678 Screen Channel System The 3678 screen channel system can be used in either the passive mode or in a bi-amplified system. THX-approved for THX system applications.

  • Low Frequency Transducer: One 380 mm (15 in) low frequency driver.
  • High Frequency Transducer: 25 mm (1 in) horn throat diameter, 44 mm (1.75 in) pure titanium diaphragm compression driver.
  • Flat power response 100° x 100° Bi-Radial® horn.
  • Operable in bi-amp or passive mode.
  • Includes adjustable bracket for horn aiming.
  • Shallow profile cabinet minimizes behind-screen space requirements.
  • THX® - approved for THX system installations (biamplified only).

Frequency Range

30 Hz to 20 kHz (-10 dB)

Frequency Response

45 Hz to 12 kHz (+/- 3 dB)

Power Capacity (Continuous Pink Noise)

300 W Passive HF: 50 W Bi-Amp LF:600 W Bi-Amp


98 dB (1W, 1m)

Nominal Impedance

8 Ohms

Crossover Frequency

1 kHz

Nominal Coverage

90° Horizontal, 90° Vertical

Half-Space Reference Efficiency


Maximum Acoustic Power Output

8 Acoustic W (Sine Wave Input)

System Polarity

Positive Voltage to RED produces forward cone motion

Input Connectors

Barrier Strip Screw Terminals

Dimensions (H x W x D)

1019 (w/horn) x 651 x 292 mm
(40.125 (w/horn) x 25.625 x 11.5 in)

Net Weight

41 kg (90 lb)

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Our office hours are 9:30am-5:30pm weekdays — please drop by, call us or fill in the contact form so we can reply to you shortly.

Magna-Tech Electronic Co., Inc.
6114 NW 74th Ave.
Miami FL 33166 USA
Phone: (305) 573-7339
Fax: (305) 573-8101
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