3678 (discontinued)

Screen Channel System

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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).


  Version Language Size Uploaded
Data Sheets
file type icon 3678 Setup Instructions
updated: Oct 2019
    25.4 KB Oct 2019
file type icon 3678 Spec Sheet
updated: Oct 2020
    71.9 KB Oct 2020
file type icon Cinema Sound System Manual
updated: Oct 2020
    2.31 MB Oct 2020
CAD Drawings
file type icon Cinema Products
updated: Oct 2019
    110 KB Oct 2019
file type icon Cinema Sound - 3000 Series Declaration of Conformity
updated: Oct 2019
    144 KB Oct 2019
Tech Notes
file type icon Tech Note: Polarity Conventions
updated: Oct 2019
    55 KB Oct 2019
Information Documents
file type icon Cinema CD
updated: Oct 2019
    21.9 MB Oct 2019
file type icon JBL Professional Model Number Listing:
updated: Oct 2020
    47.3 KB Oct 2020

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Parts & Service


Frequency Range (-10dB) 30 Hz to 20 kHz (-10 dB)
Frequency Response (±3 dB) 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
Sensitivity 98 dB (1W, 1m)
Nominal Impedance 8 Ohms
Crossover Frequency 1 kHz
Nominal Coverage 90° Horizontal, 90° Vertical
Half-Space Reference Efficiency 3.3%
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 (each) 41 kg (90 lb)
Power Handling (2Hr AES Rating) 300W


HARMAN Professional Solutions: