Thumbnail Filmstrip of Holden Torana LC LJ Under Dash 5x7 Inch Speaker 15 Ohm Images

Holden Torana LC LJ Under Dash 5x7 Inch 15 Ohm & 4 Ohm Speaker - Air Chief Radio Restoration

Description
This 5 x 7" fullrange speaker is a faithful reproduction driver designed specifically for under-dash mounting in classic Holden Torana LC and LJ models (including S, SL, GTR, and XU-1 variants). Built with a 15 Ohm primary voice coil, it provides the correct electrical load required by original factory Air Chief roller radios requiring 15 to 16 Ohms. It also features an independent secondary 4 Ohm voice coil, allowing enthusiasts to connect a hidden modern Bluetooth receiver or auxiliary system to the same physical dashboard speaker without altering the original interior layout.

Technical Specifications:

Application: Under-dash speaker replacement for classic Holden Torana (LC, LJ)
Driver Format: 5 x 7" (127 x 178 mm approx.) oval fullrange mono driver
Primary Voice Coil Impedance: 15 Ohm (for original Air Chief factory or other radios requiring 15 to 16 Ohms)
Secondary Voice Coil Impedance: 4 Ohm (for modern auxiliary or Bluetooth sources)
Power Handling: 15 W
Dust Cover: Black cloth
Mounting Hole Pattern: 110 x 110 mm
Baffle Cut-out: 118 x 170 mm (approx.)
Mounting Depth: 50 mm (approx.)
Total Height / Depth: 57 mm (approx.)
Overall Length: 183 mm (approx.)
Overall Width: 129 mm (inner frame) / 126 mm (across mounting tabs)
Supplied As: Single unit (1 speaker)

Vehicle Compatibility & Dual Voice Coil Features:

Original Radio Matching: Correct 15 Ohm impedance prevents overheating and output stage damage in factory Holden Air Chief radios.
Factory Fitment: Designed to match original 5 x 7" under-dash mounting locations and factory bracket setups in LC and LJ Torana models (S, SL, GTR, and XU-1).
Secondary 4 Ohm Auxiliary Input: Allows a discrete secondary modern audio source (such as a hidden Bluetooth module or modern 4 Ohm receiver) to drive the same speaker location without replacing the factory Air Chief radio or modifying original dash panels.

Installation & Vehicle Fitment Warnings:

Do NOT Combine Coils: Never connect the 15 Ohm and 4 Ohm voice coils together on the same channel or amplifier. They must remain completely separate circuits to prevent severe signal distortion and coil damage.
Check Radio Impedance Requirement: Confirm your original Air Chief radio specifies a 15 Ohm or 16 Ohm load before connecting to the primary coil. Standard modern 4 Ohm stereo radios must be connected to the 4 Ohm terminals only.
Under-Dash Clearance Verification: Check under-dash space, wiring loom clearance, and bracket alignment prior to installation. Ensure depth (50 mm) and cut-out size (118 x 170 mm) match your Torana's factory mounting area.
Polarity & Grounding: Ensure correct wiring polarity when connecting to original vehicle speaker looms.