MBC MG Under Dash 5x7 Inch Speaker 15 Ohm

BMC MG Under Dash 5x7 Inch 15 Ohm & 4 Ohm Speaker - Classic British Car Restoration

Description
This 5 x 7" fullrange speaker is a faithful reproduction driver designed specifically for under-dash mounting in classic BMC (British Motor Corporation) MG models and similar classic British vehicles. Built with a 15 Ohm primary voice coil, it provides the correct electrical load required by original factory radios (such as vintage Smiths, Motorola, or Radiomobile units). 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 BMC MG and British cars
• Driver Format: 5 x 7" (127 x 178 mm approx.) oval fullrange mono driver
• Primary Voice Coil Impedance: 15 Ohm (for original factory 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 vintage transistor or valve-based factory radios.
• Factory Fitment: Designed to fit original 5 x 7" under-dash mounting locations and brackets in classic MG models (such as MGB, Midget, and Magnette) and related BMC vehicles.
• 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 radio or cutting 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 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 vehicle's factory mounting area.
• Polarity & Grounding: Ensure correct wiring polarity when connecting to positive or negative earth original vehicle systems.