Metra 82-7400 Bracket: The 6 to 6.75 Inch Speaker Plate
Quick answer / TL;DR: The Metra 82-7400 is a speaker mounting adapter plate for select Nissan and Infiniti vehicles, sized to take a 6 to 6.75 inch speaker in the factory opening, front or rear. It is a plastic mounting piece, not a wiring harness – the speaker wire or the door harness is a separate part. The plate centers the new speaker in the opening, seals the ring, and carries the mounting bolts without cutting the door.
The Metra speaker adapter bracket 82-7400 is the piece that makes a new speaker physically fit the factory opening, and it is the mounting half of the upgrade, not the wiring half. It is a plate that adapts a 6 to 6.75 inch speaker into the door opening of the select Nissan and Infiniti models it is listed for, front or rear, and the search for it usually comes from a speaker that is almost right – the wrong diameter for the hole it has to sit in.
This is the part view: what the bracket is and is not, the size envelope it covers, the vehicles in its fit list, and the install it changes from a fitment problem into a bolt-on step.
What the Bracket Is, and What It Is Not
| Piece | Job | Contains |
|---|---|---|
| 82-7400 bracket | Centers the speaker in the door opening | Plastic plate, bolt holes, no wire |
| Door speaker harness | Carries the amplifier signal to the speaker | Wire, connectors, no plate |
| Loose speaker wire | The run itself | Gauge wire, no connector |
The split is the first thing to get right, because the search term sits in the middle of three products. The 82-7400 bracket is the mounting plate: it adapts the speaker's bolt circle to the door's opening, so the 6.5 inch or 6.75 inch replacement seats where the factory 6 inch unit sat. It carries no wire and no connector – the electrical path is the door's own harness or the speaker wire that already runs to the door. The bracket solves the mechanical gap, the harness or the wire solves the electrical one, and the upgrade needs the mechanical piece only when the new speaker's diameter differs from the opening's.
The size envelope, 6 to 6.75 inches
The plate is drawn for the 6 inch factory opening that the 6.5 and 6.75 inch aftermarket speakers cannot fill without an adapter. The speaker's magnet and the basket overhang the opening's edge, and the plate sits between them, trimming the effective mounting ring to the opening's shape while presenting the larger bolt circle to the speaker. That is why the part lists the range it covers – 6 to 6.75 – and why a 5.25 inch speaker or an 8 inch sub does not use it: the envelope is the design constraint, and the vehicle's opening sets the lower bound while the popular aftermarket sizes set the upper one.
The Fit List, and How to Read It
The bracket is listed for the 2000-and-newer Nissan and Infiniti models whose door opening matches the plate, and retail listings widen the range to the select 1998-2023 Nissan, Dodge and Hyundai doors that share the same opening geometry. The correct reading is the opening, not the badge: the plate fits the opening it was drawn for, and the fit list is the manufacturer's survey of which vehicles carry that opening. The check that matters is the physical one – measure the door's speaker opening and the factory speaker's diameter, and if the new speaker is larger, the plate is the piece. If the opening itself differs between the door and the list, the other plate in the family is the part, not this one.
Front and rear, the same plate
The listing carries the front and rear doors alike, because the opening geometry is shared in the models it fits. The install is the same at both ends: the door comes off, the factory speaker and its mounting are removed, the plate seats in the opening, and the new speaker bolts to the plate. The rear door adds the weather-seal check, because the rear opening is the one the door's seal meets, and the plate's ring has to sit inside the seal's path or the door will not close flush. The front door is the straightforward version of the same three steps.
The Install the Bracket Changes
| Step | Without the plate | With the 82-7400 |
|---|---|---|
| Remove the door and the factory speaker | Same | Same |
| Seat the new speaker | The larger diameter does not clear the opening | The plate adapts the bolt circle to the opening |
| Mount | The speaker cannot bolt to the door directly | The speaker bolts to the plate, the plate to the door |
| Weather seal | Checked after | Checked – the plate ring sits inside the seal path |
The table is the install delta, and it is mechanical only. The bracket changes the mounting step from impossible to bolt-on: without the plate, the 6.5 inch speaker's basket physically overlaps the door's opening edge and has nothing to bolt to; with it, the plate carries the load and the speaker mounts to the plate's holes. The electrical steps – disconnecting the door connector, routing the wire, reconnecting – are identical with or without the plate, which is the reminder that the bracket is the mechanical half of the upgrade and the wiring is the other half, a separate part or the factory harness.
Choosing the Plate Against the Speaker
- The speaker's diameter against the opening's – the plate closes the gap
- The bolt circle – the plate presents the speaker's circle to the door
- The magnet depth – the door's pocket has to clear it, the plate does not change depth
- The front and rear openings – the same plate where the geometry matches
- The opening measurement first – the plate family is chosen by the opening, not by the badge
The selection runs on three measurements: the opening's diameter, the speaker's diameter, and the speaker's bolt circle. The plate family – this one and its siblings in the bracket line – is indexed to the opening, and the fit list is the survey that says which doors carry it. The magnet depth is the one the plate does not solve, because the plate sits in the opening plane and the pocket behind it is the door's own: a speaker with a deep magnet that clears the opening can still foul the door's inner panel, and that check is the door, not the plate. Run the three measurements and the family choice is mechanical.
Speaker mounting adapter plates in the 82 series are stocked for the common door openings, in the 6 to 6.75 inch envelope; the catalog lists the opening fit and the vehicle range per part number.
Real-World Applications
The door swap in the 2004 Nissan: the factory 6 inch speakers out, the 6.5 inch aftermarket pair in, the 82-7400 plate seating in the opening at the front doors, the bolts through the plate into the door. The Infiniti refresh: the same plate at the rear, the weather-seal ring checked after the plate seats, the door closing flush. The shop bench: the plate in the bin next to the harnesses, the mechanical piece pulled from the shelf when the opening and the speaker disagree. In each the bracket is the gap-closer – the speaker's diameter versus the door's opening – and the wiring stays on its own path, factory harness or new wire, untouched by the plate.
Related reading: The wiring half of the same upgrade, the category view: Metra speaker adapter — metra-speaker-adapter
Related reading: The harness that carries the signal the plate-mounted speaker receives: speaker harness — speaker-harness
Frequently Asked Questions
What is the Metra 82-7400?
A speaker mounting adapter plate for select Nissan and Infiniti vehicles, sized to mount a 6 to 6.75 inch speaker in the factory 6 inch door opening, front or rear. It is the mechanical half of a speaker upgrade – the plate centers and bolts the larger speaker – and it carries no wire.
Does the 82-7400 include the speaker wire?
No – the bracket is a plastic mounting plate with no electrical content. The signal path is the door's factory harness or a speaker wire run separately. The upgrade is the plate for the fit plus the existing or new wire for the signal.
Which vehicles does the 82-7400 fit?
The select 2000-and-newer Nissan and Infiniti models, with retail listings extending to the 1998-2023 Nissan, Dodge and Hyundai doors that share the same opening geometry. The fit is the opening, not the badge – measure the door's speaker opening to confirm before ordering.
Can the 82-7400 mount an 8 inch speaker?
No – the plate is drawn for the 6 to 6.75 inch envelope. An 8 inch speaker needs the sub plate or a different mounting path, because the door's opening and pocket are sized for the midrange drivers, not the 8 inch magnet.
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