The size printed on the speaker box doesn't tell you. Depth does. Here's how to measure your speaker, what room the CB7 front door gives you, and how adapter thickness and weather cups change the numbers.
Why the advertised size isn't enough
Two speakers sold as the same size can have different mounting holes, basket shapes and depths. In a CB7 front door, the limit that usually decides the fit is depth: how far the back of the speaker reaches toward the window glass, and how far the front sticks out toward the door card.
A speaker adapter moves the speaker forward. That adds room behind it but takes room away in front. Picking the right thickness is a balance between the two.
What size are the factory front speakers?
It depends on the trim and audio system:
| 1990–1993 Accord (CB7) | Factory front-door speaker |
|---|---|
| DX / LX | 6.5" (165 mm) |
| EX / SE | 5" (127 mm) on some configurations |
| Bose-equipped | 4" (100 mm) on some configurations |
Our adapters are made for the 6.5-inch front-door opening. If your car came with a smaller factory speaker, tell us your trim and audio system, or send a photo of the door with the speaker out, before you order. The next-generation 1994–1997 Accord (CD) uses 6.5" (165 mm) front-door speakers, but our adapters are designed for the CB7 door.
How much room the CB7 front door has
These are measurements from one owner-tested CB7 front door. They're a starting point, not a guarantee for every car.
| Measurement | mm |
|---|---|
| Door mounting flange to window glass, without a weather cup | 49 |
| Door mounting plane to interior door card | 28 |
| Weather cup flange to bottom | 47 |
| Weather cup total height | 49 |
| Weather cup upper step depth (magnets up to 108 mm wide) | 40 |
| Weather cup lower section depth (magnets up to 94 mm wide) | 46 |
Measure your speaker
You need three numbers, in millimeters, plus the exact model.
- Rear depth. From the underside of the speaker's mounting flange to the deepest point at the back, including terminals that stick out.
- Magnet diameter. The widest part of the magnet. You only need this if you're using weather cups.
- Front height. From the mounting flange to the highest point at the front, including a raised tweeter.
- Brand and full model number. This lets us check the mounting-hole pattern and other details.
Many speaker spec sheets list a "mounting depth". Check that it's measured from the underside of the flange, and measure the speaker yourself if you can.
Without weather cups: the math
Adapters come in 12, 17 and 22 mm. With adapter thickness T, rear depth D and front height P:
- Room behind the speaker:
49 + T − D - Room in front of the speaker:
28 − T − P
Here's an example speaker that's 55 mm deep with an 8 mm front height:
| Adapter | Room behind | Room in front | Result |
|---|---|---|---|
| 12 mm | 6 mm | 8 mm | Room on both sides |
| 17 mm | 11 mm | 3 mm | Tight in front |
| 22 mm | 16 mm | −2 mm | Hits the door card |
For this speaker, the thinnest adapter is the best choice. A deeper speaker would push you toward 17 or 22 mm, as long as the front still clears the door card.
With weather cups
Weather cups sit behind the speaker and help keep water that runs inside the door off the back of it. The adapter sits between the speaker flange and the cup flange, so it adds room inside the cup.
The cup has a stepped inside. Magnets up to 94 mm wide fit into the 46 mm deep lower section. Magnets over 94 mm and up to 108 mm stop at the 40 mm upper step. Magnets wider than 108 mm need a custom review.
- Room inside the cup:
cup depth + T − D
The same 55 mm deep speaker with a 90 mm magnet uses the 46 mm depth:
| Adapter | Room inside the cup | Result |
|---|---|---|
| 12 mm | 3 mm | Tight |
| 17 mm | 8 mm | Room to spare |
| 22 mm | 13 mm | Room to spare |
In the tested car, the installed weather cup sat 2–3 mm from the window glass with full window travel. That's an observed gap in one setup, so don't count on it for every door.
Positive numbers don't guarantee a fit. Basket shape, terminals, magnet position, mounting holes and door trim can still get in the way. That's why we review each speaker before recommending an adapter.
Check your own speaker
The CB7 Speaker 3D Fitment Center runs this math for all three thicknesses, with or without weather cups. Pick your speaker from the list or enter your numbers, see it in the door in 3D, then send the results to us with your speaker model for a fitment review. No payment is needed to ask, and we reply within 2 business days.
Common questions
What size are the factory front speakers?
6.5" (165 mm) on DX and LX models. Some EX/SE configurations use 5" (127 mm) and some Bose-equipped cars use 4" (100 mm). If yours is smaller than 6.5", check with us before ordering.
Will 6.5-inch speakers fit a CB7 front door?
It depends on the speaker, not the size label. Two 6.5-inch speakers can differ in depth, basket shape and mounting holes. Measure the rear depth and front height and run them through the numbers above, or send us the model.
Do I need weather cups?
They're optional. They help keep water inside the door off the back of the speaker. If you use them, check the magnet diameter: up to 94 mm uses the 46 mm depth, up to 108 mm uses the 40 mm step.
Which adapter thickness should I choose?
A thicker adapter gives more room behind the speaker and less in front. Pick the thinnest one that leaves room behind the speaker, then confirm the front still clears the door card.
Are screws included?
The adapters reuse your car's original door screws, and matching door-side spacers are included. Replacement screws aren't supplied.
What are the adapters made of?
Each adapter is a single piece of black PETG, sold as a pair and made to order in San Diego.
Do weather cups come with the adapters?
No. The weather cups are a separate product, sold as a pair.