JBL Stage1 621 Complete Speaker Replacement Kit - Customer Ratings & Reviews

Not worth it

I had to cut out for the tweeter to fit and since the speakers I purchased could not be deck mounted, I had to cut the speaker hole larger as well so the speaker cone would not be obstructed. For the amount of cutting I had to do, I would just as soon make one from scratch out of 1/4" hardboard.

Great adapters.

Great for any component set just apply some baffles and you'll have great sound quality.

Perfect for me

These worked great and even take the 6-3/4 components.. glad they were so pocket friendly

Nice speakers

Great sounding speakers

awsome product, Great Seller !!!

Product is very well made, durable and does the trick !!! Sellers were awesome to deal with, NO hassels and super quick shipping !!! A++++, will buy again :)

great fit

these fit with no issues or concerns, great product quality!

Metra Speaker Mounting Adapters...worked

This product worked as advertised and was well worth the money.

Worked well, However.....

The instructions described enlarging the mounting holes via an exacto or snap knife, which did not work. I had to use a jigsaw (fine tooth metal blade,) & smoothed the edges with a Dremel.

The installation worked.... But:

I actually thought of taking my finished project to a metal shop to fabricate a flat, sheet metal version, which would be a lot more secure & sound a whole lot better

Great product with a little modification

After a little bit of trimming and adding some Dynamat the bracket it worked perfectly to adapt a 6.5 speaker to a 6x9 space in a 2008 Nissan Rogue.

Good value

Used these in the rear of my car so I could install 6.75" separates instead of 6x9's. Great functionality but the concentric knock outs for the tweeters were problematic and the plate could be stiffer. I would use these again.

2010 Camaro Mounting solution 6x9 to 6.75 separates

Product provided a solution to replace the factory Boston 6x9s with a set of high quality separates in my 2010 Camaro. Could have been a bit larger to offer more options but still worked, just took a slight twist in the cut out. Overall- good product, does not promote vibration, made of ABS plastic, has some degree of flexibility.

Perfect Fit!

Just what I was looking for. I put a set of 6-1/2" components in a 6X9 hole and they sound great!!

Careful!!

Good product, but be careful, I could see it could easily break. I had to enlarge openings for woofer and tweeter for JL Audio components. Used a Dremel tool to further cut out openings, and had no problem. Any sort of a handsaw would break it I believe. As a matter of fact, I think even any jigsaw could work, but you better be good with it.

Great Value

Good overall unit. Has sub woofer control, great sound when coupled with decent speakers and a sub, I like that you can plug your ipod into the rear usb jack and hide it in your glove box. Lots of color schemes to choose from to change the look of the unit to suit your tastes.

Functional

Pros- Fit my speakers, and tweeters. the tweeter adjustment rings were simple and easy to knock out.

Cons- Almost didn't fit in the 6x9 hole and have the screws holes line up with the factory placement in my Honda Civic Coupe. It's not really a Con though, because I did get it to fit with little effort. Very close fit!

I would definitely recommend this product for anyone wanting to put 6 & 1/2 components in the factory 6x9 slots.

Basic speaker adapters

Cheap adapters that can be trimmed, easily allowing a variety of install options. Not very thick, so I only recommend them for factory speaker upgrades, if your putting power to your speaker you might want to either dynamat both sides of this piece or have adapters made out of MDF.

By joshua on December 15, 2017 Verified purchase

Convenient

My car had 6 by 9 openings but I wanted to use a five and a quarter inch component speaker set. This was perfect for me and was not difficult to install

By Anonymous on February 21, 2019 Verified purchase

Randy In Lansing

these are okay as they are when you buy them, But if you wrap them with sound damping then they are great. At first i stalled them normally but there was a rattle when the bass hit, after that i took them out and wrapped them with NVX sound damping and boom they were perfect just like using wood baffles but better because they wont rot or mold.

By Randy on January 8, 2017 Verified purchase

96 Ram 1500 single cab

These adapter plates made it super easy to change out the 6x9's to 6.5's. the pre-drilled mounting holes lined right up, no mods were needed to install a set of JBL GTO 628 coax speakers. I did silicone around them to stop any rattles and put duct tape over the tweeter hole. Good product , highly recommend . Best of all they were free !

By Vintage George on February 22, 2016 Verified purchase

Great adapter, very flexible in their application.....

Not much to say, these do what they are supposed to do, and they do it well. They're very easy to trim or cut if need be, and they come with all of the hardware you'll need. Good price, too.

Good product

For the price can't be beat for ease of installation . Made putting speakers in the factory locations a breeze. Would of been so much more of a hassle with out them.

Best shop ever !!!

good quality product
work great, thanks sonic electronix, the best shop on the net !!!

Good price, is it right for you?

I replaced my factory 6x9s With a set of component 6.5" speakers. The small opening In adapters had multiple pre stamped sizes at the top/bottom that are usable as a template to cut the size necessary to put a tweeter in the same adapter if desired. However the are not like concentric knock outs. It does require some effort and a very sharp tool to get to the desired opening size. I did not mind this at all because it keeps it from being flimsy and gives you a pretty good mounting platform. I would recommend 1 piece baffles be used for sound quality purposes for the 6.5" speaker.

works well but thin

Works well for what they are but it is thin plastic , be warned.

By Michael on June 21, 2017 Verified purchase

Greaat deal

Good, easy to use product. Very inexpensive adapter, especially for cars or motorcycles.

Decent product

Decent adapters but required some trimming to fit the front doors of a 2012 Ram & left gaps around the 6 1/2 Alpine SXE's. Covered the area with some NVX mat & good to go.

Wrong Description

I ordered this product as it said that this will fit Toyota highlander 2017 and guess what I ended up buying and it does not fit, later I come and check what happen the manual of the product shows 6 x 8 fitting website description shows 6x 9, and guess what my return got delined. website description is wrong about the product

By Atish on June 29, 2022 Verified purchase

Wrong item

This was sent for a 2015 f150 Platinum with Sony system. This does not fit it's way too small. I made it work but I shouldn't have had to, the idea behind an adapter is to make it easier to change speaker size. Very flimsy.

By Erin on May 12, 2022 Verified purchase

Great Deal

Grate for 6x9 speaker hole in door makes it easy to in stall round 6.25 or 5.25 mid range speakers and tweeters i would highly recommend to buy speaker these adapter.

By Mark on August 7, 2022 Verified purchase

Worked great

This item worked for me, easy install couldn’t ask for some better.

Perfect fit

Perfect fit in my 2005 Frontier. Fits front or rear speakers.

Fast transaction

Fast transaction fast shipping love doing business with Sonic Electronix

Great Product

If you wish to replace you’re factory speaker with something higher quality quickly and easily without cutting the factory wiring connections this is perfect. No cutting or splicing just plug and play. Can easily put factory speakers back if needed. Suitable for smaller amplifier but wouldn’t run anything high power. Very easy to install. I used them in all 4 doors on a Nissan Versa

Perfect Fit

This was sent as a perfect fit. And it is sturdy enough to hold the speakers where the speakers will last as they should.

By Luiv on March 21, 2018 Verified purchase

Plug n play

Simple and easy to use just plug n play if replacing factory speakers definitely makes install easy and quick

Metra Speaker Harness (72-7401)

Fits and works perfectly on a 2012 Nissan Versa sedan. Made installation much easier.

Great product

The easy installation process would definitely recommend. my speakers sound great.

By Jalai on April 30, 2020 Verified purchase

Great product

Was easy to install and work immediately glad i purchased this item

By Anonymous on October 26, 2018 Verified purchase

Perfect Fit

Exact Fit for mounting new speakers to factory harness without hacking the factory wiring.

Great with the Frontier

Used these for front and back door speakers on a 2023 Nissan Frontier. Worked perfect!

By Nicholas on March 5, 2024 Verified purchase

Perfect for brokies like me

Got quality speakers for my 13yo Kia, old speakers rotted away due to being made of paper. These new speakers A: sound better (duh), B: won’t rot away, C: was just under $60 for two speakers, adapters that needed slight modification, and the wiring harness. Best $56 I ever spent

By Dean on October 1, 2025 Verified purchase

Great Value JBL!

Very good speaker for the price point. Can’t wait to hear them cranked to the max!

By eddie on July 16, 2025 Verified purchase

great quality

They fit perfect for my 07 Lesus es 350 I’m glad I decided to say I had an 07 Lexus ls 460

By Clarence on July 2, 2025 Verified purchase

Sound

By Randall on January 20, 2025 Verified purchase