I tried google myself as soon as you posted here thinking you hadn't done any research. However I came up with the same results as you did. Several non-definitive answers, and since I don't own a 6th gen myself I didn't know from experience so I thought I'd let another user answer your question.

Glad to see you searched before, and more power to you for posting. I'm sure someone here will help you!

 

The rear speakers were easy to figure out. But I might could fool with the front speakers at a later time. As since my Monte doesn't have an amp, the factory speakers are 4 ohms. So, I should be fine with an aftermarket head unit and aftermarket rear 6x9" speakers and still be able to use the front stock speakers since they are 4 ohm. Since there is no amp, I also get to use the factory wiring as well.

I may pull the speaker housing out and take it to an audio shop to see if they can match up a type of speaker that would bolt in. But I'm guessing there probably will have to be some mod work done. Though I might could also go with a 5.25" speaker since I think that is smaller than the factory speaker and try installing it with an adapter.

 

My research was thorough which is why I came across at least 4 different sizes mentioned for the front door. I even looked at Crutchfield which listed several different sizes. Some on the board mentioned dropping in 6.5" others said the 6.5" didn't fit. Some said the speaker was a 6" others 5.25" or even 6.75". It sure did make it hard to order.

The problem is the outer ring on the 6.5" speakers I have hits the casing. So you couldn't even set the speaker down flush. I'm not going to hack the casing up though. The other problem was the mounting holes didn't line up with the casing. To get it to work, you'd have to hack the casing up and re-engineer a way to mount the speaker.

I'm going to keep looking around. But I think the best thing is to take the casing to a car audio shop and test fit different speakers.

If none of that works, I'm thinking a 5.25" speaker with mounting plate might could work. That is if the mounting plate lines up with the mounting holes on the case.

 

It does have the stock bezel and also the small tweeter as well.

I'll call around the audio shops and see what size speakers they have available to pop in the bezel to find what size works. That way I'll know for sure.

Though, it could be one of those deals where the bezel is shaped for that speaker, so an aftermarket speaker might not fit correctly. Though, I'm going to try and find something that bolts in.

At least the rear speakers are direct bolt in with no problems.

I'm probably going to go with a Pioneer system and run the speakers off the head unit.

 

i put 6 1/2s in my doors so problem. no modification at all. thats wierd that yours didnt fit..

 

You must not have researched as there are several different sizes mentioned on this board for the front door speakers. Some have even said 6.5" were too big. That's the reason why I posted because there are so many different sizes mentioned on this board and everywhere else that I wasn't sure what was correct.

And yes, Crutchfield doesn't know either. Here are the sizes they list in the results when I look under "front door":

5 1/4"

6 1/2"

6 1/2" / 6 3/4"

7"

7/8" tweeter

1" tweeter

3/4" tweeter

According to Scosche and Sonic Electronix the front door is 6 3/4".

This speaker guide says 5.25":

http://www.americaninternational.net...ide_7-06_s.pdf

I'm going to try some different 6.5" speakers at a shop to see if I can find some that bolt in.

 

I noticed the OEM speakers have some kind of tape/gasket on them. I guess to help seal the speaker or prevent rattles. Does anyone put something like that on the replacement speakers? Or just bolt them in as is? I figured something like trim tape could be used.

 

it's called decoupling. it's to keep the resonance that the baffle is receiving from the mid bass from transferring to the door panel. if it does transfer you end up with all kinds of weird sounds.

see that's a fair question.

don't tell me to do my research, i'm not the one who doesn't know how to build a baffle good luck friend.

 

It doesn't matter if I know how to build a baffle or not because I'm not going to build one regardless. The speakers are going to get bolted in their stock location in the factory baffle just like how I want them.

I'll probably get a boom mat and cut the back off so there will be something inbetween the speaker and baffle.