Are your speakers in the top of the dash? If so the top dash pad removes without a lot of difficulty. I had mine off to paint it, I don't have speakers in the dash top but the pad looks like it can accomodate them. The pad is made out of styrofoam so be gentle. There are about 5 or 6 screws I think along the rear edge underneath and a few more up at the front near the windshield in the vent slot, remove them and then lift slightly and pull pad to the rear of the vehicle. The pad is attached at the windshield edge with clips. You may have to remove the instrument cluster bezel and the center info panel bezel to get at the screws.
I'm getting ready to replace my speakers too.
I'll be following replies to your post to see what others have had to do.
My shop manual dances around the topic of Bose speakers in the door. My stereo installer believes he would have to remove the window mechanism, or at least loosen it to move it out of the way. BTW - I'm pulling the Bose speakers and installing Infinity Kappa's and amplifier, which means I have to get a harness adapter to change the Bose head unit's output to something the amp can deal with.
Like I said before, you can cut the fiberglass door inner skin. This will allow you to raise the window with the door panel off. Unscrew the mounts to the speaker enclosure, then make a couple of dremel cuts across the inner door frame. Pry (and pray) it up and out.
Do the replacment, then use some JB Weld, or other quick epoxy to put the seam back together. If you go this route, you will have it in and out in no time.
88 Convert ( SOLD ) /1973 coupe 4 speed/1964 Vert!
If memory serves
If you remove all the screws holding the inner door panel ( window up ) and silde the inner door tin skin down to clear the top of the fiberglass door then pull up you get the inner door skin out of the way enough to get at the linkage.
It's the linkage for the door handle which has a plastic lock ( by the door latch machanism )
Go to the dealer and buy a couple of replacements for this plastic bit... mine have broken the instant you apply any pressure on em ( heat age etc)
This will now let the skin drop at about a 30degree angle, just enough to get the speaker out cleanly. Use a bungie cord to hold it up so the rest of the weight doesn't rest on the other piece of linkage ( door lock ).
While your in there.. lube & tighten everything you can find. this is also a good time to replace the outer weather strip.
i talked to my installer yesterday about installing all my orion stuff with a true 6 speaker system and he said it's not that hard of a job to do....we didn't get into the full job but they are good and do top line custom work for athletes and others here in baltimore...can't wait to get all my amps and speakers in along with my new head unit oh and don't forget about the dual 12" subs