1970 LeSabre
 

Anyone know the size of the 2 speakers? Front center of dashboard and rear speaker in center of seat. Thanks.

Now does that bring back memories. I'd speculate 5"x7" or 6"x9", Bose has the self amplified replacement speakers and that setup with reverberation would be killer, forget about stereo.

Something like in photo but may want to keep existing possibly AM only radio (no Sirus)?Wouldn't help much then and may want to stay original? Oh wait, were still connecting one side of speaker to ground back in '70. Would fry any new system putting in as such. Diagram in post #2, may not have pixel space here.

Post #2- old system schematic, well it's wiring diagram. Hello alternator whine and crackling spark plug sound lol.