Not to nitpick, because the mod has been more than gracious in dividing auto audio in sections, but "all-out audio" is just one part of after market sound systems. (in fact, "aftermarket audio" would be a good title.
You see, in car sound compettition, there are two categories: Sound Quality and db drag racing (which kind of sounds like "all-out audio"). They are very two different areas with different objectives, techniques and goals. Most people strive for sound quality *although there are those obnnoxious few who insist on playing one-note bass at unreseasonable levels in public* That's not even audio, much less consideration for others.
All-out db racing involves making armoured cars with no windshields, dozens of sub-basses tuned/EQ'ed to be in phase to produce the maximum decibels--period. They're mainly for events and competitions and draw big crowds. The vehicles are hardly driveable, much less listenable.
I think the main topic should be to help old Buick owners to integrate modern electronics maintaining aesthetic/cosmetic and structural integrity. I, myself am NOT any model to follow since my trunk shows off my equipment (although my interior is stealth). Other have worked on old cars, some of which don't show any modifications have been made. But we can suggest things what have worked, and haven't; so people don't repeat the mistakes during my 23 years in high-end mobile audio.
I know many here want to maintain the originality of their old Buicks. That's great. More power to you. Others of us want to put a quality system for our own enjoyment. If Buick had today's technology back then, I'm sure they would have every advancement we currently have. There's so much new: CD, DVD/Audio/Video, Multi-channel sound, GPS navigation, touch panel screens (remember the late 80's Riviera with the revolutionary TV screens?), iPods, MP3, Surius satellite radio, cellular phones, car faxes, On Star; and basic audio reproducing equipment- amplifiers, processors, electronic X-overs, more digital connections, wiring and the most important for audio--speakers--get your most bang for your buck in buying the best speakers you can afford.
There's a whole lot we all can learn and share.