I concur, ASL = Automatic Sound Leveling. The volume is automatically raised or lowered according to ambient sound levels. It does not affect the equalization at all. ;)
Hey guy's.....In defense of what member Jon E O hears, are you certain that the Mark Levinson does NOT use any type of EQ in the ASL portion of their sound control?
I say this because I did work on some of the largest Disco sound systems in the New York....namely "Studio 54" for one, which did use "Acoustic Voicing", which DOES use modified EQ curves depending on volume.
Even some pre-amps use or used "Loudness Controls" in it's simplest forms to boost the bottom or top ends of the frequency spectrum, or both at lower volumes to compensate for normal hearing losses.
Like I said in my above post, the only way to be sure that the ASL is anything more than just a plain old volume control circuit is to use test equipment to verify it.