Taking speakers of equal sensitivity, to double the perceived loudness (an increase in 10dB at 1m) one would need to increase the amperage by 10 fold...
I've lost the key fob from my trouser pocket a number of times only to find it nestling in the fabric fold twixt seat and transmission tunnel. Excellent design tweak by Lexus
Just to clarify, do you mean high beam assist or adaptive high beam? The former simply changes from high beam to dip and back depending on traffic and street lighting, the latter will maintain high beam but blank areas to avoid dazzling other vehicles, the beam spread changing dynamically but generally appearing to be on high all the time
No, I had the premium set-up with 10 speakers. Not sure the number of speakers dictates the sound quality, more the distribution within the cabin. Aren't the amplifiers the same, standard and premium, only the ML has the 'better' more powerful amp?