I'm referring to the newer range of alpine decks, after the 7998 era. Weak, weak preouts possibly due to cheaper and smaller power supply. Also, depends on the amp's range of preamp input requirements. Some amps like Brax need up to 1/2 (0.5) volt minimum and some like Abyss only need 0.1 volt. Read up a bit about amp designs, you'll understand better how not to generalize amps based on RMS etc.
cjin: American have muscle cars with huge alternators. They can afford to power up amplifiers of these sort. If you put a big amplifier or multiple amplifiers load on a 70-80A alternator in our typical cars, I doubt it will match the performance of how it sounds in the guai lou's car.
Seriously, there's so many factors including quality of amplifier as pointed out by Rosen korkor. Generally, a good 50w x 2 amp with 200w transformer/power supply section 'can sound better' than a cap abang 100w x 2 amp with ngam ngam 200w ps. So perhaps you can help us further by telling us what amp you're planning to use and why can't the shop advice you accordingly?
