What determines a tweeter to be loud?

[kylemarsound]

hello just looking for a loud tweeter ill be using 800rms subs 4ohm and I know they will have a really deep punch but I'm looking for a nice loud tweeter. So far I know metal ones such as the aluminum tweeters have a higher volume. But what about RMS wattage? And what the difference between 3/4" vs 1" tweeters?

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[Jeffdachef 5,000+ posts]

sensitivity ratings is what matters not rms or wattage. 92+ db sensitivity tweeters are above average. 89-91 is pretty average and 88 and under is piss poor. There's a lot of super tweeters that are in the 108 db sensitivity ratings and will tear apart your ear drums but they sound like **** unless you have major DSP. crossover and EQ work.