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 shit unless you have major DSP. crossover and EQ work.