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Currently running an 18" PSI off 1500RMS. I want to sell this and buy two 15" AQ HDC2.5's and run them off an AQ1200 or SA-1200D. What should be louder? Eventually I'll run a 3rd one but for now just wondering if the change is worth it. Or if 3 of these would be louder than 2 18's.

Grand Cherokee

Team Backwoods Bumpers

DC 15" Level 3's /w 4 Coils

Pioneer deh4200ub

Pioneer 3-ways

Pioneer Tweeters

Pioneer GM-D9500F

Audiopipe 1500.1D @ 14.4v

Clarion Equalizer

Knuconeptz Kollosus 0ga

Knuconpetz Kollosus 4ga

Coming Soon: 270xp / xs1200

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Grand Cherokee

Team Backwoods Bumpers

DC 15" Level 3's /w 4 Coils

Pioneer deh4200ub

Pioneer 3-ways

Pioneer Tweeters

Pioneer GM-D9500F

Audiopipe 1500.1D @ 14.4v

Clarion Equalizer

Knuconeptz Kollosus 0ga

Knuconpetz Kollosus 4ga

Coming Soon: 270xp / xs1200

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Share on other sites

Besides the distribution of power, isnt it a rule of thumb that more cone area in the proper space, will be louder more often than not

without taking into account mounting rings and such

1 - 15 = 176.625

2 - 15 = 353.25

3 - 15 = 529.875

1 - 18 = 254.34

2 - 18 = 508.68

now if both are in same type of box and proper space for each subwoofer, 2 15s should be noticeably louder than 1 18, but 3 15s will probably not be noticeably louder, because its barely more cone area, i know thats not the only thing to take into account, but it may give an idea

more cone area on same power normally results in a louder system, of course due to space requirements that can change based on different types of boxes you decide to use, but if the entire setup was the same in every way and the only changing factor is the cone area, then id say go for more, but if 2 18s are cheaper and/or fit easier, go for that option as its not much different than 3 15s, but if your gonna go with 3 15s for now and upgrade to 3 later on, may as well get the more cone area now

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