2 L7 15's vs. 1 RE MT 18"

cone area has nothing to do with it, eh? Then whats the differnce in a 8, 10, 12, 15, 18? Why would they not make them all the same size? Just to take up more room? no. I quote:
"the bigger the cone, the 'heavier' the bass. It's kind of like a xylophone. The higher notes are made of shorter bars whereas the lower notes are made of longer bars. "

"Subwoofers produce bass by moving large volumes of air. It makes sense then that a larger diameter speaker is going to be able to move more air than a smaller diameter speaker. "

And any company is going to rate their RMS as high as they can because it is good for advertisement. So, going over the rms isnt reccomended, ever. I told him to run between 750 and 900 watts per sub on subs rated at 1000 rms. That way, he will be able to play his system loud and not be worrying about damaging subs. (as long as he sets the gain before clipping-points)

So what part of any of that do you call my "B.S. Theories?"

I believe you said that the size area doesnt matter? Well it does. Because thats HOW subs make sound. The larger the area of the cone, the more air it moves, the more air moving, the louder the sound.

What's going to move more air, a 15" sub with an xmax of 2mm each way, or a 12" sub with an xmax of 35mm each way???

//content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

 
No...I'm showing that if you go by sheer cone area, a 15" will have a higher cone area then a 12"...but if you factor in xmax to find displacement, then the 12" will displace more air, due to having a higher xmax.
I believe xmax on the MT and 15L7 are pretty close.

 
I know, I'm just talking in general...in this case, yes, the L7's will outdisplace the MT, but cone area isn't everything, like foote is saying.
Yup, I understood your point. //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

 
I gotcha, I just figured since we were talking about 15's and 18's thats what you meant to put //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 
I never said cone area was everything.
You may not have, but the way that you word things makes it sound like it is impossible for a 12 to EVER beat a 15. I have beat people with 4 times as much cone area as me at events with my cheap little L7. The quality of install is more important than anything, imo.

 
2200 rms is too much for the l7s....
Most people will probably tell you the 18 would be louder. But science proves them wrong. Your pushing the same wattage either way.

With an 18" Circular sub, you are gonna be moving ~254 sq. in. of air. With 2 15" squares, your gonna be moving 450 sq. in. of air, almost twice as much.

So.... you can either have 2200 pushin 254 or 2200 pushin 450. Id go with the 450. //content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

But lower the wattage to 1500-2000.
Wrong

XMax of 18" XXX = 54mm = 2.13in

XMax of 15" L7 = 16.25mm = .640in (http://www.thielesmall.com/database.asp)

Now multiply cone area with the XMax to find the total volume displaced at full excursion.

XXX: 2.13 x 254 = 539 in^3 of air at max excursion

L7: .640 x 450 = 288 in^3 of air at max excursion

So yeah........ //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

 
Wrong
XMax of 18" XXX = 54mm = 2.13in

XMax of 15" L7 = 16.25mm = .640in (http://www.thielesmall.com/database.asp)

Now multiply cone area with the XMax to find the total volume displaced at full excursion.

XXX: 2.13 x 254 = 539 in^3 of air at max excursion

L7: .640 x 450 = 288 in^3 of air at max excursion

So yeah........ //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif
Thats it? For some reason i think its a little more than that. Maybe thats 1 way?

 
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