Should I convert the 15" to an 18"

[zachzchw 5,000+ posts]

Before you do anything drastic with that XXX build a new box... trust me on this one...

Youve mentioned that Noah builds boxes, think he could build a snail shell?

 

[BeanII 10+ year member]

Bean, so a pair of 15"s getting 750 each would be louder than one getting 1500? Wouldnt the reduced power play into it?

In my experience with building and designing car systems (which is well past a long *** time) this would play a little louder. Keep em' ported though. I think you'd be happier with this as opposed to the 18.

Sorry, this thread started out as a poll. Didn't mean for it to go here.

 

[zachzchw 5,000+ posts]

Sorry, this thread started out as a poll. Didn't mean for it to go here.

Not a problem. Id rather get steered in the right direction as opposed to waste the time/money doing an upgrade that isnt really too much of an upgrade...

 

[UndercoverPunk 5,000+ posts]

Youve mentioned that Noah builds boxes, think he could build a snail shell?

Doubtful, and I don't think there are many people outside P4S that can as they keep the design all hush hush.

 

[zachzchw 5,000+ posts]

Doubtful, and I don't think there are many people outside P4S that can as they keep the design all hush hush.

Theres designs leaked out now..... I found one for the 15" xxx, I figured someone who understood the concept behind it could make the appropriate correction for an 18"....

 

[UndercoverPunk 5,000+ posts]

Theres designs leaked out now..... I found one for the 15" xxx, I figured someone who understood the concept behind it could make the appropriate correction for an 18"....

You can send it to him, but you'd probably need one for an 18" driver. The designs I saw leaked were said to be hit or miss.

PM him... I'd still build a new box for the 15 before you got the rebasket and cone...

 

[djjdnap 10+ year member]

wtf, i called last week and they said they weren't getting any 18's until 3 weeks:uhoh:

 

[audioholic 5,000+ posts]

Seems wierd that they would do this considering the costs. It's gotta be cheaper for them to just trade you out.......doesn't matter...
As for going up to the 18? Nevermind space and power, cause the needs are not that dramatic. What are you looking to gain? If you expect a huge increase in volume, it won't be there. Theory says, double cone space = 3 dB. 15 to 18= inaudible volume change.

good luck

Why would it cost less to replace the WHOLE thing? That makes zero sense. Or are you suggesting RE would then turn around and sell a used motor as new? //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

And the cone area thing, you really don't know what you're talking about. I dont know where you are getting your info, but switching from a 15 to an 18 will hardly be 'inaudible'. You yourself said a doubling of cone area will result in a 3db increase (very dramatic). You do realize an 18 has approximately 70% more cone area than a 15 right? A 100% increase would be +3dbs (again, rather dramatic), but an increase of 70% cone area would only produce inaudible results? hmmm okay. If you want to talk in terms of theory, the change should result in about a 2db difference (all other factors besides cone area being the same.. including enclosure alignment)... which is most definitely audible. Not to mention the low end output would increase quite dramatically. If you think going from a 15 to an 18 would produce inaudible results, why do you think they even make an 18? Do you also feel going from a 12 to a 15 is inaudble? If not, why? if so, why bother making a 15? If going from a 12 to 15 is inaudible, is going from a 12 to a 10 also inaudible? If not, why? If so, why bother making anything other than 10" subs? Seriously, your logic makes no sense.

 

[djjdnap 10+ year member]

^^^so why do they make a 32in sub?

and maybe thats why the w7 is louder than most 12's because it has more cone area //aha:wacky://content.invisioncic.com/y282845/emoticons/imdaman.gif.bc6c552e19aa4ad8c47461144f40eb1a.gif

 

[audioholic 5,000+ posts]

^^^so why do they make a 32in sub?and maybe thats why the w7 is louder than most 12's because it has more cone area //aha:wacky://content.invisioncic.com/y282845/emoticons/imdaman.gif.bc6c552e19aa4ad8c47461144f40eb1a.gif

Now you are comparing different brands/models of subs, where displacement comes into play (cone excursion). We were comparing a 15" xxx vs an 18" xxx where cone excursion would be the same (iow all displacement characteristics would be the same besides the cone area). And.. Im not following your logic. I am stating they produce bigger subs BECAUSE they make audible differences. So your question should be directed at someone suggesting the cone size wont make an audible difference, not the guy (me) stating just the opposite.

And for the record, the 32 and 34" subs ****. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

Your W7 comment is just confusing. You dont even mention a size. Irrelevant comment.

 

[BeanII 10+ year member]

Why would it cost less to replace the WHOLE thing? That makes zero sense.

The labor necessary to remove and replace the motor. Like I said, no big deal.

Or are you suggesting RE would then turn around and sell a used motor as new? //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

Not suggesting anything, don't know what they'd do with it.

And the cone area thing, you really don't know what you're talking about. I dont know where you are getting your info, but switching from a 15 to an 18 will hardly be 'inaudible'. You yourself said a doubling of cone area will result in a 3db increase (very dramatic). You do realize an 18 has approximately 70% more cone area than a 15 right? A 100% increase would be +3dbs (again, rather dramatic), but an increase of 70% cone area would only produce inaudible results? hmmm okay. If you want to talk in terms of theory, the change should result in about a 2db difference (all other factors besides cone area being the same.. including enclosure alignment)... which is most definitely audible. Not to mention the low end output would increase quite dramatically.

Yes I understand the cone area gained from a 15 to an 18 and so on. But, you're wrong............ The human ear can only determine differences in volume of 3 dB or greater. 3 dB is quite alot of increase. As for low end output? From a 15 to an 18? How low do you need to go? There's not much music below 30Hz anyway.

Frankly, I don't care if he goes to an 18. It's his car. But, if I were him, I'd do two 15's. That's all.

Thanks! these are the threads that I enjoy on this forum. Sure beats the nonsense about emo's, monopoly, and how do I hook up my alarm to my stereo or fishtank or whatever.

haha thanks!

 

[BeanII 10+ year member]

And for the record, the 32 and 34" subs ****. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

ahaha //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[djjdnap 10+ year member]

lol, i meant 13in w7 sub..//content.invisioncic.com/y282845/emoticons/uhoh.gif.c07307dd22ee7e63e22fc8e9c614d1fd.gif

.

.

//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[squeak9798 5,000+ posts]

Okay,Here's what I'd do. Now I'm not real familiar with your Adire amp, so if I'm wrong let me know and I'll do a little more research.

Okay, The XXX are dual 2 ohm right? Wire em up in series giving you 2 four ohm woofers. Parallel those together to the mono (right?) Adire REVO.

Same power, double cone space = louder.

make sense?

Plus, you'll have two woofers

Nope. Wouldn't work. The Revo makes it's power at 1ohm, not 2ohm. You'd only be giving each XXX ~500w RMS. Which, if you know the XXX, you would know that 500w would barely even move it.

Anyways....as for the 15 to 18 thing; the difference will surely be audible.

 

[audioholic 5,000+ posts]

The human ear can only determine differences in volume of 3 dB or greater.

Incorrect.