is it a missprint on the web site, or does the rl-p 12 have a significantly lower fs than the 15?....why?

Fs = [6.28(Cms * Md)^1/2]^-1

You can use Mms in that equation for a very close approximation. [Md includes mass of the air]

I ran through the calculations myself. All of them seem spot on. Was within +/- .25hz of each one....the difference is due to using Mms rather than Md I presume.

Fs = [6.28(Cms * Md)^1/2]^-1

You can use Mms in that equation for a very close approximation.  [Md includes mass of the air]

I ran through the calculations myself.  All of them seem spot on.  Was within +/- .25hz of each one....the difference is due to using Mms rather than Md I presume.

<{POST_SNAPBACK}>

to appear cool i will pretend i understood that, now as far as i know 15s SHOULD play lower than 12s? why does the rl-p 12 have a lower fs than the 15?

Fs = [6.28(Cms * Md)^1/2]^-1

You can use Mms in that equation for a very close approximation.

first time ive heard that? i guess i learn something new every day! always thought fs was a good indicator of lowness capability?

Enclosure and enviornment are far more important. Along that line, driver Q is better indicator than Fs. Overdamped speakers (low Q) will tend to have less low end capabilities than a higher Q sub (hence the reason low Q subs are typically best suited for ported enclosures).

Here are a few quotes from Stephen Ponte, formerly of TC sounds:

"Fs is NOT a huge determiner of LFE. Qt is. The higher the Q, the lower the woofer will play - always. The more moving mass, the lower the driver will play (relative to Q). Less BL product (relative to Q). Etc etc etc. "

"Cms, or compliance usually has VERY little to do with how low a speaker will play. Now, keep in mind, that the lower the Fs of a driver is, the lower the Q is - and remember, a high Q always plays lower. So, a low resonance speaker isn't always good" (note here; the 12" Rl-p's have lower Fs', but they also have a lower Q than the 15's).

And here's my favorite one:

"There is NO way to look at driver specs, to know how low a driver will play. You can get a good idea by looking at the Q. But, the BIGGEST factor of LFE, is environment. "

SDP that sonuvab

I've heard that he's working for SVS now??

That's the word, up and left California and headed eastwards towards his home town.

Some slighted feelings on TC's end on account of it all, but we all gotta do what we gotta do. He's a good guy

That's the word, up and left California and headed eastwards towards his home town. 

Some slighted feelings on TC's end on account of it all, but we all gotta do what we gotta do.  He's a good guy

don't lose contact with him, he might be able to help out on things if needed

LMT?

Enclosure and enviornment are far more important.  Along that line, driver Q is better indicator than Fs.  Overdamped speakers (low Q) will tend to have less low end capabilities than a higher Q sub (hence the reason low Q subs are typically best suited for ported enclosures).

Here are a few quotes from Stephen Ponte, formerly of TC sounds:

"Fs is NOT a huge determiner of LFE. Qt is. The higher the Q, the lower the woofer will play - always. The more moving mass, the lower the driver will play (relative to Q). Less BL product (relative to Q). Etc etc etc. "

"Cms, or compliance usually has VERY little to do with how low a speaker will play. Now, keep in mind, that the lower the Fs of a driver is, the lower the Q is - and remember, a high Q always plays lower. So, a low resonance speaker isn't always good" (note here; the 12" Rl-p's have lower Fs', but they also have a lower Q than the 15's).

And here's my favorite one:

"There is NO way to look at driver specs, to know how low a driver will play. You can get a good idea by looking at the Q. But, the BIGGEST factor of LFE, is environment.  "

<{POST_SNAPBACK}>

thanks for the imfo- i could continue asking questions but i wont, if i really wanted to know i would read a book i suppose.i'll just continue on in ignorance and enjoy my sub.......