Tuning A Box To The Speakers Fs...

[EricM9104]

just wondering, what results would be seen if a 15" (specific is a Memphis PR-15D4) which its Fs is 27Hz and putting four of those subs in a box tuned to 27Hz? Is that kind of tuning ideal for SQ?

Also, what about tuning a box for flat response? Or does that take more trial and error?

[Decaf]

fs is the resonant frequency of a speaker in free air (not in an enclosure). At resonance, the speaker's impedance increases dramatically. The speaker's impedance may go from 4 ohms to more than 20 ohms at resonance.

for a ported enclosure. You should notice that, unlike sealed enclosures, the impedance is lowest at the resonant frequency

well you would loose bass in the 55-80hz range but gain crazy low end bass

you would just need to be careful because at the enclosures f3, the speaker will be getting alot of power still and sometimes you can have too much excursion, bottom out and flatten the vc

but ud be creating a low end monster

[Forevrbumpn]

but also at Fs if the box is tuned to the Fs, that is when the speaker will have the least excursion- when a speaker is playing the tuning point of the box, the speaker barely even moves

Me personally, I go for porting a box @ fs due to the speakers natural ability for peak xmax, electrical factors. The sub would usually play best at fs, but there are also other variables.